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Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2012	Mar. 28, 2013	Jun. 30, 2012
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	GLDD
Entity Registrant Name	Great Lakes Dredge & Dock CORP
Entity Central Index Key	0001372020
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		59,366,430
Entity Public Float			$ 403,307,145
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 24,440	$ 113,288
Accounts receivable—net	149,142	120,268
Contract revenues in excess of billings	69,574	26,412
Inventories	28,726	33,426
Prepaid expenses	9,554	3,979
Other current assets	32,254	28,405
Total current assets	313,690	325,778
PROPERTY AND EQUIPMENT—Net	346,540	310,520
GOODWILL	100,799	98,049
GOODWILL AND OTHER INTANGIBLE	3,232	814
INVENTORIES—Noncurrent	37,392	30,103
INVESTMENTS IN JOINT VENTURES	7,047	6,923
OTHER	17,695	16,273
TOTAL	826,395	788,460
CURRENT LIABILITIES:
Accounts payable	123,082	82,745
Accrued expenses	38,490	31,121
Billings in excess of contract revenues	11,280	13,627
Current portion of long term debt	13,098	3,033
Total current liabilities	185,950	130,526
LONG TERM NOTE PAYABLE		2,500
7 3/8% SENIOR NOTES	250,000	250,000
DEFERRED INCOME TAXES	106,767	104,352
OTHER	10,253	8,545
Total liabilities	552,970	495,923
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 59,359 and 58,999 shares issued and outstanding at December 31, 2012 and December 31, 2011, respectively.	6	6
Additional paid-in capital	271,418	267,918
Retained earnings	2,591	24,042
Accumulated other comprehensive income (loss)	(380)	3
Total Great Lakes Dredge & Dock Corporation equity	273,635	291,969
NONCONTROLLING INTERESTS	(210)	568
Total equity	273,425	292,537
TOTAL	$ 826,395	$ 788,460

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	59,359,000	58,999,000
Common stock, shares outstanding	59,359,000	58,999,000

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Operations [Abstract]
CONTRACT REVENUES	$ 687,584	$ 627,333	$ 686,922
COSTS OF CONTRACT REVENUES	619,185	534,316	564,140
GROSS PROFIT	68,399	93,017	122,782
OPERATING EXPENSES:
GENERAL AND ADMINISTRATIVE EXPENSES	53,459	50,434	54,352
GAIN ON SALE OF ASSETS—Net	(565)	(11,711)
Total operating income	15,505	54,294	68,430
OTHER EXPENSE:
Interest expense—net	(20,922)	(21,665)	(13,542)
Equity in earnings (loss) of joint ventures	124	(406)	(614)
Loss on foreign currency transactions—net	(118)	(282)
Loss on extinguishment of debt		(5,145)
Total other expense	(20,916)	(27,498)	(14,156)
INCOME BEFORE INCOME TAXES	(5,411)	26,796	54,274
INCOME TAX PROVISION	2,071	(9,545)	(20,554)
NET INCOME	(3,340)	17,251	33,720
Net (income) loss attributable to noncontrolling interests	645	(723)	889
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	$ (2,695)	$ 16,528	$ 34,609
Basic earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ (0.05)	$ 0.28	$ 0.59
Basic weighted average shares	59,195	58,891	58,647
Diluted earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ (0.05)	$ 0.28	$ 0.59
Diluted weighted average shares	59,195	59,230	58,871

Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Consolidated Statements Of Comprehensive Income [Abstract]

Net income

$ (3,340)

$ 17,251

$ 33,720

Currency translation adjustment—net of tax

^[1]

(6)

(267)

Reclassification of derivative gains (losses) to earnings—net of tax

^[2]

(1,437)

(321)

Change in fair value of derivatives—net of tax

^[3]

(380)

1,350

139

Other comprehensive loss—net of tax

(383)

(354)

(182)

Comprehensive income

(3,723)

16,897

33,538

Comprehensive (income) loss attributable to noncontrolling interests

645

(723)

889

Comprehensive income attributable to Great Lakes Dredge & Dock Corporation

$ (3,078)

$ 16,174

$ 34,427

[1]	Net of income tax (provision) benefit of $(7), $(177) and $0 for the years ended December 31, 2012, 2011 and 2010, respectively
[2]	Net of income tax (provision) benefit of $2, $(882) and $(213) for the years ended December 31, 2012, 2011 and 2010, respectively.
[3]	Net of income tax (provision) benefit of $(252), $824 and $92 for the years ended December 31, 2012, 2011 and 2010, respectively

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

Amount after tax, before reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

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- Definition

Net of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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- Definition

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ (7)	$ (177)	$ 0
Reclassification of derivative gains to earnings, tax	2	(882)	(231)
Change in fair value of derivatives, tax	$ (252)	$ 824	$ 92

- Definition

Amount of tax effect, net of reclassification adjustments, on the result from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency.

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- Definition

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

+ References + Details

Consolidated Statements Of Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss)[Member]	Noncontrolling Interests [Member]	Total
BALANCE - value at Dec. 31, 2009	$ 6	$ 263,579	$ (18,336)	$ 539	$ (1,239)	$ 244,549
BALANCE - shares at Dec. 31, 2009	58,542
Share-based compensation, Value		2,094				2,094
Share-based compensation, Shares	79
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	13
Exercise of stock options, Value		656				656
Exercise of stock options, Shares	136
Dividends declared and paid			(3,988)			(3,988)
Dividend equivalents paid on restricted stock units			24			24
Net income			34,609		(889)	33,720
Other comprehensive loss—net of tax				(182)		(182)
BALANCE - value at Dec. 31, 2010	$ 6	266,329	12,261	357	(2,128)	276,825
BALANCE - shares at Dec. 31, 2010	58,770
Share-based compensation, Value		1,838				1,838
Share-based compensation, Shares	116
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(291)				(291)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	106
Exercise of stock options, Value		27				27
Exercise of stock options, Shares	6
Excess income tax benefit from share based compensation		55				55
Dividends declared and paid			(4,711)			(4,711)
Dividend equivalents paid on restricted stock units			(36)			(36)
Acquisition of noncontrolling interest in NASDI, LLC		(40)			1,973	1,933
Net income			16,528		723	17,251
Other comprehensive loss—net of tax				(354)		(354)
BALANCE - value at Dec. 31, 2011	$ 6	267,918	24,042	3	568	292,537
BALANCE - shares at Dec. 31, 2011	58,999
Share-based compensation, Value		3,081				3,081
Share-based compensation, Shares	165
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(231)				(231)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	92
Exercise of stock options, Value		461				$ 461
Exercise of stock options, Shares	103					102
Excess income tax benefit from share based compensation		189				$ 189
Dividends declared and paid			(18,560)			(18,560)
Dividend equivalents paid on restricted stock units			(196)			(196)
Net income			(2,695)		(645)	(3,340)
Other comprehensive loss—net of tax				(383)		(383)
BALANCE - value at Dec. 31, 2012	$ 6	$ 271,418	$ 2,591	$ (380)	(210)	273,425
BALANCE - shares at Dec. 31, 2012	59,359
Distributions paid to noncontrolling interests					$ (133)	$ (133)

Consolidated Statements Of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Equity [Abstract]
Dividends declared per share	$ 0.07	$ 0.08	$ 0.31

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES:
Net income	$ (3,340)	$ 17,251	$ 33,720
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	40,034	40,838	34,301
Equity in (earnings) loss of joint ventures	(124)	406	614
Loss on extinguishment of 7 3/4% senior subordinated notes		5,145
Deferred income taxes	3,100	14,332	7,405
Gain on dispositions of property and equipment	(532)	(11,711)	(505)
Gain on adjustment of contingent earnout	(240)	(1,400)
Amortization of deferred financing fees	1,245	1,515	1,607
Unrealized foreign currency loss	208	513
Share-based compensation expense	3,081	1,838	2,094
Excess income tax benefit from share based compensation	(189)	(55)
Changes in assets and liabilities:
Accounts receivable	(16,597)	(25,659)	56,603
Contract revenues in excess of billings	(40,273)	(3,759)	3,510
Inventories	(2,869)	(4,667)	2,630
Prepaid expenses and other current assets	(7,935)	(12,340)	(847)
Accounts payable and accrued expenses	24,633	3,888	(5,053)
Billings in excess of contract revenues	(2,398)	(857)	(11,078)
Other noncurrent assets and liabilities	336	(715)	(1,470)
Net cash flows provided by (used in) by operating activities	(1,860)	24,563	123,531
INVESTING ACTIVITIES:
Purchases of property and equipment	(62,485)	(33,433)	(25,258)
Proceeds from dispositions of property and equipment	1,042	16,717	431
Acquisition of Terra assets	(2,000)
Acquisition of Matteson assets			(37,869)
Net cash flows used in investing activities	(63,443)	(16,716)	(62,696)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,962)
Repayment of long term note payable	(2,500)	(2,500)
Distributions paid to minority interests	(133)
Dividends paid	(18,560)	(4,711)	(3,988)
Dividend equivalents paid on restricted stock units	(196)	(36)	(24)
Taxes paid on settlement of vested share awards	(231)	(291)
Repayments of equipment debt	(543)	(1,911)	(1,251)
Exercise of stock options	461	27	656
Excess income tax benefit from share-based compensation	189	55
Borrowings under revolving loans			14,968
Repayments of revolving loans			(25,968)
Net cash flows provided by (used in) financing activities	(23,552)	57,407	(15,607)
Effect of foreign currency exchange rates on cash and cash equivalents	7	(444)
Net increase (decrease) in cash and cash equivalents	(88,848)	64,810	45,228
Cash and cash equivalents at beginning of period	113,288	48,478	3,250
Cash and cash equivalents at end of period	24,440	113,288	48,478
Supplemental Cash Flow Information
Cash paid for interest	19,462	12,485	13,269
Cash paid (refunded) for income taxes	(4,859)	5,270	16,332
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	7,747	5,222	8,559
Property and equipment purchased on capital leases and equipment notes		2,127	109
NASDI, LLC [Member]
Non-cash Investing and Financing Activities
Acquisition of noncontrolling interest in NASDI, LLC		$ 40
Matteson [Member]
Non-cash Investing and Financing Activities
Purchase price of assets comprised of promissory notes and other liabilities			$ 9,140
Terra [Member]
Non-cash Investing and Financing Activities
Purchase price of assets comprised of promissory notes and other liabilities	$ 23,798

Nature Of Business And Summary Of Signicant Accounting Policies

12 Months Ended

Dec. 31, 2012

Nature Of Business And Summary Of Significant Accounting Policies [Abstract]

Nature Of Business And Summary Of Significant Accounting Policies

NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization —Great Lakes Dredge & Dock Corporation and its subsidiaries (the “Company” or “Great Lakes”) are in the business of marine construction, primarily dredging, and commercial and industrial demolition. The Company’s primary dredging customers are domestic and foreign government agencies, as well as private entities, and its primary demolition customers are general contractors, corporations that commission projects, nonprofit institutions such as universities and hospitals, and local government and municipal agencies.

Principles of Consolidation and Basis of Presentation —The consolidated financial statements include the accounts of Great Lakes Dredge & Dock Corporation and its majority-owned subsidiaries. All intercompany accounts and transactions are eliminated in consolidation. The equity method of accounting is used for investments in unconsolidated investees in which the Company has significant influence, but not control. Other investments, if any, are carried at cost.

Use of Estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect certain reported amounts and disclosures. Accordingly, actual results could differ from those estimates.

Revenue and Cost Recognition on Contracts —Substantially all of the Company’s contracts for dredging services are fixed-price contracts, which provide for remeasurement based on actual quantities dredged. The majority of the Company’s demolition contracts are also fixed-price contracts, with others managed as time-and-materials. Contract revenues are recognized under the percentage-of-completion method, based on the Company’s engineering estimates of the physical percentage completed for dredging projects and using a cost-to-cost approach for demolition projects. For dredging projects, costs of contract revenues are adjusted to reflect the gross profit percentage expected to be achieved upon ultimate completion. For demolition contracts, contract revenues are adjusted to reflect the estimated gross profit percentage. Revisions in estimated gross profit percentages are recorded in the period during which the change in circumstances is experienced or becomes known. As the duration of most of the Company’s contracts is one year or less, the cumulative net impact of these revisions in estimates, individually and in the aggregate across our projects, does not significantly affect our results across reporting periods. Provisions for estimated losses on contracts in progress are made in the period in which such losses are determined. Change orders are not recognized in revenue until the recovery is probable and collectability is reasonably assured. Claims for additional compensation due to the Company are not recognized in contract revenues until such claims are settled. Billings on contracts are generally submitted after verification with the customers of physical progress and may not match the timing of revenue recognition. The difference between amounts billed and recognized as revenue is reflected in the balance sheet as either contract revenues in excess of billings or billings in excess of contract revenues. Modifications may be negotiated when a change from the original contract specification is encountered, and a change in project scope, performance methodology and/or material disposal is necessary. Thus, the resulting modification is considered a change in the scope of the original project to which it relates. Significant expenditures incurred incidental to major contracts are deferred and recognized as contract costs based on contract performance over the duration of the related project. These expenditures are reported as prepaid expenses.

The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel and project overhead. Hourly labor is generally hired on a project-by-project basis. Costs of contract revenues vary significantly depending on the type and location of work performed and assets utilized. Generally, capital projects have the highest margins due to the complexity of the projects, while coastal protection projects have the most volatile margins because they are most often exposed to variability in weather conditions.

The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. These costs have averaged approximately 21% to 25% of total costs of contract revenues over the prior three years. During the year, both equipment utilization and the timing of fixed cost expenditures fluctuate significantly. Accordingly, the Company allocates these fixed equipment costs to interim periods in proportion to revenues recognized over the year, to better match revenues and expenses. Specifically, at each interim reporting date the Company compares actual revenues earned to date on its dredging contracts to expected annual revenues and recognizes equipment costs on the same proportionate basis. In the fourth quarter, any over or under allocated equipment costs are recognized such that the expense for the year equals actual equipment costs incurred during the year.

Classification of Current Assets and Liabilities —The Company includes in current assets and liabilities amounts realizable and payable in the normal course of contract completion, unless completion of such contracts extends significantly beyond one year.

Cash Equivalents —The Company considers all highly liquid investments with a maturity at purchase of three months or less to be cash equivalents.

Accounts Receivable, net —Accounts receivable represent amounts due or billable under the terms of contracts with customers, including amounts related to retainage. The Company anticipates collection of retainage generally within one year, and accordingly presents retainage as a current asset. A portion of retainage will not be collected until after one year and is classified as other non-current assets. The Company provides an allowance for estimated uncollectible accounts receivable when events or conditions indicate that amounts outstanding are not recoverable.

Inventories —Inventories consist of pipe and spare parts used in the Company’s dredging operations. Pipe and spare parts are purchased in large quantities; therefore, a certain amount of pipe and spare part inventories is not anticipated to be used within the current year and is classified as long-term. Inventories are stated at the lower of net realizable value or weighted average historical cost.

Property and Equipment —Capital additions, improvements, and major renewals are classified as property and equipment and are carried at depreciated cost. Maintenance and repairs that do not significantly extend the useful lives of the assets or enhance the capabilities of such assets are charged to expenses as incurred. Depreciation is recorded over the estimated useful lives of property and equipment using the straight-line method and the mid-year depreciation convention. The estimated useful lives by class of assets are:


Class		Useful Life (years)
Buildings and improvements		10
Furniture and fixtures		5-10
Vehicles, dozers, and other light operating equipment and systems		3-5
Heavy operating equipment (dredges and barges)		10-30

Leasehold improvements are amortized over the shorter of their remaining useful lives or the remaining terms of the leases.

Goodwill and Other Intangible Assets —Goodwill represents the excess of acquisition cost over fair value of the net assets acquired. Other identifiable intangible assets mainly represent developed technology and databases, customer relationships, and customer contracts acquired in business combinations and are being amortized over a one to five-year period. Goodwill is tested annually for impairment in the third quarter of each year, or more frequently should circumstances dictate. GAAP requires that goodwill of a reporting unit be tested for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount.

The Company assesses the fair values of its reporting units using both a market-based approach and an income-based approach. Under the income approach, the fair value of the reporting unit is based on the present value of estimated future cash flows. The income approach is dependent on a number of factors, including estimates of future market growth trends, forecasted revenues and expenses, appropriate discount rates and other variables. The estimates are based on assumptions that the Company believes to be reasonable, but such assumptions are subject to unpredictability and uncertainty. Changes in these estimates and assumptions could materially affect the determination of fair value, and may result in the impairment of goodwill in the event that actual results differ from those estimates.

The market approach measures the value of a reporting unit through comparison to comparable companies. Under the market approach, the Company uses the guideline public company method by applying estimated market-based enterprise value multiples to the reporting unit’s estimated revenue and Adjusted EBITDA. The Company analyzed companies that performed similar services or are considered peers. Due to the fact that there are no public companies that are direct competitors, the Company weighed the results of this approach less than the income approach.

At year end the Company operates in four operating segments that, through aggregation, comprise two reportable segments: dredging and demolition. Four operating segments were aggregated into two reportable segments as the segments have similarity in economic margins, services, production processes, customer types, distribution methods and regulatory environment. The Company has determined that the operating segments are the Company’s four reporting units. Prior to the re-evaluation of segments at year end, the Company had two reportable segments that were the operating segments and the reporting units. The Company performed its most recent annual test of impairment as of July 1, 2012 for the goodwill in both the dredging and demolition segments with no indication of goodwill impairment as of the test date. As of the test date, the fair value of both the dredging segment and the demolition segment were in excess of their carrying values by at least 35%. No test was performed in the fourth quarter as based on the segments’ current forecasts no triggering events which would require an interim test were deemed to have occurred. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2013 should no triggering events occur which would require a test prior to the next annual test.

Long-Lived Assets —Long-lived assets are comprised of property and equipment and intangible assets subject to amortization. Long-lived assets to be held and used are reviewed for possible impairment whenever events indicate that the carrying amount of such assets may not be recoverable by comparing the undiscounted cash flows associated with the assets to their carrying amounts. If such a review indicates an impairment, the carrying amount would be reduced to fair value. If long-lived assets are to be disposed, depreciation is discontinued, if applicable, and the assets are reclassified as held for sale at the lower of their carrying amounts or fair values less estimated costs to sell. No triggering events were identified in 2012 or 2011.

The Company capitalizes construction in progress and records a corresponding long-term liability for build-to-suit lease agreements where we are considered the owner during the construction period for accounting purposes.

Self-insurance Reserves —The Company self-insures costs associated with its seagoing employees covered by the provisions of Jones Act, workers’ compensation claims, hull and equipment liability, and general business liabilities up to certain limits. Insurance reserves are established for estimates of the loss that the Company may ultimately incur on reported claims, as well as estimates of claims that have been incurred but not yet reported. In determining its estimates, the Company considers historical loss experience and judgments about the present and expected levels of cost per claim. Trends in actual experience are a significant factor in the determination of such reserves.

The Company was previously a member of an insurance association that provided personal injury coverage for its maritime workforce in excess of self-insurance retention limits. Under the prior plan the Company was subject to retroactive premium adjustments based on the association’s claims experience and investment performance. The Company accrued for retroactive premium adjustments when assessed by the insurance association. As the Company is no longer a member of the insurance association, there were no assessments accrued for the year ended December 31, 2012 and 2011.

Income Taxes —The provision for income taxes includes federal, foreign, and state income taxes currently payable and those deferred because of temporary differences between the financial statement and tax basis of assets and liabilities. Recorded deferred income tax assets and liabilities are based on the estimated future tax effects of differences between the financial and tax basis of assets and liabilities, given the effect of currently enacted tax laws. The Company’s current policy is to repatriate all earnings from foreign subsidiaries’ operations as generated and at this time no amounts are considered to be permanently reinvested in those operations.

Hedging Instruments —The Company designates certain derivative contracts as a cash flow hedge as defined by GAAP. Accordingly, the Company formally documents, at the inception of each hedge, all relationships between hedging instruments and hedged items, as well as our risk-management objective and strategy for undertaking hedge transactions. This process includes linking all derivatives to highly-probable forecasted transactions.

The Company formally assesses, at inception and on an ongoing basis, the effectiveness of hedges in offsetting changes in the cash flows of hedged items. Hedge accounting treatment is discontinued when (1) it is determined that the derivative is no longer highly effective in offsetting changes in the cash flows of a hedged item (including hedged items for forecasted future transactions), (2) the derivative expires or is sold, terminated or exercised, (3) it is no longer probable that the forecasted transaction will occur or (4) management determines that designating the derivative as a hedging instrument is no longer appropriate. If management elects to stop hedge accounting, it would be on a prospective basis and any hedges in place would be recognized in accumulated other comprehensive income (loss) until all the related forecasted transactions are completed or are probable of not occurring.

Foreign Currency Translation —The financial statements of the Company’s foreign subsidiaries where the operations are primarily denominated in the foreign currency are translated into U.S. dollars for reporting. Balance sheet accounts are translated at the current foreign exchange rate at the end of each period and income statement accounts are translated at the average foreign exchange rate for each period. Gains and losses on foreign currency translations are reflected as a currency translation adjustment, net of tax, in accumulated other comprehensive income (loss). Foreign currency transaction gains and losses are included in loss on foreign currency transactions, net.

Noncontrolling Interest —The Company previously owned 65% of the profits interests of NASDI, LLC (“NASDI”), a demolition service provider located in the Boston, Massachusetts area. Effective January 1, 2011 the Company reacquired Mr. Christopher Berardi’s 35% membership interest in NASDI for no cost per the terms of NASDI’s limited liability company agreement. This resulted in the elimination of noncontrolling interest of $1,973 in 2011. The Company now owns 100% of NASDI.

In March 2011, Mr. Berardi resigned his employment with the Company’s demolition segment effective April 29, 2011. Mr. Berardi’s resignation and the repurchase of his NASDI membership interest also resulted in the reversal of a $1,933 accrual in 2011 established in conjunction with a prior restructuring of ownership interest in NASDI. This reversal was recorded directly to equity as part of the reacquisition of the noncontrolling interest.

On January 1, 2009 the Company acquired a 65% interest in Yankee Environmental Services, LLC (“Yankee”). Noncontrolling interest at December 31, 2012 is related to the membership interest the Company does not own in Yankee.

Earnings Per Share —Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings per share is computed similar to basic earnings per share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. For the year ended December 31, 2012, 478 shares of potentially dilutive stock options to purchase shares of common stock (“NQSO”) and restricted stock units (“RSU”) were excluded from the diluted weighted-average common shares outstanding, as the Company incurred a loss during this period. For the years ended 2011 and 2010, 299 and zero NQSOs, respectively, were excluded from the calculation of diluted earnings per share. The options were excluded based on the application of the treasury stock method, as such options were determined to be anti-dilutive.

The computations for basic and diluted earnings per share for the years ended December 31, 2012, 2011 and 2010 are as follows:



(shares in thousands)
	2012		2011		2010
Net income (loss) attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	(2,695)	$	16,528	$	34,609

Weighted-average common shares outstanding — basic		59,195		58,891		58,647
Effect of stock options and restricted stock units		-		339		224

Weighted-average common shares outstanding — diluted		59,195		59,230		58,871

Earnings (loss) per share — basic	$	(0.05)	$	0.28	$	0.59
Earnings (loss) per share — diluted	$	(0.05)	$	0.28	$	0.59

Restricted And Escrowed Cash

12 Months Ended

Dec. 31, 2012

Restricted And Escrowed Cash [Abstract]

Restricted And Escrowed Cash


	2.	RESTRICTED AND ESCROWED CASH

At December 31, 2012 and 2011, other noncurrent assets include $1,500 of cash held in escrow as security for the Company’s lease rental obligation under a long-term equipment operating lease.

At December 31, 2012, other current assets include $450 of cash held in escrow related to an outstanding lawsuit.

At December 31, 2011 the Company held cash and cash equivalents of $6,489 in an escrow account related to its sale of real estate in Channelview, TX. The escrow was used to transfer the proceeds from the sale to the purchase of a like-kind property, and due to the availability of the funds to the Company were not deemed to be restricted.

- Definition

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7
-Footnote 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H
-Subsection 3

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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-Paragraph 1
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9, 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Accounts Receivable And Contracts In Progress

12 Months Ended

Dec. 31, 2012

Accounts Receivable And Contracts In Progress [Abstract]

Accounts Receivables And Contracts In Progress

3. ACCOUNTS RECEIVABLE AND CONTRACTS IN PROGRESS

Accounts receivable at December 31, 2012 and 2011 are as follows:



	2012		2011
Completed contracts	$	43,898	$	38,317
Contracts in progress		91,459		69,469
Retainage		24,419		20,692
		159,776		128,478
Allowance for doubtful accounts		(2,050)		(1,839)

Total accounts receivable—net	$	157,726	$	126,639

Current portion of accounts receivable—net	$	149,142	$	120,268
Long-term accounts receivable and retainage		8,584		6,371
Total accounts receivable—net	$	157,726	$	126,639

The components of contracts in progress at December 31, 2012 and 2011 are as follows:



	2012		2011
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	458,750	$	173,187
Amounts billed		(392,860)		(152,045)
Costs and earnings in excess of billings for contracts in progress		65,890		21,142

Costs and earnings in excess of billings for completed contracts		3,684		7,459

Total contract revenues in excess of billings	$	69,574	$	28,601

Current portion of contract revenues in excess of billings	$	69,574	$	26,412
Portion included in other noncurrent assets		-		2,189
Total contract revenues in excess of billings	$	69,574	$	28,601

Billings in excess of costs and earnings:
Amounts billed	$	(338,741)	$	(427,797)
Costs and earnings for contracts in progress		327,461		414,170

Total billings in excess of contract revenues	$	(11,280)	$	(13,627)

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524

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-Name Accounting Standards Codification
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-Paragraph 13
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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+ Details

Property And Equipment

12 Months Ended

Dec. 31, 2012

Property And Equipment [Abstract]

Property And Equipment

PROPERTY AND EQUIPMENT

Property and equipment at December 31, 2012 and 2011 are as follows:



	2012		2011

Land	$	9,205	$	2,764
Buildings and improvements		5,184		5,184
Furniture and fixtures		4,585		3,636
Operating equipment		563,101		519,008
Construction in progress on build-to-suit vessels		10,415		-

Total property and equipment		592,490		530,592

Accumulated depreciation		(245,950)		(220,072)

Property and equipment — net	$	346,540	$	310,520

Depreciation expense was $39,781, $38,372 and $33,874, for the years ended December 31, 2012, 2011 and 2010, respectively.

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Goodwill And Other Intangible Assets

12 Months Ended

Dec. 31, 2012

Goodwill And Other Intangible Assets [Abstract]

Goodwill And Other Intangible Assets


	5.	GOODWILL AND OTHER INTANGIBLE ASSETS

The change in the carrying amount of goodwill during the years ended December 31, 2012 and 2011 is as follows:



	Dredging Segment		Demolition Segment		Total

Balance - January 1, 2011	$	76,575	$	21,474	$	98,049
		-		-		-

Balance - December 31, 2011		76,575		21,474		98,049
Acquisition of Terra Contracting		-		2,750		2,750

Balance - December 31, 2012	$	76,575	$	24,224	$	100,799


Goodwill	$	76,575	$	29,040	$	105,615

Accumulated Impairment Loss		-		(4,816)		(4,816)

Balance - December 31, 2012	$	76,575	$	24,224	$	100,799

At December 31, 2012 and 2011, the net book value of identifiable intangible assets was as follows:



As of December 31, 2012	Cost		Accumulated Amortization		Net

Non-compete agreement	$	1,852	$	421	$	1,431
Customer relationships		1,481		1,335		146
Software and databases		1,209		1,136		73
Backlog		627		-		627
Trade names		499		70		429
Other		526		-		526

	$	6,194	$	2,962	$	3,232


As of December 31, 2011

Customer relationships	$	1,481	$	1,279	$	202
Software and databases		1,209		1,063		146
Non-compete agreement		744		313		431
Trade names		88		53		35

	$	3,522	$	2,708	$	814

On December 31, 2012 the Company acquired the assets of Terra Contracting, LLC. (“Terra”) resulting in the recognition of additional intangible assets and goodwill. The weighted average amortization period for intangible assets acquired in 2012 is 4.0 years.

On December 31, 2010 the Company acquired the assets of L.W. Matteson, Inc. (“Matteson”) resulting in the recognition of additional intangible assets (See Note 14). The weighted average amortization period for intangible assets acquired in 2010 is 1.8 years. Intangible assets that were fully amortized at December 31, 2011, including backlog and other intangible assets, have been removed from the balance sheet.

Amortization expense was $254, $2,466 and $427, for the years ended December 31, 2012, 2011 and 2010, respectively, and is included as a component of general and administrative expenses. Amortization expense related to intangible assets is estimated to be $1,289 in 2013, $572 in 2014, $552 in 2015, $409 in 2016 and $409 in 2017.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Accrued Expenses

12 Months Ended

Dec. 31, 2012

Accrued Expenses [Abstract]

Accrued Expenses

6. ACCRUED EXPENSES

Accrued expenses at December 31, 2012 and 2011 are as follows:



	2012		2011

Payroll and employee benefits	$	9,906	$	10,763
Insurance		9,070		8,285
Interest		7,837		7,759
Construction liabilities		6,426		-
Income and other taxes		1,699		1,261
Percentage of completion adjustment		1,552		1,855
Other		2,000		1,198
Total accrued expenses	$	38,490	$	31,121

Long-term Debt

12 Months Ended

Dec. 31, 2012

Long-Term Debt [Abstract]

Long-Term Debt

7. LONG-TERM DEBT

Long-term debt at December 31, 2012 and 2011 is as follows:




	2012		2011

Equipment notes payable	$	51	$	591
Note payable		13,047		5,000
7.375% senior notes		250,000		250,000

Subtotal		263,098		255,591

Current portion of note payable		(13,047)		(2,500)
Current portion of equipment debt		(51)		(533)

Total	$	250,000	$	252,558

Credit agreement

On June 4, 2012, the Company entered into a senior revolving credit agreement (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender and an Issuing Lender, Bank of America, N.A., as Syndication Agent and PNC Bank, National Association, BMO Harris Bank N.A. and Fifth Third Bank, as Co-Documentation Agents. The Credit Agreement, which replaced the Company’s former revolving credit agreement, provides for a senior revolving credit facility in an aggregate principal amount of up to $175,000, subfacilities for the issuance of standby letters of credit up to a $125,000 sublimit, multicurrency borrowings up to a $50,000 sublimit and swingline loans up to a $10,000 sublimit. The Credit Agreement also includes an incremental loans feature that will allow the Company to increase the senior revolving credit facility by an aggregate principal amount of up to $50,000. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, and the Company will be in pro forma compliance with the existing financial covenants both before and after giving effect to the increase, and subject to other standard conditions. The prior credit agreement with Bank of America N.A. was terminated.

Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum.

The new credit facility contains affirmative, negative and financial covenants customary for financings of this type. The Credit Agreement also contains customary events of default (including non-payment of principal or interest on any material debt and breaches of covenants) as well as events of default relating to certain actions by the Company’s surety bonding provider. The Credit Agreement requires the Company to maintain a net leverage ratio less than or equal to 4.50 to 1.00 as of the end of each fiscal quarter and a minimum fixed charge coverage ratio of 1.25 to 1.00. At December 31, 2012, the Company’s fixed charge coverage ratio was 1.12x, resulting in an event of default under the Credit Agreement.

On March 15, 2013, the Company executed a Waiver and Amendment No. 2 to the Credit Agreement (the “Credit Agreement Waiver and Amendment”) pursuant to which the counterparties thereto agreed, among other things, to waive any default, event of default, or possible event of default, as applicable, related to the Company’s failure to meet the above-described financial covenant in the Credit Agreement.

Separately, the Company determined that a perfection trigger event had occurred under the Credit Agreement. As a result, the outstanding obligations under the Credit Agreement, which were previously unsecured, are now secured by liens on certain of the Company’s vessels and all of its domestic accounts receivable, subject to the liens and interests of certain other parties holding first priority perfected liens. Under the original terms of the Credit Agreement, the obligations thereunder that became secured under these circumstances could again become unsecured provided that (i) no event of default has occurred and is continuing and (ii) the Company has maintained for two consecutive quarters, and is projected to maintain for the next two consecutive quarters, a total leverage ratio less than or equal to 3.75 to 1.0. Pursuant to the Credit Agreement Waiver and Amendment, this provision has been amended to add the additional condition that no release of the liens securing the obligations under the Credit Agreement can occur until the Company has delivered to the lenders its audited financial statements with respect to its fiscal year ending December 31, 2013.

The obligations of Great Lakes under the Credit Agreement are unconditionally guaranteed, on a joint and several basis, by each existing and subsequently acquired or formed material direct and indirect domestic subsidiary of the Company. As of December 31, 2012, the Company had no borrowings and $35,663 of letters of credit outstanding, resulting in $139,337 of availability under the Credit Agreement. On March 13, 2013, Zurich American Insurance Company informed the Company that it intends to seek, pursuant to the existing surety arrangements among the Company, Zurich and the administrative agent under the Credit Agreement, second mortgages on the same vessels securing the Company’s obligations under the Credit Agreement.

Senior notes

In January 2011, the Company issued $250,000 of 7.375% senior notes due February 1, 2019. The senior notes were issued at 100% of face value resulting in net proceeds of $244,171. Also in January 2011, the Company redeemed all of its $175,000 of 7.75% senior subordinated notes due December 2013 for $180,014, which included a redemption premium and accrued and unpaid interest. The net proceeds of the issuance of the senior notes were used to redeem the senior subordinated notes. The remaining net proceeds from the issuance of the senior notes were used to augment working capital and could be used in the future for acquisitions.

Other

Great Lakes has a $24,000 International Letter of Credit Facility with Wells Fargo Bank, National Association, as successor by merger to Wells Fargo HSBC Trade Bank. This facility is used for performance and advance payment guarantees on foreign contracts, including our long-term land reclamation project in Bahrain. The Company’s obligations under the agreement are guaranteed by the Company’s foreign accounts receivable. In addition, the Export-Import Bank of the United States (“Ex-Im Bank”) has issued a guarantee under the Ex-Im Bank’s Working Capital Guarantee Program, which covers 90% of the obligations owing under the facility. At December 31, 2012, there were no letters of credit outstanding under this facility. At December 31, 2012, the Company also failed to the meet the International Letter of Credit Facility’s requirement of maintaining a minimum fixed charge coverage ratio of 1.25 to 1.0. On March 15, 2013, the Company executed a Waiver to the International Letter of Credit Facility (the “LC Waiver”) pursuant to which the counterparties thereto agreed, among other things, to waive any default, event of default, or possible event of default, as applicable, related to the Company’s failure to meet the above-described financial covenant in the Credit Agreement and the International Letter of Credit Facility.

In accordance with the purchase of Matteson (See Note 14), the Company issued a secured promissory note in the amount of $7,500 to the former owners of Matteson. The remaining principal payment of $2,500 is due on December 31, 2013. Interest payments at the annual rate of 6% are due quarterly.

In accordance with the purchase of certain assets of Terra (See Note 14), the Company issued a secured promissory note in the amount of $10,547 to the former owner of Terra. The balance of the note of $10,547 was paid in January 2013.

The scheduled principal payments through the maturity date of the Company’s long-term debt, excluding equipment notes, at December 31, 2012, are as follows:



Years Ending December 31

2013	$	13,047
2014		-
2015		-
2016		-
2017		-
Thereafter		250,000

Total	$	263,047

The Company incurred amortization of deferred financing fees for its long term debt of $1,245, $1,515 and $1,607 for each of the years ended December 31, 2012, 2011 and 2010. Such amortization is recorded as a component of interest expense.

The Company sometimes enters into equipment note arrangements or capital leases to finance the acquisition of dozers, excavators and other operating equipment. In 2011, the Company entered into equipment notes totaling $2,127. There were no equipment note arrangements or capital leases entered into in 2012. The current portion of equipment notes payable is $51 and $533, at December 31, 2012 and 2011, respectively. The long-term portion of these equipment notes is included in other long-term liabilities and totaled $58 at December 31, 2011. There is no long-term portion of equipment notes at December 31, 2012. The terms of these equipment notes extend through 2013. The net book value of the related assets was $190 and $2,450 at December 31, 2012 and 2011, respectively. Payments on these equipment notes will be $51 in 2013.

Fair Value Measurements

12 Months Ended

Dec. 31, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

8. FAIR VALUE MEASUREMENTS

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A fair value hierarchy has been established by GAAP that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The accounting guidance describes three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. At December 31, 2012 and 2011, the Company held certain derivative contracts that it uses to manage foreign currency risk, commodity price risk and interest rate risk. The Company does not hold or issue derivatives for speculative or trading purposes. The fair values of these financial instruments are summarized as follows:


				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Liabilities
Fuel hedge contracts	$	178	$	-	$	178	$	-

				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	449	$	-	$	449	$	-
Interest rate swap contracts		755		-		755		-
Foreign exchange contracts		155		-		155		-
Total assets measured at fair value	$	1,359	$	-	$	1,359	$	-

Interest rate swap contracts

In May 2009, the Company entered into two interest rate swap arrangements, which were effective through December 15, 2012, to swap a notional amount of $50 million from a fixed rate of 7.75% to a floating LIBOR-based rate in order to manage the interest rate paid with respect to the Company’s 7.75% senior subordinated notes. Although the senior subordinated notes were redeemed in January 2011, the swaps remained in place. The swaps were not accounted for as a hedge; therefore, the changes in fair value were recorded as adjustments to interest expense in each reporting period. The swaps expired and were settled in December 2012.

The Company previously verified the fair value of the interest rate swap contracts using a quantitative model that contained both observable and unobservable inputs. The unobservable inputs related primarily to the implied LIBOR forward rate and the long-term nature of the contracts. As of December 31, 2011 the unobservable inputs began to be corroborated by observable market data and accordingly the Company transferred the swaps into Level 2 of the fair value hierarchy. The change in Level 3 interest rate swap contracts during the prior year was as follows:


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2011
Interest rate swap contracts
Balance at January 1	$	1,264
Total unrealized gains (losses) included in earnings		(1,396)
Settlements		887
Transfers out of Level 3		(755)
Balance at December 31	$	-

Foreign exchange contracts

The Company has various exposures to foreign currencies that fluctuate in relation to the U.S. dollar. The Company periodically enters into foreign exchange forward contracts to hedge this risk. At December 31, 2012 there were no outstanding contracts and at December 31, 2011 the Company had one outstanding contract related to the Brazilian Real. This foreign exchange contract was not accounted for as a hedge.

Fuel hedge contracts

The Company is exposed to certain market risks, primarily commodity price risk as it relates to the diesel fuel purchase requirements, which occur in the normal course of business. The Company enters into heating oil commodity swap contracts to hedge the risk that fluctuations in diesel fuel prices will have an adverse impact on cash flows associated with its domestic dredging contracts. The Company’s goal is to hedge approximately 80% of the fuel requirements for work in backlog.

As of December 31, 2012, the Company was party to various swap arrangements to hedge the price of a portion of its diesel fuel purchase requirements for work in its backlog to be performed through May 2013. As of December 31, 2012, there were 2.8 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted fuel purchases through May 2013. Under these swap agreements, the Company will pay fixed prices ranging from $3.01 to $3.29 per gallon.

At each balance sheet date, unrealized gains and losses on fuel hedge contracts are recorded as a component of accumulated other comprehensive income (loss) in the consolidated balance sheets. Gains and losses realized upon settlement of fuel hedge contracts are reclassified from accumulated other comprehensive income (loss) as the fuel is utilized and included in fuel expense, which is a component of costs of contract revenues in the consolidated statements of operations.

At December 31, 2012, the fair value liability of the fuel hedge contracts was estimated to be $178 and is recorded in accrued expenses. At December 31, 2011, the fair value asset of the fuel hedge contracts was estimated to be $449 and was recorded in other current assets. The loss reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the year ended December 31, 2012 was $3. The remaining gains and losses included in accumulated other comprehensive income (loss) at December 31, 2012 will be reclassified into earnings over the next five months, corresponding to the period during which the hedged fuel is expected to be utilized. The fair values of fuel hedges are corroborated using inputs that are readily observable in public markets; therefore, the Company determines fair value of these fuel hedges using Level 2 inputs.

The Company is exposed to counterparty credit risk associated with non-performance of its various derivative instruments. The Company’s risk would be limited to any unrealized gains on current positions. To help mitigate this risk, the Company transacts only with counterparties that are rated as investment grade or higher. In addition, all counterparties are monitored on a continuous basis.

The fair value of the foreign exchange contracts, interest rate and fuel hedge contracts outstanding as of December 31, 2012 and 2011 is as follows:


	Balance Sheet Location	Fair Value at December 31,
Asset derivatives:		2012		2011
Derivatives designated as hedges
Fuel hedge contracts	Other current assets	$	-	$	449
Derivatives not designated as hedges
Interest rate swaps	Other current assets		-		755
Foreign exchange contracts	Other current assets		-		155
Total asset derivatives		$	-	$	1,359

Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	178	$	-

Other financial instruments

The carrying value of financial instruments included in current assets and current liabilities approximates fair value due to the short-term maturities of these instruments. In January 2011, the Company issued $250,000 of 7.375% senior notes due February 1, 2019, which were outstanding at December 31, 2012 (See Note 7). The senior notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the senior notes. The fair value of the senior notes was $268,125 at December 31, 2012, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Income Taxes


	9.	INCOME TAXES

The Company’s pre- tax income (loss) from domestic and foreign operations for the years ended December 31, 2012, 2011 and 2010 is as follows:


	2012		2011		2010

Domestic operations	$	(1,212)	$	21,590	$	56,333
Foreign operations		(4,199)		5,206		(2,059)
Total pre-tax income (loss)	$	(5,411)	$	26,796	$	54,274

The provision (benefit) for income taxes as of December 31, 2012, 2011 and 2010 is as follows:


	2012		2011		2010

Federal:
Current	$	(5,226)	$	(5,657)	$	11,602
Deferred		1,696		13,762		6,772
State:
Current		201		403		2,431
Deferred		(717)		700		(602)
Foreign:
Current		-		337		351
Deferred		1,975		-		-
Total	$	(2,071)	$	9,545	$	20,554

The Company’s income tax provision reconciles to the provision at the statutory U.S. federal income tax rate of 35% as of December 31, 2012, 2011 and 2010 as follows:


	2012		2011		2010

Tax provision (benefit) at statutory U.S. federal
income tax rate	$	(1,894)	$	9,378	$	18,996
State income tax — net of federal income tax benefit		(1,061)		730		1,497
Foreign income tax benefit		-		(1,367)		440
Tax on (income) loss attributable to noncontrolling interests		242		(253)		268
Change in deferred state tax rate		246		-		-
Changes in unrecognized tax benefits		(137)		15		(1,215)
Changes in valuation allowance		228		1,588		59
Other		305		(546)		509

Income tax provision (benefit)	$	(2,071)	$	9,545	$	20,554

At December 31, 2012 and 2011, the Company had gross net operating loss carryforwards for state income tax purposes totaling $51,597 and $26,159, respectively. The outstanding carryforwards will expire between 2017 and 2026. At December 31, 2012 and 2011, a valuation allowance has been established for a portion of the deferred tax asset related to these state net operating loss carryforwards in the amount of $720 and $492, respectively.

The Company also has foreign gross net operating loss carryforwards of approximately $10,164 as of December 31, 2012 and 2011. The net operating losses expire between 2014 and 2031. At December 31, 2012 and 2011, a full valuation allowance has been established for the deferred tax asset of $2,632 related to foreign net operating loss carryforwards, as the Company believes it is more likely than not that the net operating loss carryforwards will not be realized.

As of December 31, 2012 and 2011, the Company had $471 and $633, respectively, in unrecognized tax benefits, the recognition of which would have an impact of $241 and $347 on the effective tax rate.

The Company does not expect that total unrecognized tax benefits will significantly increase or decrease within the next 12 months. Below is a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of each period.


	2012		2011		2010

Unrecognized tax benefits — January 1	$	633	$	630	$	2,038
Gross increases — tax positions in prior period		79		3		-
Gross increases — current period tax positions		80		-		-
Gross decreases — expirations in prior period		(321)		-		(113)
Gross decreases — tax positions in prior period		-		-		(1,015)
Settlements		-		-		(280)

Unrecognized tax benefits — December 31,	$	471	$	633	$	630

The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense. As of December 31, 2012 and 2011, the Company had approximately $148 and $196, respectively, of interest and penalties recorded.

The Company files income tax returns at the U.S. federal level and in various state and foreign jurisdictions. U.S. federal income tax years prior to 2011 are closed and no longer subject to examination. With few exceptions, the statute of limitations in state taxing jurisdictions in which the Company operates has expired for all years prior to 2008. In foreign jurisdictions in which the Company operates, years prior to 2010 are closed and are no longer subject to examination.

The Company’s deferred tax assets (liabilities) at December 31, 2012 and 2011 are as follows:


	2012		2011

Deferred tax assets:
Accrued liabilities	$	9,785	$	8,177
Tax credit carryforwards		2,366		391
Foreign NOLs		2,632		2,632
State NOLs		2,719		1,285
Investment in Yankee Environmental Services		441		-
Fuel hedges		71		-
Valuation allowance		(3,352)		(3,124)
Total deferred tax assets		14,662		9,361

Deferred tax liabilities:
Depreciation and amortization		(113,969)		(106,671)
Other liabilities		(1,975)
Investment in NASDI, LLC and Yankee Environmental Services		-		(942)
Fuel hedges		-		(179)
Total deferred tax liabilities		(115,944)		(107,792)
Net deferred tax liabilities	$	(101,282)		(98,431)

As reported in the balance sheet:
Net current deferred tax assets (included in other current assets)	$	5,485		5,921
Net noncurrent deferred tax liabilities		(106,767)		(104,352)
Net deferred tax liabilities	$	(101,282)		(98,431)

Deferred tax assets relate primarily to reserves and other liabilities for costs and expenses not currently deductible for tax purposes. Deferred tax liabilities relate primarily to the cumulative difference between book depreciation and amounts deducted for tax purposes. With the exception of certain state and foreign net operating loss carryforwards, a valuation allowance has not been recorded to reduce the balance of deferred tax assets at either December 31, 2012, or December 31, 2011, because the Company believes that it is more likely than not that the deferred income tax assets will ultimately be realized.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Share-Based Compensation

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]

Share-based compensation

10. SHARE-BASED COMPENSATION

The Company’s 2007 Long-Term Incentive Plan permits the granting of stock options, stock appreciation rights, restricted stock and restricted stock units to its employees and directors for up to 5,800 shares of common stock.

Compensation cost charged to expense related to share-based compensation arrangements was $3,081, $1,838 and $2,094, for the years ended December 31, 2012, 2011 and 2010, respectively.

Non-qualified stock options

The NQSO awards were granted with an exercise price equal to the market price of the Company’s common stock at the date of grant. The option awards generally vest in three equal annual installments commencing on the first anniversary of the grant date, and have ten year exercise periods.

The fair value of the NQSOs was determined at the grant date using a Black-Scholes option pricing model, which requires the Company to make several assumptions. The risk-free interest rate is based on the U.S. Treasury yield curve in effect for the expected term of the option at the time of grant. The annual dividend yield on the Company’s common stock is based on estimates of future dividends during the expected term of the NQSOs. The expected life of the NQSOs was determined based upon a simplified assumption that the NQSOs will be exercised evenly from vesting to expiration, as the Company does not have sufficient historical exercise data to provide a reasonable basis upon which to estimate the expected life.

For grants issued in 2012, 2011 and 2010, the volatility assumptions were based on historical volatility of Great Lakes and comparable publicly-traded companies, primarily more mature and well-established companies in the engineering and construction sector.

There is not an active market for options on the Company’s common stock and, as such, implied volatility for the Company’s stock was not considered. Additionally, the Company’s general policy is to issue new shares of registered common stock to satisfy stock option exercises or grants of restricted stock.

The weighted-average grant-date fair value of options granted during the years ended December 31, 2012, 2011 and 2010 was $2.93, $2.23 and $2.52 respectively. The fair value of each option was estimated using the following assumptions:


	2012	2011	2010

Expected volatility	55.0%	50.0%	50.0%
Expected dividends	1.3%	1.6%	1.2%
Expected term (in years)	5.5 - 6.5	5.5 - 6.5	5.5 - 6.5
Risk free rate	0.7% - 1.0%	1.5% - 2.2%	2.2% - 2.8%

A summary of stock option activity under the Incentive Plan as of December 31, 2012, and changes during the year ended December 31, 2012, is presented below:


Options	Shares		Weighted Average Exercise Price		Weighted-Average Remaining Contract Term (yrs)		Aggregate Intrinsic Value ($000's)

Outstanding as of January 1, 2012		1,259	$	5.11
Granted		497		6.45
Exercised		(102)		4.50
Forfeited or Expired		(17)		5.20
Outstanding as of December 31, 2012		1,637	$	5.56		8.0	$	5,524

Vested at December 31, 2012		760	$	5.24		7.1	$	4,355
Vested or expected to vest at December 31, 2012		1,604	$	5.54		8.0	$	5,430

Restricted stock units

RSUs generally vest in one installment on the third anniversary of the grant date. The fair value of RSUs was based upon the Company’s stock price on the date of grant. A summary of the status of the Company’s non-vested RSUs as of December 31, 2012, and changes during the year ended December 31, 2012, is presented below:


Nonvested Restricted Stock Units	Shares		Weighted-Average Grant-Date Fair Value

Outstanding as of January 1, 2012		465	$	5.08
Granted		307		6.58
Vested		(127)		4.16
Forfeited		(37)		6.28
Outstanding as of December 31, 2012		608	$	5.96

Expected to vest at December 31, 2012		589	$	5.95

As of December 31, 2012, there was $3,766 of total unrecognized compensation cost related to non-vested NQSOs and RSUs granted under the Plan. That cost is expected to be recognized over a weighted-average period of 1.2 years.

The Incentive Plan permits the employee to use vested shares from RSUs to satisfy the grantee’s U.S. federal income tax liability resulting from the issuance of the shares through the Company’s retention of that number of common shares having a market value as of the vesting date equal to such tax obligation up to the minimum statutory withholding requirements. The amount related to shares used for such tax withholding obligations was approximately $231 and $291 for the years ended December 31, 2012 and 2011, respectively.

In March 2011, Messrs. Berger and Biemeck each received 16 shares of the Company’s common stock per the terms of their respective employment agreements.

Director compensation

The Company uses a combination of cash and share-based compensation to attract and retain qualified candidates to serve on our Board of Directors. Compensation is paid to non-employee directors. Directors who are employees receive no additional compensation for services as members of the Board or any of its committees. All of our directors are non-employee directors with the exception of Messrs. Berger and Biemeck. Share-based compensation is paid pursuant to the Incentive Plan. Each non-employee director of the Company received an annual retainer of $155, payable quarterly in arrears, and was paid 50% in cash and 50% in common stock of the Company. The Chairman of the Board received an additional $250 of compensation, paid in stock.

In the years ended December 31, 2012, 2011 and 2010, 93, 83 and 61 shares, respectively, of the Company’s common stock were issued to non-employee directors under the Incentive Plan.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Retirement Plans

12 Months Ended

Dec. 31, 2012

Retirement Plans [Abstract]

Retirement Plans


	11.	RETIREMENT PLANS

The Company sponsors four 401(k) savings plans, one covering substantially all non-union salaried employees (“Salaried Plan”), a second covering its non-union hourly employees (“Hourly Plan”), a third plan specifically for its employees that are members of a tugboat union and a fourth for the salary and non-union employees of rivers & lakes. Under the Salaried Plan and Hourly Plan, individual employees may contribute a percentage of compensation and the Company will match a portion of the employees’ contributions. Additionally, the Salaried Plan includes a profit-sharing component, permitting the Company to make discretionary employer contributions to all eligible employees of the Salaried Plan. The Company’s expense for matching and discretionary contributions for 2012, 2011 and 2010, was $4,304, $3,942 and $4,726, respectively.

The Company also contributes to various multiemployer pension plans pursuant to collective bargaining agreements. The information available to the Company about the multiemployer plans in which it participates, whether via request to the plan or publicly available, is generally dated due to the nature of the reporting cycle of multiemployer plans and legal requirements under the Employee Retirement Income Security Act (“ERISA”) as amended by the Multiemployer Pension Plan Amendments Act (“MPPAA”). Based upon these plans’ most recently available annual reports, the Company’s contribution to these plans were less than 5% of each such plan’s total contributions. Information on significant multiemployer pension plans in which the Company participates is included in the table below:


		Pension Protection Act of 2006 Certified Zone Status at December 31,				Company's Contributions
Pension Plan Legal Name	Federal Identification Number	2012	2011	Expiration of Collective Bargaining Arrangement with the Company	2012		2011		2010

Massachusetts Laborers Pension Fund	04-6128298 001	Yellow	Yellow	Various dates in 2016	$	3,967	$	3,423	$	3,084
Central Pension Fund of the IUOE & Participating Employers	36-6052390 001	Green	Green	September 30, 2012		2,203		1,759		2,141
Excavators Union Local 731 Pension Fund	13-1809825 002	Green	Green	July 30, 2014		1,014		716		317
Seafarers Pension Trust	13-6100329 001	Green	Green	February 28, 2015		883		699		943
International Union of Operating Engineers Local 4 Pension Fund	04-6013863 001	Green	Green	May 31, 2014		829		583		624
Other pension plans						1,018		1,329		949
					$	9,914	$	8,509	$	8,058

At December 31, 2012 a funding improvement plan was in place for the Massachusetts Laborers Pension Fund and the Iron Workers Locals 40, 361 & 417 Pension Fund. Neither plan required the Company to pay a surcharge on contributions for years presented. The Company does not expect any future increased contributions to have a material negative impact on its financial position, results of operations or cash flows for future years. The risks of participating in multiemployer plans are different from single employer plans as assets contributed are available to provide benefits to employees of other employers and unfunded obligations from an employer that discontinues contributions are the responsibility of all remaining employers. In addition, in the event of a plan’s termination or the Company’s withdrawal from a plan, the Company may be liable for a portion of the plan’s unfunded vested benefits. However, information from the plans’ administrators is not available to permit the Company to determine its share, if any, of unfunded vested benefits.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments And Contingencies

12 Months Ended

Dec. 31, 2012

Commitments And Contingencies [Abstract]

Commitments And Contingencies

12. COMMITMENTS AND CONTINGENCIES

Commercial commitments

Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some demolition projects. In September 2011, the Company entered into a bonding agreement with Zurich American Insurance Company (“Zurich”) under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty and Surety Company of America. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At December 31, 2012, the Company had outstanding performance bonds valued at approximately $614,523; however, the revenue value remaining in backlog related to these projects totaled approximately $188,512.

Certain foreign projects performed by the Company have warranty periods, typically spanning no more than one to three years beyond project completion, whereby the Company retains responsibility to maintain the project site to certain specifications during the warranty period. Generally, any potential liability of the Company is mitigated by insurance, shared responsibilities with consortium partners, and/or recourse to owner-provided specifications.

Legal proceedings and other contingencies

As is customary with negotiated contracts and modifications or claims to competitively bid contracts with the federal government, the government has the right to audit the books and records of the Company to ensure compliance with such contracts, modifications, or claims, and the applicable federal laws. The government has the ability to seek a price adjustment based on the results of such audit. Any such audits have not had, and are not expected to have, a material impact on the financial position, operations, or cash flows of the Company.

Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against the Company and certain of its subsidiaries. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved, or settled adversely to the Company. Although the Company is subject to various claims and legal actions that arise in the ordinary course of business, except as described below, the Company is not currently a party to any material legal proceedings or environmental claims. The Company records an accrual when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. The Company does not believe any of these proceedings, individually or in the aggregate, would be expected to have a material effect on results of operations, cash flows or financial condition.

On August 26, 2009, the Company’s subsidiary, NASDI, LLC (“NASDI”), received a letter stating that the Attorney General for the Commonwealth of Massachusetts is investigating alleged violations of the Massachusetts Solid Waste Act. The Company believes that the Massachusetts Attorney General is investigating illegal dumping activities at a dump site NASDI contracted with to have waste materials disposed of between September 2007 and July 2008. Per the Massachusetts Attorney General’s request, NASDI executed a tolling agreement regarding the matter in 2009 and engaged in further discussions with the Massachusetts Attorney General’s office in the second quarter of 2011, but has had no further contact with the Massachusetts Attorney General’s office since then. The matter remains open, and, to the Company’s knowledge, no proceedings have currently been initiated against NASDI. Should a claim be brought, NASDI intends to defend itself vigorously. Based on consideration of all of the facts and circumstances now known, the Company does not believe this claim will have a material impact on its business, financial position, results of operations or cash flows.

On March 27, 2011, NASDI received a subpoena from a federal grand jury in the District of Massachusetts directing NASDI to furnish certain documents relating to certain projects performed by NASDI since January 2005. The Company conducted an internal investigation into this matter and continues to fully cooperate with the federal grand jury subpoena. Based on the early stage of the U.S. Department of Justice’s investigation and the limited information known to the Company, the Company cannot predict the outcome of the investigation, the U.S. Attorney’s views of the issues being investigated, any action the U.S. Attorney may take, or the impact, if any, that this matter may have on the Company’s business, financial position, results of operations or cash flows.

On March 19, 2013, the Company and three of its current and former executives were sued in a securities class action in the Northern District of Illinois captioned United Union of Roofers, Waterproofers & Allied Workers Local Union No. 8 v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02115. The lawsuit, which was brought on behalf of all purchasers of the Company’s securities between August 7, 2012 and March 14, 2013, primarily alleges that the defendants made false and misleading statements regarding the recognition of revenue in the demolition segment and with regard to the Company’s internal control over financial reporting. This suit was filed following the Company’s announcement on March 14, 2013 that it would restate its second and third quarter 2012 financial statements. A second, similar lawsuit captioned Boozer v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02339, was filed in the Northern District of Illinois on March 28, 2013. The Company denies liability and intends to vigorously defend these actions.

The Company has not accrued any amounts with respect to the above matters as the Company does not believe, based on information currently known to it, that a loss relating to these matters is probable, and an estimate of a range of potential losses relating to these matters cannot reasonably be made.

During the quarter ended March 31, 2012, a favorable judgment was rendered in the Company’s loss of use claim related to the dredge New York allision in the approach channel to Port Newark, New Jersey. In January 2008, the Company filed suit against the M/V Orange Sun and her owners for damages incurred by the Company in connection with the allision. Following a bench trial in the United States District Court in the Southern District of New York, the Court issued an opinion and order in the Company’s favor, entitling Great Lakes to $11,736 in damages plus pre-judgment interest. Judgment was rendered in the aggregate amount of $13,272. Defendants timely appealed the judgment to the United States Court of Appeals for the Second Circuit. Briefing on the appeal is now complete, and oral argument is expected to take place in the first half of 2013. The Company cannot be assured when the appeal will be heard or predict the outcome of the appellate process.

Lease obligations

The Company leases certain operating equipment and office facilities under long-term operating leases expiring at various dates through 2022. The equipment leases contain renewal or purchase options that specify prices at the then fair value upon the expiration of the lease terms. The leases also contain default provisions that are triggered by an acceleration of debt maturity under the terms of the Company’s Credit Agreement, or, in certain instances, cross default to other equipment leases and certain lease arrangements require that the Company maintain certain financial ratios comparable to those required by its Credit Agreement. Additionally, the leases typically contain provisions whereby the Company indemnifies the lessors for the tax treatment attributable to such leases based on the tax rules in place at lease inception. The tax indemnifications do not have a contractual dollar limit. To date, no lessors have asserted any claims against the Company under these tax indemnification provisions.

Future minimum operating lease payments at December 31, 2012, are as follows:


2013	$	19,408
2014		18,285
2015		17,298
2016		16,589
2017		13,915
Thereafter		13,422

Total minimum operating lease payments	$	98,917

Total rent expense under long-term operating lease arrangements for the years ended December 31, 2012, 2011 and 2010 was $19,263, $16,968 and $17,397, respectively. This excludes expenses for equipment and facilities rented on a short-term, as-needed basis.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
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-Name Statement of Financial Accounting Standard (FAS)
-Number 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Related-Party Transactions

12 Months Ended

Dec. 31, 2012

Related-Party Transactions


	13.	RELATED-PARTY TRANSACTIONS

The demolition business is operated out of a building owned by a minority interest owner in Yankee and prior to 2011, a profits interest owner in NASDI. In 2012, 2011 and 2010, NASDI and Yankee paid the minority interest owner $449, $483 and $312, respectively, for rent and property taxes.

Our rivers & lakes group operates out of a facility owned by the former owner of Matteson. The Company paid $95 and $103 in rent to the building owner during 2012 and 2011, respectively. As the purchase of Matteson occurred on December 31, 2010, the Company paid no rents in 2010.

Terra Contracting Services, LLC, operates out of facilities owned by the President of Terra Contracting Services, LLC who was also the former owner of Terra Contracting, LLC. As the purchase of Terra occurred on December 31, 2012, the Company paid no rents in 2012.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

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+ Details

Business Combinations And Reorganizations

12 Months Ended

Dec. 31, 2012

Business Combinations And Reorganizations [Abstract]

Business Combinations And Reorganizations


	14.	BUSINESS COMBINATIONS AND REORGANIZATIONS

Terra Contracting acquisition

On December 31, 2012, the Company acquired the assets including certain assumed liabilities of Terra Contracting, LLC, a respected provider of a wide variety of essential services for environmental, maintenance and infrastructure-related applications headquartered in Kalamazoo, MI, for a purchase price of approximately $26 million. The Terra acquisition will broaden the Company’s demolition segment with additional services and expertise as well as expand its footprint in the Midwest. Furthermore, the seller may receive cash payments for any of the calendar years ended 2013, 2014 and 2015 if certain earnings based criteria are met. Per the purchase agreement, for each calendar year, the earnout payment amount shall be equal to (i) 25% of the amount, up to $500, by which EBITDA exceeds $4,000 plus (ii) 50% of the amount by which EBITDA exceeds $4,500; provided, that in no event shall seller receive an amount more than $2,000. At December 31, 2012, the fair value of the recorded earnout liability was $1,636, of which $647 is recorded in accrued liabilities and $989 is recorded in other liabilities. After assuming the seller’s indebtedness, the acquisition was funded with a seller note of $10,547 and future contingent consideration. In addition, $2,000 of cash was placed in escrow pursuant to the indemnification clauses in the purchase agreement. The balance of the note was paid in January 2013.

The purchase price has been preliminarily allocated to the assets acquired and liabilities assumed using estimated fair values as of the acquisition date. Tangible assets acquired of $27 million primarily were receivables of $14.6 million and property, plant, and equipment of $11.3 million. Finite-lived intangible assets acquired of $2.7 million were primarily related to a non-compete agreement and also included acquired backlog, patents and trade names. The acquired backlog is being amortized on a straight-line basis over one year while all other finite-lived intangible assets are being amortized on a straight-line basis over five years. Liabilities assumed of $18.3 million, includes primarily $17.5 million of accounts payable. Goodwill of $2.8 million represents the excess of cost over the fair value of the net tangible and intangible assets acquired.

As the acquisition took place on December 31, 2012, no income or earnings of Terra were included in the consolidated statement of operations of the Company for the period ended December 31, 2012.

Matteson acquisition

On December 31, 2010, the Company acquired the assets of L.W. Matteson, Inc., a maintenance dredging, environmental dredging and levee construction company located in Burlington, IA, for a base purchase price of $45 million. The Matteson acquisition expands the Company’s service offering into inland river, lakes and environmental dredging and levee construction using dredge material. The purchase price was subject to an adjustment based upon the closing working capital balance, which resulted in the recognition of additional purchase price of $369. Furthermore, the seller may receive cash payments for any of the calendar years ended 2011, 2012 and 2013 if certain earnings-based criteria are met. Per the purchase agreement, if Business EBITDA for any of these calendar years exceeds $9.0 million but is equal to or less than $12.0 million, the earnout payment shall be an amount equal to the product of (i) the amount by which Business EBITDA for such earnout period exceeds $9.0 million multiplied by (ii) 15%, and if Business EBITDA for such earnout period is greater than $12.0 million, the earnout payment shall be in an amount equal to the sum of (i) $450 plus (ii) the product of (x) the amount by which Business EBITDA for such earnout period exceeds $12.0 million multiplied by (y) 25%. There is no limit to the amount of earnout the seller may receive. At December 31, 2012 and 2011, the fair value of the recorded earnout liability was $0 and $240 which is recorded in other liabilities. No further liability is currently expected as future earnings projections do not warrant any monies to be paid per the contingent earnout calculation.

The acquisition was funded with $37.5 million in cash and a seller note of $7.5 million. The following table summarizes the allocation of purchase price:



Property, plant and equipment	$	36,173
Inventories		4,637
Accounts receivable		4,173
Intangible assets		2,670
Other assets and liabilities--net		(644)
Total	$	47,009

The purchase price was allocated to the assets acquired and liabilities assumed using estimated fair values as of the acquisition date.

As the acquisition took place on December 31, 2010, no income or earnings of Matteson were included in the consolidated statement of operations of the Company for the period ended December 31, 2010.

The following unaudited pro forma consolidated financial information present the consolidated results of operations of the Company as they may have appeared had the acquisition described above occurred as of January 1, 2009 for purposes of the unaudited pro forma consolidated statements of operations.

The unaudited pro forma consolidated financial information are provided for illustrative purposes only and do not purport to present what the actual results of operations would have been had the Matteson transaction actually occurred on the date indicated, nor does it purport to represent results of operations for any future period. The information does not reflect any cost savings or other benefits that may be obtained through synergies among the operations of the Company.

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

PRO FORMA CONSOLIDATED STATEMENTS OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 31, 2010



	2010
	(Unaudited)

Revenue as reported	$	686,922
Revenue of purchased businesses for the period prior to acquisition		37,183
Pro forma revenue	$	724,105

Net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$	34,609
Net income of L.W. Matteson, Inc., including pro forma purchase accounting adjustments		3,257
Pro forma net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$	37,866

Senior management reorganization

In 2010, the Company recorded expense of $6,428 in connection with its severance arrangements with former executives. These payments are being made over a one to three year period per the terms of each former executive’s arrangement and, as of December 31, 2012 and 2011, $310 and $2,335, respectively, remained unpaid and was included in accrued expenses and other liabilities.

Effective March 13, 2013, Mr. Bruce Biemeck separated from the Company and no longer serves as President and Chief Operating Officer.

William S. Steckel was appointed Senior Vice President and Chief Financial Officer effective August 20, 2012.

Segment Information

12 Months Ended

Dec. 31, 2012

Segment Information [Abstract]

Segment Information

15. SEGMENT INFORMATION

The Company and its subsidiaries currently operate in two reportable segments: dredging and demolition. The Company’s financial reporting systems present various data for management to run the business, including profit and loss statements prepared according to the segments presented. Management uses operating income to evaluate performance between the two segments. Demolition segment information as of December 31, 2012 includes assets related to Terra. Segment information for 2012, 2011 and 2010, is provided as follows:


	2012		2011		2010

Dredging:
Contract revenues	$	586,855	$	520,134	$	608,969
Operating income		32,947		53,793		70,504
Depreciation and amortization		37,279		37,176		31,532
Total assets		757,666		742,292		646,158
Property and equipment—net		323,082		298,140		315,140
Goodwill		76,575		76,575		76,575
Investment in joint ventures		7,047		6,923		7,329
Capital expenditures		64,598		22,860		28,838
Demolition:
Contract revenues		100,729		107,199		77,953
Operating income (loss)		(17,442)		501		(2,074)
Depreciation and amortization		2,755		3,662		2,769
Total assets		68,729		46,168		47,667
Property and equipment—net		23,458		12,380		8,091
Goodwill		24,224		21,474		21,474
Capital expenditures		1,969		7,852		1,025
Total:
Contract revenues		687,584		627,333		686,922
Operating income		15,505		54,294		68,430
Depreciation and amortization		40,034		40,838		34,301
Total assets		826,395		788,460		693,825
Property and equipment—net		346,540		310,520		323,231
Goodwill		100,799		98,049		98,049
Investment in joint ventures		7,047		6,923		7,329
Capital expenditures		66,567		30,712		29,863

Dredging contract revenues for the year ended December 31, 2012 are net of $1,374 in intersegment revenues. Demolition contract revenues for the year ended December 31, 2012 are net of $75 in intersegment revenues.

The Company classifies the revenue related to its dredging projects into the following types of work:


	2012		2011		2010

Capital dredging — U.S.	$	175,317	$	156,251	$	300,873
Capital dredging — foreign		112,242		77,232		82,898
Coastal protection dredging		126,873		135,164		106,163
Maintenance dredging		136,550		116,016		119,035
Rivers & lakes		35,873		35,471		-

Total dredging	$	586,855	$	520,134	$	608,969

The Company derived revenues and gross profit from foreign project operations for the years ended December 31, 2012, 2011, and 2010, as follows:


	2011		2011		2010

Contract revenues	$	112,242	$	77,232	$	82,898
Costs of contract revenues		(104,038)		(63,256)		(76,708)

Gross profit	$	8,204	$	13,976	$	6,190

In 2011 and 2010, the majority of the Company’s foreign revenue came from projects in the Middle East, primarily Bahrain. In 2012, foreign revenues were primarily from projects in the Middle East as well as for the Wheatstone LNG project in Western Australia. The majority of the Company’s long-lived assets are marine vessels and related equipment. At any point in time, the Company may employ certain assets outside of the U.S., as needed, to perform work on the Company’s foreign projects. As of December 31, 2012 and 2011, long-lived assets with a net book value of $88,003 and $96,376, respectively, were located outside of the U.S.

The Company’s primary dredging customer is the U.S. Army Corps of Engineers (the “Corps”), which has responsibility for federally funded projects related to waterway navigation and flood control. In 2012, 2011 and 2010, 59.8%, 43.1% and 53.5%, respectively, of contract revenues were earned from dredging contracts with federal government agencies, including the Corps, as well as other federal entities such as the U.S. Coast Guard and U.S. Navy. At December 31, 2012 and 2011, approximately 26.0% and 36.9%, respectively, of accounts receivable, including contract revenues in excess of billings and retainage, were due on dredging contracts with federal government agencies. The Company depends on its ability to continue to obtain federal government dredging contracts, and indirectly, on the amount of federal funding for new and current government dredging projects. Therefore, the Company’s dredging operations can be influenced by the level and timing of federal funding.

In addition, the Company’s work overseas is primarily with the government of Bahrain which accounted for 11.7%, 7.6% and 8.1% of total revenue in 2012, 2011 and 2010, respectively. At December 31, 2012 and 2011, approximately 19.6% and 21.4%, respectively, of accounts receivable, including retainage and contract revenues in excess of billings, were due on dredging contracts with the government of Bahrain. There is a dependence on future projects in the Bahrain region, as vessels are currently located there. However, certain of the vessels located in Bahrain can be moved back to the U.S. or all can be moved to other international markets as opportunities arise.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Subsidiary Guarantors

12 Months Ended

Dec. 31, 2012

Subsidiary Guarantors [Abstract]

Subsidiary Guarantors

16. SUBSIDIARY GUARANTORS

The Company’s long-term debt at December 31, 2012 includes $250,000 of 7.375% senior notes due February 1, 2019. The Company’s obligations under these senior unsecured notes are guaranteed by the Company’s 100% owned domestic subsidiaries. Such guarantees are full, unconditional and joint and several.

The following supplemental financial information sets forth for the Company’s subsidiary guarantors (on a combined basis), the Company’s non-guarantor subsidiaries (on a combined basis) and Great Lakes Dredge & Dock Corporation, exclusive of its subsidiaries (“GLDD Corporation”):


	(i)	balance sheets as of December 31, 2012 and 2011;


	(ii)	statements of operations and comprehensive income for the years ended December 31, 2012, 2011 and 2010; and

(iii)

statements of cash flows for the years ended December 31, 2012, 2011 and 2010.


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2012
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	24,272	$	168	$	-	$	-	$	24,440
Accounts receivable — net		147,610		1,532		-		-		149,142
Receivables from affiliates		102,968		7,680		38,115		(148,763)		-
Contract revenues in excess of billings		69,649		5		-		(80)		69,574
Inventories		28,726		-		-		-		28,726
Prepaid expenses		9,452		-		102		-		9,554
Other current assets		17,695		28		14,531		-		32,254
Total current assets		400,372		9,413		52,748		(148,843)		313,690

PROPERTY AND EQUIPMENT—Net		346,503		37		-		-		346,540
GOODWILL		100,550		249		-		-		100,799
OTHER INTANGIBLE ASSETS—Net		3,137		95		-		-		3,232
INVENTORIES — Noncurrent		37,392		-		-		-		37,392
INVESTMENTS IN JOINT VENTURES		7,047		-		-		-		7,047
INVESTMENTS IN SUBSIDIARIES		2,127		-		618,070		(620,197)		-
OTHER		11,350		2		6,343		-		17,695
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	122,191	$	891	$	-	$	-	$	123,082
Payables to affiliates		105,303		4,843		38,647		(148,793)		-
Accrued expenses		29,417		677		8,396		-		38,490
Billings in excess of contract revenues		11,207		123		-		(50)		11,280
Current portion of long term debt		13,098		-		-		-		13,098
Total current liabilities		281,216		6,534		47,043		(148,843)		185,950

7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		623		-		106,144		-		106,767
OTHER		9,704		-		549		-		10,253
Total liabilities		291,543		6,534		403,736		(148,843)		552,970

Total Great Lakes Dredge & Dock Corporation Equity		616,935		3,262		273,635		(620,197)		273,635
NONCONTROLLING INTERESTS		-		-		(210)		-		(210)
TOTAL EQUITY		616,935		3,262		273,425		(620,197)		273,425
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2011
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	108,985	$	4,303	$	-	$	-	$	113,288
Accounts receivable — net		118,530		1,738		-		-		120,268
Receivables from affiliates		79,683		7,729		49,724		(137,136)		-
Contract revenues in excess of billings		26,323		153		-		(64)		26,412
Inventories		33,426		-		-		-		33,426
Prepaid expenses		3,847		-		132		-		3,979
Other current assets		12,082		125		16,198		-		28,405
Total current assets		382,876		14,048		66,054		(137,200)		325,778

PROPERTY AND EQUIPMENT—Net		310,459		61		-		-		310,520
GOODWILL		97,799		250		-		-		98,049
OTHER INTANGIBLE ASSETS—Net		675		139		-		-		814
INVENTORIES — Noncurrent		30,103		-		-		-		30,103
INVESTMENTS IN JOINT VENTURES		6,923		-		-		-		6,923
INVESTMENTS IN SUBSIDIARIES		4,385		-		627,754		(632,139)		-
OTHER		10,729		3		5,547		(6)		16,273
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	81,971	$	774	$	-	$	-	$	82,745
Payables to affiliates		85,865		7,234		44,053		(137,152)		-
Accrued expenses		22,445		629		8,047		-		31,121
Billings in excess of contract revenues		13,607		68		-		(48)		13,627
Current portion of long term debt		3,033		-		-		-		3,033
Total current liabilities		206,921		8,705		52,100		(137,200)		130,526

LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		399		-		103,959		(6)		104,352
OTHER		7,786		-		759		-		8,545
Total liabilities		217,606		8,705		406,818		(137,206)		495,923

Total Great Lakes Dredge & Dock Corporation Equity		626,343		5,796		291,969		(632,139)		291,969
NONCONTROLLING INTERESTS		-		-		568		-		568
TOTAL EQUITY		626,343		5,796		292,537		(632,139)		292,537
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2012
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	686,280	$	7,844	$	-	$	(6,540)	$	687,584
Costs of contract revenues		(616,243)		(9,482)		-		6,540		(619,185)
Gross profit		70,037		(1,638)		-		-		68,399

OPERATING EXPENSES:
General and administrative expenses		49,562		752		3,145		-		53,459
Gain on sale of assets—net		(660)		-		95		-		(565)
Operating income (loss)		21,135		(2,390)		(3,240)		-		15,505

Interest expense—net		(577)		(133)		(20,212)		-		(20,922)
Equity in earnings (loss) of subsidiaries		(1,871)		-		25,525		(23,654)		-
Equity in earnings of joint ventures		124		-		-		-		124
Loss on foreign currency transactions—net		(118)		-		-		-		(118)

Income (loss) before income taxes		18,693		(2,523)		2,073		(23,654)		(5,411)

Income tax (provision) benefit		7,484		-		(5,413)		-		2,071

Net income (loss)		26,177		(2,523)		(3,340)		(23,654)		(3,340)
Net loss attributable to noncontrolling interests		-		-		645		-		645
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	26,177	$	(2,523)	$	(2,695)	$	(23,654)	$	(2,695)

Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	25,800	$	(2,529)	$	(3,078)	$	(23,271)	$	(3,078)


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2011
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	619,643	$	19,941	$	-	$	(12,251)	$	627,333
Costs of contract revenues		(527,769)		(18,798)		-		12,251		(534,316)
Gross profit		91,874		1,143		-		-		93,017

OPERATING EXPENSES:
General and administrative expenses		46,285		797		3,352		-		50,434
Gain on sale of assets—net		(11,722)		-		11		-		(11,711)
Operating income (loss)		57,311		346		(3,363)		-		54,294

Interest expense—net		(780)		(156)		(20,729)		-		(21,665)
Equity in earnings (loss) of subsidiaries		2,075		-		56,442		(58,517)		-
Equity in earnings of joint ventures		(406)		-		-		-		(406)
Loss on foreign currency transactions—net		(264)		(18)		-		-		(282)
Loss on extinguishment of debt		-		-		(5,145)		-		(5,145)

Income (loss) before income taxes		57,936		172		27,205		(58,517)		26,796

Income tax (provision) benefit		404		5		(9,954)		-		(9,545)

Net income (loss)		58,340		177		17,251		(58,517)		17,251
Net income attributable to noncontrolling interests		-		-		(723)		-		(723)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	58,340	$	177	$	16,528	$	(58,517)	$	16,528

Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	57,986	$	177	$	16,174	$	(58,163)	$	16,174


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED DECEMBER 31, 2010
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	683,460	$	8,538	$	-	$	(5,076)	$	686,922
Costs of contract revenues		(559,754)		(9,462)		-		5,076		(564,140)
Gross profit		123,706		(924)		-		-		122,782

OPERATING EXPENSES:
General and administrative expenses		50,084		702		3,566		-		54,352
GAIN ON SALE OF ASSETS—Net		-		-		-		-		-
Operating income (loss)		73,622		(1,626)		(3,566)		-		68,430

Interest expense—net		26		(95)		(13,473)		-		(13,542)
Equity in earnings (loss) of subsidiaries		(1,721)		-		72,886		(71,165)		-
Equity in earnings of joint ventures		(614)		-		-		-		(614)
Loss on foreign currency transactions—net		-		-		-		-		-

Income (loss) before income taxes		71,313		(1,721)		55,847		(71,165)		54,274

Income tax (provision) benefit		1,573		-		(22,127)		-		(20,554)

Net income (loss)		72,886		(1,721)		33,720		(71,165)		33,720
Net loss attributable to noncontrolling interests		-		-		889		-		889
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	72,886	$	(1,721)	$	34,609	$	(71,165)	$	34,609

Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	72,704	$	(1,721)	$	34,427	$	(70,983)	$	34,427


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2012
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	27,755	$	(1,791)	$	(27,824)	$	-	$	(1,860)

INVESTING ACTIVITIES:
Purchases of property and equipment		(62,485)		-		-		-		(62,485)
Proceeds from dispositions of property and equipment		1,042		-		-		-		1,042
Acquisition of Terra assets		(2,000)		-		-		-		(2,000)

Net cash flows used in investing activities		(63,443)		-		-		-		(63,443)

FINANCING ACTIVITIES:
Deferred financing fees		-		-		(2,039)		-		(2,039)
Repayment of long term note payable		(2,500)		-		-		-		(2,500)
Distributions paid to minority interests		-		-		(133)		-		(133)
Dividends paid		-		-		(18,560)		-		(18,560)
Dividend equivalents paid on restricted stock units		-		-		(196)		-		(196)
Taxes paid on settlement of vested share awards		-		-		(231)		-		(231)
Net change in accounts with affiliates		(45,982)		(2,351)		48,333		-		-
Repayments of equipment debt		(543)		-		-		-		(543)
Exercise of stock options		-		-		461		-		461
Excess income tax benefit from share-based compensation		-		-		189		-		189

Net cash flows provided by (used in) financing activities		(49,025)		(2,351)		27,824		-		(23,552)

Effect of foreign currency exchange rates on cash and cash equivalents		-		7		-		-		7

Net decrease in cash and cash equivalents		(84,713)		(4,135)		-		-		(88,848)

Cash and cash equivalents at beginning of period		108,985		4,303		-		-		113,288

Cash and cash equivalents at end of period	$	24,272	$	168	$	-	$	-	$	24,440


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2011
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	51,145	$	(764)	$	(25,818)	$	-	$	24,563

INVESTING ACTIVITIES:
Purchases of property and equipment		(33,426)		(7)		-		-		(33,433)
Proceeds from dispositions of property and equipment		16,717		-		-		-		16,717

Net cash flows used in investing activities		(16,709)		(7)		-		-		(16,716)

FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		-		-		250,000		-		250,000
Redemption of 7 3/4% senior subordinated notes		-		-		(175,000)		-		(175,000)
Senior subordinated notes redemption premium		-		-		(2,264)		-		(2,264)
Deferred financing fees		-		-		(5,962)		-		(5,962)
Repayment of long term note payable		(2,500)				-		-		(2,500)
Dividends paid		-		-		(4,711)		-		(4,711)
Dividend equivalents paid on restricted stock units		-		-		(36)		-		(36)
Taxes paid on vested share awards		-		-		(291)		-		(291)
Net change in accounts with affiliates		33,962		2,038		(36,000)		-		-
Capital contributions		(3,418)		3,418		-		-		-
Repayments of equipment debt		(1,911)		-		-		-		(1,911)
Exercise of stock options		-		-		27		-		27
Excess income tax benefit from share-based compensation		-		-		55		-		55

Net cash flows provided by financing activities		26,133		5,456		25,818		-		57,407

Effect of foreign currency exchange rates on cash and cash equivalents		-		(444)		-		-		(444)

Net increase in cash and cash equivalents		60,569		4,241		-		-		64,810

Cash and cash equivalents at beginning of period		48,416		62		-		-		48,478

Cash and cash equivalents at end of period	$	108,985	$	4,303	$	-	$	-	$	113,288


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2010
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	157,248	$	(1,026)	$	(32,691)	$	-	$	123,531

INVESTING ACTIVITIES:
Purchases of property and equipment		(25,204)		(54)		-		-		(25,258)
Proceeds from dispositions of property and equipment		414		17		-		-		431
Purchase of Matteson		(37,869)		-		-		-		(37,869)

Net cash flows used in investing activities		(62,659)		(37)		-		-		(62,696)

FINANCING ACTIVITIES:
Dividends paid		-		-		(3,988)		-		(3,988)
Dividend equivalents paid on restricted stock units		-		-		(24)		-		(24)
Net change in accounts with affiliates		(48,606)		903		47,703		-		-
Repayments of equipment debt		(1,251)		-		-		-		(1,251)
Exercise of stock options		656		-		-		-		656
Borrowings under revolving loans		-		-		14,968		-		14,968
Repayments of revolving loans		-		-		(25,968)		-		(25,968)

Net cash flows provided by financing activities		(49,201)		903		32,691		-		(15,607)

Net increase in cash and cash equivalents		45,388		(160)		-		-		45,228

Cash and cash equivalents at beginning of period		3,028		222		-		-		3,250

Cash and cash equivalents at end of period	$	48,416	$	62	$	-	$	-	$	48,478

- Definition

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

+ References + Details

Schedule II—Valuation And Qualify Accounts

12 Months Ended

Dec. 31, 2012

Schedule II—Valuation And Qualifying Accounts [Abstract]

Schedule II—Valuation And Qualifying Accounts


Great Lakes Dredge & Dock Corporation
Schedule II—Valuation and Qualifying Accounts
For the Years Ended December 31, 2012, 2011 and 2010
(In thousands)

			Additions
	Beginning Balance		Charged to costs and expenses		Charged to other accounts		Deductions		Ending balance
Description
Year ended December 31, 2010
Allowances deducted from assets to which they apply:
Allowances for doubtful accounts	$	1,250	$	447	$	-	$	(42)	$	1,655

Year ended December 31, 2011
Allowances deducted from assets to which they apply:
Allowances for doubtful accounts	$	1,655	$	260	$	-	$	(76)	$	1,839

Year ended December 31, 2012
Allowances deducted from assets to which they apply:
Allowances for doubtful accounts	$	1,839	$	1,541	$	-	$	(1,396)	$	1,984

Nature Of Business And Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Nature Of Business And Summary Of Significant Accounting Policies [Abstract]

Principles Of Consolidation And Basis Of Presentation

Use Of Estimates

Revenue and Cost Recognition on Contracts

Classification of Current Assets and Liabilities

Cash Equivalents

Cash Equivalents —The Company considers all highly liquid investments with a maturity at purchase of three months or less to be cash equivalents.

Accounts Receivable , Net

Inventories

Property, Plant and Equipment


Class		Useful Life (years)
Buildings and improvements		10
Furniture and fixtures		5-10
Vehicles, dozers, and other light operating equipment and systems		3-5
Heavy operating equipment (dredges and barges)		10-30

Leasehold improvements are amortized over the shorter of their remaining useful lives or the remaining terms of the leases.

Goodwill and Intangible Assets

Long-Lived Assets

Self-insurance Reserves

Income Taxes

Hedging Instruments

Foreign Currency Translation

Noncontrolling Interest

Nature Of Business And Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Nature Of Business And Summary Of Significant Accounting Policies [Abstract]

Estimated Useful Lives By Class Of Assets


Class		Useful Life (years)
Buildings and improvements		10
Furniture and fixtures		5-10
Vehicles, dozers, and other light operating equipment and systems		3-5
Heavy operating equipment (dredges and barges)		10-30

Computations For Basic And Diluted Earnings Per Share



(shares in thousands)
	2012		2011		2010
Net income (loss) attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	(2,695)	$	16,528	$	34,609

Weighted-average common shares outstanding — basic		59,195		58,891		58,647
Effect of stock options and restricted stock units		-		339		224

Weighted-average common shares outstanding — diluted		59,195		59,230		58,871

Earnings (loss) per share — basic	$	(0.05)	$	0.28	$	0.59
Earnings (loss) per share — diluted	$	(0.05)	$	0.28	$	0.59

Accounts Receivable And Contracts In Progress (Tables)

12 Months Ended

Dec. 31, 2012

Accounts Receivable And Contracts In Progress [Abstract]

Schedule Of Accounts Receivable



	2012		2011
Completed contracts	$	43,898	$	38,317
Contracts in progress		91,459		69,469
Retainage		24,419		20,692
		159,776		128,478
Allowance for doubtful accounts		(2,050)		(1,839)

Total accounts receivable—net	$	157,726	$	126,639

Current portion of accounts receivable—net	$	149,142	$	120,268
Long-term accounts receivable and retainage		8,584		6,371
Total accounts receivable—net	$	157,726	$	126,639

Components Of Contracts In Progress



	2012		2011
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	458,750	$	173,187
Amounts billed		(392,860)		(152,045)
Costs and earnings in excess of billings for contracts in progress		65,890		21,142

Costs and earnings in excess of billings for completed contracts		3,684		7,459

Total contract revenues in excess of billings	$	69,574	$	28,601

Current portion of contract revenues in excess of billings	$	69,574	$	26,412
Portion included in other noncurrent assets		-		2,189
Total contract revenues in excess of billings	$	69,574	$	28,601

Billings in excess of costs and earnings:
Amounts billed	$	(338,741)	$	(427,797)
Costs and earnings for contracts in progress		327,461		414,170

Total billings in excess of contract revenues	$	(11,280)	$	(13,627)

Property And Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property And Equipment [Abstract]

Schedule Of Property Plant And Equipment



	2012		2011

Land	$	9,205	$	2,764
Buildings and improvements		5,184		5,184
Furniture and fixtures		4,585		3,636
Operating equipment		563,101		519,008
Construction in progress on build-to-suit vessels		10,415		-

Total property and equipment		592,490		530,592

Accumulated depreciation		(245,950)		(220,072)

Property and equipment — net	$	346,540	$	310,520

Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill And Other Intangible Assets [Abstract]

Schedule of Goodwill



	Dredging Segment		Demolition Segment		Total

Balance - January 1, 2011	$	76,575	$	21,474	$	98,049
		-		-		-

Balance - December 31, 2011		76,575		21,474		98,049
Acquisition of Terra Contracting		-		2,750		2,750

Balance - December 31, 2012	$	76,575	$	24,224	$	100,799


Goodwill	$	76,575	$	29,040	$	105,615

Accumulated Impairment Loss		-		(4,816)		(4,816)

Balance - December 31, 2012	$	76,575	$	24,224	$	100,799

Schedule of the Net Book Value Of Indentifiable Intangible Assets



As of December 31, 2012	Cost		Accumulated Amortization		Net

Non-compete agreement	$	1,852	$	421	$	1,431
Customer relationships		1,481		1,335		146
Software and databases		1,209		1,136		73
Backlog		627		-		627
Trade names		499		70		429
Other		526		-		526

	$	6,194	$	2,962	$	3,232


As of December 31, 2011

Customer relationships	$	1,481	$	1,279	$	202
Software and databases		1,209		1,063		146
Non-compete agreement		744		313		431
Trade names		88		53		35

	$	3,522	$	2,708	$	814

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2012

Accrued Expenses [Abstract]

Accrued Expenses



	2012		2011

Payroll and employee benefits	$	9,906	$	10,763
Insurance		9,070		8,285
Interest		7,837		7,759
Construction liabilities		6,426		-
Income and other taxes		1,699		1,261
Percentage of completion adjustment		1,552		1,855
Other		2,000		1,198
Total accrued expenses	$	38,490	$	31,121

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-Term Debt [Abstract]

Schedule Of Long-Term Debt




	2012		2011

Equipment notes payable	$	51	$	591
Note payable		13,047		5,000
7.375% senior notes		250,000		250,000

Subtotal		263,098		255,591

Current portion of note payable		(13,047)		(2,500)
Current portion of equipment debt		(51)		(533)

Total	$	250,000	$	252,558

Maturities Of Long-Term Debt



Years Ending December 31

2013	$	13,047
2014		-
2015		-
2016		-
2017		-
Thereafter		250,000

Total	$	263,047

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Measurements [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value


				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Liabilities
Fuel hedge contracts	$	178	$	-	$	178	$	-

				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	449	$	-	$	449	$	-
Interest rate swap contracts		755		-		755		-
Foreign exchange contracts		155		-		155		-
Total assets measured at fair value	$	1,359	$	-	$	1,359	$	-

Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2011
Interest rate swap contracts
Balance at January 1	$	1,264
Total unrealized gains (losses) included in earnings		(1,396)
Settlements		887
Transfers out of Level 3		(755)
Balance at December 31	$	-

Schedule Fair Value Measurements Balance Sheet Location


	Balance Sheet Location	Fair Value at December 31,
Asset derivatives:		2012		2011
Derivatives designated as hedges
Fuel hedge contracts	Other current assets	$	-	$	449
Derivatives not designated as hedges
Interest rate swaps	Other current assets		-		755
Foreign exchange contracts	Other current assets		-		155
Total asset derivatives		$	-	$	1,359

Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	178	$	-

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References + Details

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15
-Subparagraph b-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph c(2), d, e, f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph a, c(1), c(2), c(3), d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Pre-Tax Income From Domestic And Foreign Operations


	2012		2011		2010

Domestic operations	$	(1,212)	$	21,590	$	56,333
Foreign operations		(4,199)		5,206		(2,059)
Total pre-tax income (loss)	$	(5,411)	$	26,796	$	54,274

Provision For Income Taxes


	2012		2011		2010

Federal:
Current	$	(5,226)	$	(5,657)	$	11,602
Deferred		1,696		13,762		6,772
State:
Current		201		403		2,431
Deferred		(717)		700		(602)
Foreign:
Current		-		337		351
Deferred		1,975		-		-
Total	$	(2,071)	$	9,545	$	20,554

Income Tax Provision Reconciliation


	2012		2011		2010

Tax provision (benefit) at statutory U.S. federal
income tax rate	$	(1,894)	$	9,378	$	18,996
State income tax — net of federal income tax benefit		(1,061)		730		1,497
Foreign income tax benefit		-		(1,367)		440
Tax on (income) loss attributable to noncontrolling interests		242		(253)		268
Change in deferred state tax rate		246		-		-
Changes in unrecognized tax benefits		(137)		15		(1,215)
Changes in valuation allowance		228		1,588		59
Other		305		(546)		509

Income tax provision (benefit)	$	(2,071)	$	9,545	$	20,554

Reconciliation Of Unrecognized Tax Benefits


	2012		2011		2010

Unrecognized tax benefits — January 1	$	633	$	630	$	2,038
Gross increases — tax positions in prior period		79		3		-
Gross increases — current period tax positions		80		-		-
Gross decreases — expirations in prior period		(321)		-		(113)
Gross decreases — tax positions in prior period		-		-		(1,015)
Settlements		-		-		(280)

Unrecognized tax benefits — December 31,	$	471	$	633	$	630

Deferred Tax Assets (Liabilities)


	2012		2011

Deferred tax assets:
Accrued liabilities	$	9,785	$	8,177
Tax credit carryforwards		2,366		391
Foreign NOLs		2,632		2,632
State NOLs		2,719		1,285
Investment in Yankee Environmental Services		441		-
Fuel hedges		71		-
Valuation allowance		(3,352)		(3,124)
Total deferred tax assets		14,662		9,361

Deferred tax liabilities:
Depreciation and amortization		(113,969)		(106,671)
Other liabilities		(1,975)
Investment in NASDI, LLC and Yankee Environmental Services		-		(942)
Fuel hedges		-		(179)
Total deferred tax liabilities		(115,944)		(107,792)
Net deferred tax liabilities	$	(101,282)		(98,431)

As reported in the balance sheet:
Net current deferred tax assets (included in other current assets)	$	5,485		5,921
Net noncurrent deferred tax liabilities		(106,767)		(104,352)
Net deferred tax liabilities	$	(101,282)		(98,431)

Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Share-Based Compensation [Abstract]

Option Pricing Assumptions


	2012	2011	2010

Expected volatility	55.0%	50.0%	50.0%
Expected dividends	1.3%	1.6%	1.2%
Expected term (in years)	5.5 - 6.5	5.5 - 6.5	5.5 - 6.5
Risk free rate	0.7% - 1.0%	1.5% - 2.2%	2.2% - 2.8%

Summary Of Stock Option Activity


Options	Shares		Weighted Average Exercise Price		Weighted-Average Remaining Contract Term (yrs)		Aggregate Intrinsic Value ($000's)

Outstanding as of January 1, 2012		1,259	$	5.11
Granted		497		6.45
Exercised		(102)		4.50
Forfeited or Expired		(17)		5.20
Outstanding as of December 31, 2012		1,637	$	5.56		8.0	$	5,524

Vested at December 31, 2012		760	$	5.24		7.1	$	4,355
Vested or expected to vest at December 31, 2012		1,604	$	5.54		8.0	$	5,430

Summary Of Non-Vested Restricted Stock Units


Nonvested Restricted Stock Units	Shares		Weighted-Average Grant-Date Fair Value

Outstanding as of January 1, 2012		465	$	5.08
Granted		307		6.58
Vested		(127)		4.16
Forfeited		(37)		6.28
Outstanding as of December 31, 2012		608	$	5.96

Expected to vest at December 31, 2012		589	$	5.95

Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2012

Retirement Plans [Abstract]

Schedule Of Multiemployer Plans


		Pension Protection Act of 2006 Certified Zone Status at December 31,				Company's Contributions
Pension Plan Legal Name	Federal Identification Number	2012	2011	Expiration of Collective Bargaining Arrangement with the Company	2012		2011		2010

Massachusetts Laborers Pension Fund	04-6128298 001	Yellow	Yellow	Various dates in 2016	$	3,967	$	3,423	$	3,084
Central Pension Fund of the IUOE & Participating Employers	36-6052390 001	Green	Green	September 30, 2012		2,203		1,759		2,141
Excavators Union Local 731 Pension Fund	13-1809825 002	Green	Green	July 30, 2014		1,014		716		317
Seafarers Pension Trust	13-6100329 001	Green	Green	February 28, 2015		883		699		943
International Union of Operating Engineers Local 4 Pension Fund	04-6013863 001	Green	Green	May 31, 2014		829		583		624
Other pension plans						1,018		1,329		949
					$	9,914	$	8,509	$	8,058

Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments And Contingencies [Abstract]

Future Minimum Operating Lease Payments


2013	$	19,408
2014		18,285
2015		17,298
2016		16,589
2017		13,915
Thereafter		13,422

Total minimum operating lease payments	$	98,917

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References + Details

Business Combinations And Reorganizations (Tables)

12 Months Ended

Dec. 31, 2012

Business Combinations And Reorganizations [Abstract]

Summary Of Purchase Price Allocation



Property, plant and equipment	$	36,173
Inventories		4,637
Accounts receivable		4,173
Intangible assets		2,670
Other assets and liabilities--net		(644)
Total	$	47,009

Unaudited Pro Forma Consolidated Financial Information



	2010
	(Unaudited)

Revenue as reported	$	686,922
Revenue of purchased businesses for the period prior to acquisition		37,183
Pro forma revenue	$	724,105

Net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$	34,609
Net income of L.W. Matteson, Inc., including pro forma purchase accounting adjustments		3,257
Pro forma net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$	37,866

- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References + Details

Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Information [Abstract]

Segment Reporting By Segment


	2012		2011		2010

Dredging:
Contract revenues	$	586,855	$	520,134	$	608,969
Operating income		32,947		53,793		70,504
Depreciation and amortization		37,279		37,176		31,532
Total assets		757,666		742,292		646,158
Property and equipment—net		323,082		298,140		315,140
Goodwill		76,575		76,575		76,575
Investment in joint ventures		7,047		6,923		7,329
Capital expenditures		64,598		22,860		28,838
Demolition:
Contract revenues		100,729		107,199		77,953
Operating income (loss)		(17,442)		501		(2,074)
Depreciation and amortization		2,755		3,662		2,769
Total assets		68,729		46,168		47,667
Property and equipment—net		23,458		12,380		8,091
Goodwill		24,224		21,474		21,474
Capital expenditures		1,969		7,852		1,025
Total:
Contract revenues		687,584		627,333		686,922
Operating income		15,505		54,294		68,430
Depreciation and amortization		40,034		40,838		34,301
Total assets		826,395		788,460		693,825
Property and equipment—net		346,540		310,520		323,231
Goodwill		100,799		98,049		98,049
Investment in joint ventures		7,047		6,923		7,329
Capital expenditures		66,567		30,712		29,863


	2012		2011		2010

Capital dredging — U.S.	$	175,317	$	156,251	$	300,873
Capital dredging — foreign		112,242		77,232		82,898
Coastal protection dredging		126,873		135,164		106,163
Maintenance dredging		136,550		116,016		119,035
Rivers & lakes		35,873		35,471		-

Total dredging	$	586,855	$	520,134	$	608,969

Revenues And Gross Profit From Foreign Project Operations


	2011		2011		2010

Contract revenues	$	112,242	$	77,232	$	82,898
Costs of contract revenues		(104,038)		(63,256)		(76,708)

Gross profit	$	8,204	$	13,976	$	6,190

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Subsidiary Guarantors (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2011

Dec. 31, 2012

Subsidiary Guarantors [Abstract]

Condensed Consolidating of Balance Sheet


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2011
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	108,985	$	4,303	$	-	$	-	$	113,288
Accounts receivable — net		118,530		1,738		-		-		120,268
Receivables from affiliates		79,683		7,729		49,724		(137,136)		-
Contract revenues in excess of billings		26,323		153		-		(64)		26,412
Inventories		33,426		-		-		-		33,426
Prepaid expenses		3,847		-		132		-		3,979
Other current assets		12,082		125		16,198		-		28,405
Total current assets		382,876		14,048		66,054		(137,200)		325,778

PROPERTY AND EQUIPMENT—Net		310,459		61		-		-		310,520
GOODWILL		97,799		250		-		-		98,049
OTHER INTANGIBLE ASSETS—Net		675		139		-		-		814
INVENTORIES — Noncurrent		30,103		-		-		-		30,103
INVESTMENTS IN JOINT VENTURES		6,923		-		-		-		6,923
INVESTMENTS IN SUBSIDIARIES		4,385		-		627,754		(632,139)		-
OTHER		10,729		3		5,547		(6)		16,273
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	81,971	$	774	$	-	$	-	$	82,745
Payables to affiliates		85,865		7,234		44,053		(137,152)		-
Accrued expenses		22,445		629		8,047		-		31,121
Billings in excess of contract revenues		13,607		68		-		(48)		13,627
Current portion of long term debt		3,033		-		-		-		3,033
Total current liabilities		206,921		8,705		52,100		(137,200)		130,526

LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		399		-		103,959		(6)		104,352
OTHER		7,786		-		759		-		8,545
Total liabilities		217,606		8,705		406,818		(137,206)		495,923

Total Great Lakes Dredge & Dock Corporation Equity		626,343		5,796		291,969		(632,139)		291,969
NONCONTROLLING INTERESTS		-		-		568		-		568
TOTAL EQUITY		626,343		5,796		292,537		(632,139)		292,537
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2012
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	24,272	$	168	$	-	$	-	$	24,440
Accounts receivable — net		147,610		1,532		-		-		149,142
Receivables from affiliates		102,968		7,680		38,115		(148,763)		-
Contract revenues in excess of billings		69,649		5		-		(80)		69,574
Inventories		28,726		-		-		-		28,726
Prepaid expenses		9,452		-		102		-		9,554
Other current assets		17,695		28		14,531		-		32,254
Total current assets		400,372		9,413		52,748		(148,843)		313,690

PROPERTY AND EQUIPMENT—Net		346,503		37		-		-		346,540
GOODWILL		100,550		249		-		-		100,799
OTHER INTANGIBLE ASSETS—Net		3,137		95		-		-		3,232
INVENTORIES — Noncurrent		37,392		-		-		-		37,392
INVESTMENTS IN JOINT VENTURES		7,047		-		-		-		7,047
INVESTMENTS IN SUBSIDIARIES		2,127		-		618,070		(620,197)		-
OTHER		11,350		2		6,343		-		17,695
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	122,191	$	891	$	-	$	-	$	123,082
Payables to affiliates		105,303		4,843		38,647		(148,793)		-
Accrued expenses		29,417		677		8,396		-		38,490
Billings in excess of contract revenues		11,207		123		-		(50)		11,280
Current portion of long term debt		13,098		-		-		-		13,098
Total current liabilities		281,216		6,534		47,043		(148,843)		185,950

7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		623		-		106,144		-		106,767
OTHER		9,704		-		549		-		10,253
Total liabilities		291,543		6,534		403,736		(148,843)		552,970

Total Great Lakes Dredge & Dock Corporation Equity		616,935		3,262		273,635		(620,197)		273,635
NONCONTROLLING INTERESTS		-		-		(210)		-		(210)
TOTAL EQUITY		616,935		3,262		273,425		(620,197)		273,425
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395

Nature Of Business And Summary Of Significant Accounting Policies (Narrative) (Details)	1 Months Ended	12 Months Ended			36 Months Ended
	Mar. 31, 2011 USD ($)	Dec. 31, 2012 USD ($) segment shares	Dec. 31, 2011 USD ($) shares	Dec. 31, 2010 shares	Dec. 31, 2011	Jun. 30, 2012	Jan. 02, 2009
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments \| segment		2
Accrued for retroactive premuim adjustment assessments		$ 0	$ 0
Acquisition of Noncontrolling Interest			$ 1,933,000
Noncontrolling owners membership interest				35.00%
Shares excluded from computation of diluted earnings per share \| shares		478	299	0
NASDI, LLC [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Acquisition of Noncontrolling Interest			$ 1,973,000
Adjustment of NonControlling Interest	$ 1,933,000
Ownership interest percentage		100.00%		65.00%
Yankee Environmental Services, LLC [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Acquired membership interest							65.00%
Maximum [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Average equipment-related costs of total costs of contract revenue					25.00%
Minimum [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Average equipment-related costs of total costs of contract revenue					21.00%
Dredging And Demolition [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Fair value in excess of carrying value						35.00%

Nature Of Business And Summary Of Significant Accounting Policies (Estimated Useful Lives By Class Of Assets) (Details)	12 Months Ended
	Dec. 31, 2012
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life	10 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	10 years
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	5 years
Vehicles, Dozers, And Other Light Operating Equipment And Systems [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	5 years
Vehicles, Dozers, And Other Light Operating Equipment And Systems [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	3 years
Heavy Operating Equipment (Dredges And Barges) [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life	30 years
Heavy Operating Equipment (Dredges And Barges) [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life	10 years

Nature Of Business And Summary Of Significant Accounting Policies (Computations For Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$ (2,695)	$ 16,528	$ 34,609
Weighted-average common shares outstanding — basic	59,195	58,891	58,647
Effect of stock options and restricted stock units		339	224
Weighted-average common shares outstanding — diluted	59,195	59,230	58,871
Earnings per share — basic	$ (0.05)	$ 0.28	$ 0.59
Earnings per share — diluted	$ (0.05)	$ 0.28	$ 0.59
GLDD Corporation [Member]
Net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$ (2,695)	$ 16,528	$ 34,609

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Paragraph 52
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-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.7-04.22)
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Emerging Issues Task Force (EITF)
-Number 87-21
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Restricted And Escrowed Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash and Cash Equivalents [Line Items]
Other noncurrent assets	$ 17,695	$ 16,273
Other current assets	32,254	28,405
Cash and cash equivalents	24,440	113,288	$ 48,478	$ 3,250
GLDD Corporation [Member]
Cash and Cash Equivalents [Line Items]
Other noncurrent assets	6,343	5,547
Other current assets	14,531	16,198
Escrow Account [Member]
Cash and Cash Equivalents [Line Items]
Other noncurrent assets	1,500	$ 1,500
Other current assets	$ 450

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7
-Footnote 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable [Line Items]
Retainage	$ 24,419	$ 20,692
Accounts Receivable, Gross	159,776	128,478
Allowance for doubtful accounts	(2,050)	(1,839)
Total accounts receivable—net	157,726	126,639
Current portion of accounts receivable—net	149,142	120,268
Long-term accounts receivable and retainage	8,584	6,371
Completed Contracts [Member]
Accounts Receivable [Line Items]
Contracts	43,898	38,317
Contracts In Progress [Member]
Accounts Receivable [Line Items]
Contracts	$ 91,459	$ 69,469

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings in excess of billings on contracts in progress	$ 65,890	$ 21,142
Costs and earnings in excess of billings for completed contracts	3,684	7,459
Total contract revenues in excess of billings	69,574	28,601
Current portion of contract revenues in excess of billings	69,574	26,412
Portion included in other noncurrent assets		2,189
Total billings in excess of contract revenues	(11,280)	(13,627)
Costs And Earnings In Excess Of Billings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings for contracts in progress	458,750	173,187
Amounts billed	392,860	152,045
Billings In Excess Of Costs And Earnings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings for contracts in progress	327,461	414,170
Amounts billed	$ 338,741	$ 427,797

Property And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Property And Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 592,490	$ 530,592
Accumulated depreciation	(245,950)	(220,072)
Property and equipment — net	346,540	310,520	$ 323,231
Depreciation	39,781	38,372	$ 33,874
Land [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	9,205	2,764
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	5,184	5,184
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	4,585	3,636
Operating Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	563,101	$ 519,008
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 10,415

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 254	$ 2,466	$ 427
2013	1,289
2014	572
2015	552
2016	409
2017	$ 409
Terra [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	4 years
Matteson [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period			1 year 9 months 18 days

Goodwill And Other Intangible Assets (Change in the Carrying Amount Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2010
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 98,049
Acquisition of Terra Contracting	2,750
Goodwill, Ending Balance	100,799
Goodwill		$ 105,615
Accumulated Impairment Loss		(4,816)
Balance - December 31, 2012	98,049	100,799	$ 98,049
Dredging Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	76,575
Goodwill, Ending Balance	76,575
Goodwill		76,575
Balance - December 31, 2012	76,575	76,575	76,575
Demolition Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	21,474
Acquisition of Terra Contracting	2,750
Goodwill, Ending Balance	24,224
Goodwill		29,040
Accumulated Impairment Loss		(4,816)
Balance - December 31, 2012	$ 21,474	$ 24,224	$ 21,474

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill And Other Intangible Assets (Net Book Value Of Identifiable Assetsl) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 6,194	$ 3,522
Accumulated amortization	2,962	2,708
Net	3,232	814
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,852	744
Accumulated amortization	421	313
Net	1,431	431
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,481	1,481
Accumulated amortization	1,335	1,279
Net	146	202
Software And Databases [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,209	1,209
Accumulated amortization	1,136	1,063
Net	73	146
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	627
Net	627
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	499	88
Accumulated amortization	70	53
Net	429	$ 35
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	526
Net	$ 526

Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Accrued Expenses [Abstract]
Payroll and employee benefits	$ 9,906	$ 10,763
Insurance	9,070	8,285
Interest	7,837	7,759
Construction liabilities	6,426
Income and other taxes	1,699	1,261
Percentage of completion adjustment	1,552	1,855
Other	2,000	1,198
Total accrued expenses	$ 38,490	$ 31,121

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

Long-term Debt (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
Long-term Debt (Narrative) (Details) - USD ($)	Jan. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 04, 2012
Debt Instrument [Line Items]
Letters of credit outstanding		$ 35,663,000
Letter of credit remaining borrowing capacity		139,337,000
Debt Instrument, Fair Value Disclosure	$ 100
Remaining principal payment due December 31, 2013		13,047,000
Amortization of deferred financing fees		1,245,000	$ 1,515,000	$ 1,607,000
Equipment notes payable		51,000	591,000
Current portion of equipment debt		51,000	533,000
Noncurrent portion of equipment debt			58,000
Net book value of related assets		$ 190,000	2,450,000
Property and equipment purchased on capital leases and equipment notes			$ 2,127,000	109,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000
Stated interest rate	7.375%
Maturity date		Feb. 01, 2019
Proceeds from issuance of long-term debt	$ 244,171,000
Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 175,000,000
Stated interest rate	7.75%
Maturity date		Dec. 01, 2013
Debt instrument redemption	$ 180,014,000
Secured Debt [Member] \| Matteson [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 7,500,000
Stated interest rate		6.00%
Remaining principal payment due December 31, 2013		$ 2,500,000
Secured Debt [Member] \| Terra [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		10,547,000
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 24,000,000
Percentage of facility covered		90.00%
Line of Credit Facility, Maximum Borrowing Capacity		$ 24,000,000
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Remaining principal payment due December 31, 2013		$ 51,000
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 125,000,000
Line of Credit Facility, Maximum Borrowing Capacity					125,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					175,000,000
Line of credit facility optional increase capacity					50,000,000
Revolving credit facility, interest rate description		Depending on the Company's consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum.
Line of Credit Facility, Maximum Borrowing Capacity					175,000,000
Multicurrency [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					50,000,000
Line of Credit Facility, Maximum Borrowing Capacity					50,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					10,000,000
Line of Credit Facility, Maximum Borrowing Capacity					$ 10,000,000
Maximum [Member] \| LIBOR Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate		2.50%
Maximum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate		1.50%
Minimum [Member] \| LIBOR Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate		1.50%
Minimum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate		0.50%

Long-term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2011
Equipment notes payable	$ 51	$ 591
Note payable	13,047	5,000
7.375% senior notes	250,000	250,000	$ 250,000
Long term debt	263,098	255,591
Current portion of note payable	(13,047)	(2,500)
Current portion of equipment debt	(51)	(533)
Noncurrent long term debt	250,000	252,558
GLDD Corporation [Member]
7.375% senior notes	$ 250,000	$ 250,000

Long-Term Debt (Maturities Of Long-Term Debt) (Details) $ in Thousands	Dec. 31, 2012 USD ($)
Long-Term Debt [Abstract]
2013	$ 13,047
Thereafter	250,000
Long term debt excluding equipment	$ 263,047

Fair Value Measurements (Narrative) (Details)
$ in Thousands, gal in Millions

12 Months Ended

Dec. 31, 2012

USD ($)

$ / gal

gal

Dec. 31, 2011

USD ($)

Dec. 31, 2010

USD ($)

Jan. 31, 2011

USD ($)

May 31, 2009

USD ($)

Derivative asset, notional amount

$ 50,000

Derivative, average fixed interest rate

7.75%

Derivative underlying hedge percent

80.00%

Derivative nonmonetary notional gallons amount | gal

2.8

Senior Notes

$ 250,000

Reclassification of derivative losses to earnings—net of tax

^[1]

(1,437)

$ (321)

Fair value hedge liabilities

$ 178

Fair value hedge assets

449

Senior notes interest rate

7.375%

GLDD Corporation [Member]

Senior Notes

$ 250,000

Maximum [Member]

Fixed price range | $ / gal

3.29

Minimum [Member]

Fixed price range | $ / gal

3.01

Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member]

Senior Notes

$ 268,125

[1]	Net of income tax (provision) benefit of $2, $(882) and $(213) for the years ended December 31, 2012, 2011 and 2010, respectively.

Fair Value Measurements (Fair Value Measurements at Reporting Date Using) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Assets, fair value disclosure		$ 1,359
Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		1,359
Fuel Hedge Contracts [Member]
Assets, fair value disclosure		449
Liabilities, fair value disclosure	$ 178
Fuel Hedge Contracts [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		449
Liabilities, fair value disclosure	$ 178
Foreign Exchange Contract [Member]
Assets, fair value disclosure		155
Foreign Exchange Contract [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		155
Interest Rate Contract [Member]
Assets, fair value disclosure		755
Interest Rate Contract [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		$ 755

Fair Value Measurements (Fair Value Measurements Using Significant Unobservable) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2011 USD ($)
Fair Value Measurements [Abstract]
Balance at January 1	$ 1,264
Total unrealized gains (losses) included in earnings	(1,396)
Settlements	887
Transfers out of Level 3	$ (755)

Fair Value Measurements (Balance Sheet Location) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, net,		$ 1,359
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset		755
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset		155
Fuel Hedge Contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset		$ 449
Fuel Hedge Contracts [Member] \| Designated as Hedging Instrument [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross liability	$ 178

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
Unrecognized tax benefits	$ 471	$ 633	$ 630	$ 2,038
Amount of unrecognized tax benefits which would have an impact on the effective tax rate	241	347
Interest and penalties recorded	148	196
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	51,597	26,159
Valuation allowance for net operating loss carryforwards	720	492
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	10,164	10,164
Valuation allowance for net operating loss carryforwards	$ 2,632	$ 2,632

- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 30
-Paragraph 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 17
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes (Pre-Tax Income From Domestic And Foreign Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Domestic operations	$ (1,212)	$ 21,590	$ 56,333
Foreign operations	(4,199)	5,206	(2,059)
Total pre-tax income	$ (5,411)	$ 26,796	$ 54,274

Income Taxes (Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Current federal tax expense (benefit)	$ (5,226)	$ (5,657)	$ 11,602
Deferred federal tax expense (benefit)	1,696	13,762	6,772
Current state tax expense (benefit)	201	403	2,431
Deferred state tax expense (benefit)	(717)	700	(602)
Current foreign tax expense (benefit)		337	351
Deferred foreign tax expense (benefit)	1,975
Income tax provision	$ (2,071)	$ 9,545	$ 20,554

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Paragraph Question 1-7

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

+ Details

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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-Section 08
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's net foreign deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of applicable enacted tax laws of countries other than the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

The component of total income tax expense for the period comprised of the increase (decrease) in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 8, 16, 17, 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

+ Details

Income Taxes (Income Tax Provision Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Tax provision at statutory U.S. federal income tax rate	$ (1,894)	$ 9,378	$ 18,996
State income tax — net of federal income tax benefit	(1,061)	730	1,497
Foreign income tax benefit		(1,367)	440
Tax on (income) loss attributable to noncontrolling interests	242	(253)	268
Change in deferred state tax rate	246
Changes in unrecognized tax benefits	(137)	15	(1,215)
Changes in valuation allowance	228	1,588	59
Other	305	(546)	509
Income tax provision	$ (2,071)	$ 9,545	$ 20,554

Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Unrecognized tax benefits — January 1	$ 633	$ 630	$ 2,038
Gross increases — tax positions in prior period	79	3
Gross increases — current period tax positions	80
Gross decreases — expirations in prior period	(321)		(113)
Gross decreases — tax positions in prior period			(1,015)
Settlements			(280)
Unrecognized tax benefits — December 31,	$ 471	$ 633	$ 630

Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Accrued liabilities	$ 9,785	$ 8,177
Tax credit carryforwards	2,366	391
Foreign NOLs	2,632	2,632
State NOLs	2,719	1,285
Investment in Yankee Environmental Services	441
Fuel hedges	71
Valuation allowance	(3,352)	(3,124)
Total deferred tax assets	14,662	9,361
Depreciation and amortization	(113,969)	(106,671)
Other liabilities	(1,975)
Investment in NASDI, LLC and Yankee Environmental Services		(942)
Fuel hedges		(179)
Total deferred tax liabilities	(115,944)	(107,792)
Net current deferred tax assets (included in other current assets)	5,485	5,921
Net noncurrent deferred tax liabilites	(106,767)	(104,352)
Net deferred tax liabilities	(101,282)	(98,431)
GLDD Corporation [Member]
Net noncurrent deferred tax liabilites	$ (106,144)	$ (103,959)

Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2012	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant						5,800,000
Allocated share-based compensation expense	$ 3,081		$ 3,081	$ 1,838	$ 2,094
Weighted-average grant-date fair value of options granted			$ 2.93	$ 2.23	$ 2.52
Total unrecognized compensation cost related to non-vested NQSOs and RSUs			$ 3,766
Total unrecognized compensation cost, weighted-average period of recognition			1 year 2 months 12 days
Amount related to shares used for tax withholding obligations			$ 231	$ 291
Shares of common stock received by employee directors				83	61
Annual retainer per non-employee director, percentage paid in cash			50.00%
Annual retainer per non-employee director, percentage paid in common stock			50.00%
Shares of common stock received by nonemployee directors			93
Nonemployee Director - Jonathan W. Berger [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock received by employee directors		16
Nonemployee Director - Bruce J. Biemick [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock received by employee directors		16
Chairman of the Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional compensation to annual retainer, paid in stock			$ 250
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual retainer per non-employee director				$ 155

Share-Based Compensation (Option Pricing Assumptions) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	55.00%	50.00%	50.00%
Expected dividends	1.30%	1.60%	1.20%
Risk free rate, minimum	0.70%	1.50%	2.20%
Risk free rate, maximum	1.00%	2.20%	2.80%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	5 years 6 months	5 years 6 months	5 years 6 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	6 years 6 months	6 years 6 months	6 years 6 months

Share-Based Compensation (Summary Of Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2012 USD ($) $ / shares shares
Share-Based Compensation [Abstract]
Options outstanding as of January 1, 2012 \| shares	1,259
Options granted \| shares	497
Options exercised \| shares	(102)
Options foreited or expired \| shares	(17)
Options outstanding as of December 31, 2012 \| shares	1,637
Options vested at December 31, 2012 \| shares	760
Options vested and expected to vest at December 31, 2012 \| shares	1,604
Weighted average exercise price outstanding as of January 1, 2012 \| $ / shares	$ 5.11
Weighted average exercise price, granted \| $ / shares	6.45
Weighted average exercise price, exercised \| $ / shares	4.50
Weighted average exercise price, forfeited or expired \| $ / shares	5.20
Weighted average exercise price outstanding as of December 31, 2012 \| $ / shares	5.56
Weighted avergage exercise price, vested at December 31, 2012 \| $ / shares	5.24
Weighted avergage exercise price, vested and expected to vest at December 31, 2012 \| $ / shares	$ 5.54
Weighted average remaining contractual term at December 31, 2012	8 years
Weighted average remaining contractual term, vested as of December 31, 2012	7 years 1 month 6 days
Weighted average remaining contractual term, vested and expected to vest as of December 31, 2012	8 years
Aggregate intrinsic value, outstanding as of December 31, 2012 \| $	$ 5,524
Aggregate intrinsic value, vested at December 31, 2012 \| $	4,355
Aggregate intrinsic value, vested and expected to vest at December 31, 2012 \| $	$ 5,430

Share-Based Compensation (Summary Of Non-Vested Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2012 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding as of January 1, 2012 \| shares	465
Options granted \| shares	307
Options vested \| shares	(127)
Options forfeited \| shares	(37)
Options outstanding as of December 31, 2012 \| shares	608
Options expected to vest \| shares	589
Weighted-average grant-date fair value as of January 1, 2012 \| $ / shares	$ 5.08
Weighted-average grant-date fair value, granted \| $ / shares	6.58
Weighted-average grant-date fair value, vested \| $ / shares	4.16
Weighted-average grant-date fair value, forfeited \| $ / shares	6.28
Weighted-average grant-date fair value as of December 31, 2012 \| $ / shares	5.96
Weighted-average grant-date fair value, expected to vest at December 31, 2012 \| $ / shares	$ 5.95

Retirement Plans (Narrative) (Details) $ in Thousands	12 Months Ended
Retirement Plans (Narrative) (Details) $ in Thousands	Dec. 31, 2012 USD ($) item	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Retirement Plans [Abstract]
Number of sponsored 401(k) plans \| item	4
Expense for matching and discretionary contributions \| $	$ 4,304	$ 3,942	$ 4,726

Retirement Plans (Schedule Of Multiemployer Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
International Union Of Operating Engineers Local 4 Pension Fund [Member]
Multiemployer Plans [Line Items]
Federal identification number	046013863
Pension Protection Act of 2006 certified zone status	Green	Green
Expiration of collective bargaining arrangement with the Company	May 31, 2014
Company's contributions	$ 829	$ 583	$ 624
Multiemployer Plans, Pension [Member] \| Multiemployer Plan, Plan Information, Available [Member]
Multiemployer Plans [Line Items]
Company's contributions	$ 9,914	$ 8,509	8,058
Multiemployer Plans, Pension [Member] \| Massachusetts Laborers Pension Fund [Member] \| Multiemployer Plan, Plan Information, Available [Member]
Multiemployer Plans [Line Items]
Federal identification number	046128298
Multiemployer plan number	001
Pension Protection Act of 2006 certified zone status	Yellow	Yellow
Multiemployer plans collective bargaining arrangements expiration date	Various dates in 2016
Company's contributions	$ 3,967	$ 3,423	3,084
Multiemployer Plans, Pension [Member] \| Central Pension Fund Of The IUOE And Participating Employees [Member] \| Multiemployer Plan, Plan Information, Available [Member]
Multiemployer Plans [Line Items]
Federal identification number	366052390
Multiemployer plan number	001
Pension Protection Act of 2006 certified zone status	Green	Green
Multiemployer plans collective bargaining arrangements expiration date	September 30, 2012
Company's contributions	$ 2,203	$ 1,759	2,141
Multiemployer Plans, Pension [Member] \| Excavators Union Local 731 Pension Fund [Member] \| Multiemployer Plan, Plan Information, Available [Member]
Multiemployer Plans [Line Items]
Federal identification number	131809825
Multiemployer plan number	002
Pension Protection Act of 2006 certified zone status	Green	Green
Expiration of collective bargaining arrangement with the Company	Jul. 30, 2014
Company's contributions	$ 1,014	$ 716	317
Multiemployer Plans, Pension [Member] \| Seafarers Pension Trust [Member] \| Multiemployer Plan, Plan Information, Available [Member]
Multiemployer Plans [Line Items]
Federal identification number	136100329
Multiemployer plan number	001
Pension Protection Act of 2006 certified zone status	Green	Green
Expiration of collective bargaining arrangement with the Company	Feb. 28, 2015
Company's contributions	$ 883	$ 699	943
Multiemployer Plans, Pension [Member] \| Other Pension Plans [Member] \| Multiemployer Plan, Plan Information, Available [Member]
Multiemployer Plans [Line Items]
Company's contributions	$ 1,018	$ 1,329	$ 949

Commitments And Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jan. 31, 2011
Commitments And Contingencies [Line Items]
Letters of credit outstanding	$ 35,663
Letter of credit remaining borrowing capacity	$ 139,337
Senior notes interest rate	7.375%			7.375%
Outstanding performance bonds	$ 614,523
Revenue value remaining from outstanding performance bonds	188,512
Senior Notes	250,000	$ 250,000		$ 250,000
Rent expense under long term operating lease arrangements	19,263	16,968	$ 17,397
Positive Outcome of Litigation [Member]
Commitments And Contingencies [Line Items]
Litigation settlement, amount, plus pre-judgment interest	11,736
Litigation settlement, amount	13,272
GLDD Corporation [Member]
Commitments And Contingencies [Line Items]
Senior Notes	250,000	$ 250,000
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range	10,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range	$ 1,000

Commitments And Contingencies (Future Minimum Operating Lease Payments) (Details) $ in Thousands	Dec. 31, 2012 USD ($)
Commitments And Contingencies [Abstract]
2013	$ 19,408
2014	18,285
2015	17,298
2016	16,589
2017	13,915
Thereafter	13,422
Total minimum operating lease payments	$ 98,917

Related-Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Related party expenses	$ 95
Beneficial Owner [Member]
Related Party Transaction [Line Items]
Amount of related party transaction	$ 449	$ 483	$ 312
Majority Shareholder [Member]
Related Party Transaction [Line Items]
Related party expenses		$ 103

Business Combinations And Reorganizations (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2011
Business Acquisition [Line Items]
Severance expenses		$ 6,428
Unpaid severance included in accrued expenses and other liabilities	$ 310		$ 2,335
Goodwill	100,799	98,049	98,049
Accrued Liabilities [Member]
Business Acquisition [Line Items]
Fair value of the earnout liability	647
Other Liabilities [Member]
Business Acquisition [Line Items]
Fair value of the earnout liability	989
Terra [Member]
Business Acquisition [Line Items]
Base purchase price	$ 26,000
Purchase agreement, multiplication factor	25.00%
Purchase agreement, base additional amount	$ 500
Purchase agreement, multiplication factor for amount exceeded	50.00%
Maximum earnout payment	$ 2,000,000
Fair value of the earnout liability	1,636
Seller note	10,547
Tangible assets acquired	27,000
Receivables	14,600
Property, plant, and equipment	11,300
Finite-lived intangible assets acquired	$ 2,700
Weighted average amortization period	4 years
Accounts payable	$ 18,300
Liabilities assumed	17,500
Goodwill	$ 2,800
Terra [Member] \| Backlog [Member]
Business Acquisition [Line Items]
Weighted average amortization period	1 year
Terra [Member] \| Other [Member]
Business Acquisition [Line Items]
Weighted average amortization period	5 years
L.W. Matteson, Inc. [Member]
Business Acquisition [Line Items]
Base purchase price		45
Additional purchase price		369
Purchase agreement, multiplication factor	15.00%
Purchase agreement, base additional amount	$ 450
Purchase agreement, multiplication factor for amount exceeded	25.00%
Cash paid in acquisition		37,500
Seller note		$ 7,500
L.W. Matteson, Inc. [Member] \| Other Liabilities [Member]
Business Acquisition [Line Items]
Fair value of the earnout liability	$ 0		$ 240
Maximum [Member]
Business Acquisition [Line Items]
Severance expenses, payout period	3 years
Maximum [Member] \| Terra [Member]
Business Acquisition [Line Items]
Purchase agreement, earnings before income taxes, depreciation and amortization, amount	$ 4,500,000
Maximum [Member] \| L.W. Matteson, Inc. [Member]
Business Acquisition [Line Items]
Purchase agreement, earnings before income taxes, depreciation and amortization, amount	$ 12,000
Minimum [Member]
Business Acquisition [Line Items]
Severance expenses, payout period	1 year
Minimum [Member] \| Terra [Member]
Business Acquisition [Line Items]
Purchase agreement, earnings before income taxes, depreciation and amortization, amount	$ 4,000,000
Minimum [Member] \| L.W. Matteson, Inc. [Member]
Business Acquisition [Line Items]
Purchase agreement, earnings before income taxes, depreciation and amortization, amount	$ 9,000

Business Combinations And Reorganizations (Summary Of Purchase Price Allocation) (Details) - L.W. Matteson, Inc. [Member] $ in Thousands	Dec. 31, 2010 USD ($)
Business Acquisition [Line Items]
Property, plant and equipment	$ 36,173
Inventories	4,637
Accounts receivable	4,173
Intangible assets	2,670
Other assets and liabilities-net	(644)
Total	$ 47,009

Business Combinations And Reorganizations (Unaudited Pro Forma Consolidated Financial Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 687,584	$ 627,333	$ 686,922
Revenue of purchased businesses for the period prior to acquisition			37,183
Pro forma revenue			724,105
Net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	(2,695)	16,528	34,609
Net income of L.W. Matteson, Inc., including pro forma purchase accounting adjustments			3,257
Pro forma net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation			37,866
GLDD Corporation [Member]
Net income attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$ (2,695)	$ 16,528	$ 34,609

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Segment Information (Narrative) (Details) $ in Thousands	12 Months Ended
Segment Information (Narrative) (Details) $ in Thousands	Dec. 31, 2012 USD ($) segment	Dec. 31, 2011 USD ($)	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	2
Long-lived assets, net book value	$ 88,003	$ 96,376
BH Government Agencies [Member] \| Sales [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	11.70%	7.60%	8.10%
Dredging [Member]
Segment Reporting Information [Line Items]
Segment reporting information, intersegment revenue	$ 1,374
Dredging [Member] \| Sales [Member] \| Federal Government Agencies [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	59.80%	43.10%	53.50%
Dredging [Member] \| Accounts Receivable [Member] \| Federal Government Agencies [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	26.00%	36.90%
Dredging [Member] \| Bahrain [Member] \| Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	19.60%	21.40%
Demolition [Member]
Segment Reporting Information [Line Items]
Segment reporting information, intersegment revenue	$ 75

Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Contract revenues	$ 687,584	$ 627,333	$ 686,922
Operating income (loss)	15,505	54,294	68,430
Depreciation and amortization	40,034	40,838	34,301
Total assets	826,395	788,460	693,825
Property and equipment — net	346,540	310,520	323,231
Goodwill	100,799	98,049	98,049
Investment in joint ventures	7,047	6,923	7,329
Capital expenditures	66,567	30,712	29,863
GLDD Corporation [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(3,240)	(3,363)	(3,566)
Total assets	677,161	699,355
Dredging [Member]
Segment Reporting Information [Line Items]
Contract revenues	586,855	520,134	608,969
Operating income (loss)	32,947	53,793	70,504
Depreciation and amortization	37,279	37,176	31,532
Total assets	757,666	742,292	646,158
Property and equipment — net	323,082	298,140	315,140
Goodwill	76,575	76,575	76,575
Investment in joint ventures	7,047	6,923	7,329
Capital expenditures	64,598	22,860	28,838
Demolition [Member]
Segment Reporting Information [Line Items]
Contract revenues	100,729	107,199	77,953
Operating income (loss)	(17,442)	501	(2,074)
Depreciation and amortization	2,755	3,662	2,769
Total assets	68,729	46,168	47,667
Property and equipment — net	23,458	12,380	8,091
Goodwill	24,224	21,474	21,474
Capital expenditures	$ 1,969	$ 7,852	$ 1,025

Segment Information (Dredging Revenue By Type Of Work) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Revenues	$ 687,584	$ 627,333	$ 686,922
Dredging [Member]
Revenue from External Customer [Line Items]
Revenues	586,855	520,134	608,969
Dredging [Member] \| Capital Dredging — U.S. [Member]
Revenue from External Customer [Line Items]
Revenues	175,317	156,251	300,873
Dredging [Member] \| Capital dredging — Foreign [Member]
Revenue from External Customer [Line Items]
Revenues	112,242	77,232	82,898
Dredging [Member] \| Beach Nourishment Dredging [Member]
Revenue from External Customer [Line Items]
Revenues	126,873	135,164	106,163
Dredging [Member] \| Maintenance Dredging [Member]
Revenue from External Customer [Line Items]
Revenues	136,550	116,016	$ 119,035
Dredging [Member] \| Rivers & Lakes [Member]
Revenue from External Customer [Line Items]
Revenues	$ 35,873	$ 35,471

Segment Information (Revenues And Gross Profit From Foreign Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Contract revenues	$ 687,584	$ 627,333	$ 686,922
Costs of contract revenues	(619,185)	(534,316)	(564,140)
GROSS PROFIT	68,399	93,017	122,782
Foreign [Member]
Revenue from External Customer [Line Items]
Contract revenues	112,242	77,232	82,898
Costs of contract revenues	(104,038)	(63,256)	(76,708)
GROSS PROFIT	$ 8,204	$ 13,976	$ 6,190

Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2011
Subsidiary Guarantors [Abstract]
Senior Notes	$ 250,000	$ 250,000	$ 250,000
Senior notes interest rate	7.375%		7.375%

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Cash and cash equivalents	$ 24,440	$ 113,288		$ 48,478	$ 3,250
Accounts receivable—net	149,142	120,268
Contract revenues in excess of billings	69,574	26,412
Inventories	28,726	33,426
Prepaid expenses	9,554	3,979
Other current assets	32,254	28,405
Total current assets	313,690	325,778
PROPERTY AND EQUIPMENT—Net	346,540	310,520		323,231
GOODWILL	100,799	98,049		98,049
GOODWILL AND OTHER INTANGIBLE	3,232	814
INVENTORIES—Noncurrent	37,392	30,103
INVESTMENTS IN JOINT VENTURES	7,047	6,923		7,329
OTHER	17,695	16,273
TOTAL	826,395	788,460		693,825
LIABILITIES AND EQUITY
Accounts payable	123,082	82,745
Accrued expenses	38,490	31,121
Billings in excess of contract revenues	11,280	13,627
Current portion of long term debt	13,098	3,033
Total current liabilities	185,950	130,526
LONG TERM NOTE PAYABLE		2,500
7 3/8% SENIOR NOTES	250,000	250,000	$ 250,000
DEFERRED INCOME TAXES	106,767	104,352
OTHER	10,253	8,545
Total liabilities	552,970	495,923
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	273,635	291,969
NONCONTROLLING INTERESTS	(210)	568
Total equity	273,425	292,537		276,825	244,549
TOTAL	826,395	788,460
GLDD Corporation [Member]
ASSETS
Receivables from affiliates	38,115	49,724
Prepaid expenses	102	132
Other current assets	14,531	16,198
Total current assets	52,748	66,054
INVESTMENTS IN SUBSIDIARIES	618,070	627,754
OTHER	6,343	5,547
TOTAL	677,161	699,355
LIABILITIES AND EQUITY
Payables to affiliates	38,647	44,053
Accrued expenses	8,396	8,047
Total current liabilities	47,043	52,100
7 3/8% SENIOR NOTES	250,000	250,000
DEFERRED INCOME TAXES	106,144	103,959
OTHER	549	759
Total liabilities	403,736	406,818
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	273,635	291,969
NONCONTROLLING INTERESTS	(210)	568
Total equity	273,425	292,537
TOTAL	677,161	699,355
Subsidiary Guarantors [Member]
ASSETS
Cash and cash equivalents	24,272	108,985		48,416	3,028
Accounts receivable—net	147,610	118,530
Receivables from affiliates	102,968	79,683
Contract revenues in excess of billings	69,649	26,323
Inventories	28,726	33,426
Prepaid expenses	9,452	3,847
Other current assets	17,695	12,082
Total current assets	400,372	382,876
PROPERTY AND EQUIPMENT—Net	346,503	310,459
GOODWILL	100,550	97,799
GOODWILL AND OTHER INTANGIBLE	3,137	675
INVENTORIES—Noncurrent	37,392	30,103
INVESTMENTS IN JOINT VENTURES	7,047	6,923
INVESTMENTS IN SUBSIDIARIES	2,127	4,385
OTHER	11,350	10,729
TOTAL	908,478	843,949
LIABILITIES AND EQUITY
Accounts payable	122,191	81,971
Payables to affiliates	105,303	85,865
Accrued expenses	29,417	22,445
Billings in excess of contract revenues	11,207	13,607
Current portion of long term debt	13,098	3,033
Total current liabilities	281,216	206,921
LONG TERM NOTE PAYABLE		2,500
DEFERRED INCOME TAXES	623	399
OTHER	9,704	7,786
Total liabilities	291,543	217,606
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	616,935	626,343
Total equity	616,935	626,343
TOTAL	908,478	843,949
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	168	4,303		$ 62	$ 222
Accounts receivable—net	1,532	1,738
Receivables from affiliates	7,680	7,729
Contract revenues in excess of billings	5	153
Other current assets	28	125
Total current assets	9,413	14,048
PROPERTY AND EQUIPMENT—Net	37	61
GOODWILL	249	250
GOODWILL AND OTHER INTANGIBLE	95	139
OTHER	2	3
TOTAL	9,796	14,501
LIABILITIES AND EQUITY
Accounts payable	891	774
Payables to affiliates	4,843	7,234
Accrued expenses	677	629
Billings in excess of contract revenues	123	68
Total current liabilities	6,534	8,705
Total liabilities	6,534	8,705
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	3,262	5,796
Total equity	3,262	5,796
TOTAL	9,796	14,501
Eliminations [Member]
ASSETS
Receivables from affiliates	(148,763)	(137,136)
Contract revenues in excess of billings	(80)	(64)
Total current assets	(148,843)	(137,200)
INVESTMENTS IN SUBSIDIARIES	(620,197)	(632,139)
OTHER		(6)
TOTAL	(769,040)	(769,345)
LIABILITIES AND EQUITY
Payables to affiliates	(148,793)	(137,152)
Billings in excess of contract revenues	(50)	(48)
Total current liabilities	(148,843)	(137,200)
DEFERRED INCOME TAXES		(6)
Total liabilities	(148,843)	(137,206)
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	(620,197)	(632,139)
Total equity	(620,197)	(632,139)
TOTAL	$ (769,040)	$ (769,345)

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 687,584	$ 627,333	$ 686,922
Costs of contract revenues	(619,185)	(534,316)	(564,140)
GROSS PROFIT	68,399	93,017	122,782
General and administrative expenses	53,459	50,434	54,352
Gain on sale of assets—net	(565)	(11,711)
Total operating income	15,505	54,294	68,430
Interest expense—net	(20,922)	(21,665)	(13,542)
Equity in earnings (loss) of joint ventures	124	(406)	(614)
Loss on foreign currency transactions—net	(118)	(282)
Loss on extinguishment of debt		(5,145)
INCOME BEFORE INCOME TAXES	(5,411)	26,796	54,274
Income tax (provision) benefit	2,071	(9,545)	(20,554)
NET INCOME	(3,340)	17,251	33,720
Net (income) loss attributable to noncontrolling interests	645	(723)	889
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	(2,695)	16,528	34,609
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(3,078)	16,174	34,427
GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
General and administrative expenses	3,145	3,352	3,566
Gain on sale of assets—net	95	11
Total operating income	(3,240)	(3,363)	(3,566)
Interest expense—net	(20,212)	(20,729)	(13,473)
Equity in earnings (loss) of subsidiaries	25,525	56,442	72,886
Loss on extinguishment of debt		(5,145)
INCOME BEFORE INCOME TAXES	2,073	27,205	55,847
Income tax (provision) benefit	(5,413)	(9,954)	(22,127)
NET INCOME	(3,340)	17,251	33,720
Net (income) loss attributable to noncontrolling interests	645	(723)	889
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	(2,695)	16,528	34,609
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(3,078)	16,174	34,427
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	686,280	619,643	683,460
Costs of contract revenues	(616,243)	(527,769)	(559,754)
GROSS PROFIT	70,037	91,874	123,706
General and administrative expenses	49,562	46,285	50,084
Gain on sale of assets—net	(660)	(11,722)
Total operating income	21,135	57,311	73,622
Interest expense—net	(577)	(780)	26
Equity in earnings (loss) of subsidiaries	(1,871)	2,075	(1,721)
Equity in earnings (loss) of joint ventures	124	(406)	(614)
Loss on foreign currency transactions—net	(118)	(264)
INCOME BEFORE INCOME TAXES	18,693	57,936	71,313
Income tax (provision) benefit	7,484	404	1,573
NET INCOME	26,177	58,340	72,886
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	26,177	58,340	72,886
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	25,800	57,986	72,704
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	7,844	19,941	8,538
Costs of contract revenues	(9,482)	(18,798)	(9,462)
GROSS PROFIT	(1,638)	1,143	(924)
General and administrative expenses	752	797	702
Total operating income	(2,390)	346	(1,626)
Interest expense—net	(133)	(156)	(95)
Loss on foreign currency transactions—net		(18)
INCOME BEFORE INCOME TAXES	(2,523)	172	(1,721)
Income tax (provision) benefit		5
NET INCOME	(2,523)	177	(1,721)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	(2,523)	177	(1,721)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(2,529)	177	(1,721)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(6,540)	(12,251)	(5,076)
Costs of contract revenues	6,540	12,251	5,076
Equity in earnings (loss) of subsidiaries	(23,654)	(58,517)	(71,165)
INCOME BEFORE INCOME TAXES	(23,654)	(58,517)	(71,165)
NET INCOME	(23,654)	(58,517)	(71,165)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	(23,654)	(58,517)	(71,165)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$ (23,271)	$ (58,163)	$ (70,983)

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES:
Net cash flows provided by (used in) by operating activities	$ (1,860)	$ 24,563	$ 123,531
INVESTING ACTIVITIES:
Purchases of property and equipment	(62,485)	(33,433)	(25,258)
Proceeds from dispositions of property and equipment	1,042	16,717	431
Purchase acquire business			(37,869)
Net cash flows used in investing activities	(63,443)	(16,716)	(62,696)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,962)
Repayment of long term note payable	(2,500)	(2,500)
Distributions paid to minority interests	(133)
Dividends paid	(18,560)	(4,711)	(3,988)
Dividend equivalents paid on restricted stock units	(196)	(36)	(24)
Taxes paid on settlement of vested share awards	(231)	(291)
Repayments of equipment debt	(543)	(1,911)	(1,251)
Exercise of stock options	461	27	656
Borrowings under revolving loans			14,968
Repayments of revolving loans			(25,968)
Excess income tax benefit from share-based compensation	189	55
Net cash flows provided by (used in) financing activities	(23,552)	57,407	(15,607)
Effect of foreign currency exchange rates on cash and cash equivalents	7	(444)
Net increase (decrease) in cash and cash equivalents	(88,848)	64,810	45,228
Cash and cash equivalents at beginning of period	113,288	48,478	3,250
Cash and cash equivalents at end of period	24,440	113,288	48,478
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) by operating activities	(27,824)	(25,818)	(32,691)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,962)
Distributions paid to minority interests	(133)
Dividends paid	(18,560)	(4,711)	(3,988)
Dividend equivalents paid on restricted stock units	(196)	(36)	(24)
Taxes paid on settlement of vested share awards	(231)	(291)
Net change in accounts with affiliates	48,333	(36,000)	47,703
Exercise of stock options	461	27
Borrowings under revolving loans			14,968
Repayments of revolving loans			(25,968)
Excess income tax benefit from share-based compensation	189	55
Net cash flows provided by (used in) financing activities	27,824	25,818	32,691
Matteson [Member]
INVESTING ACTIVITIES:
Purchase acquire business			(37,869)
Terra [Member]
INVESTING ACTIVITIES:
Purchase acquire business	(2,000)
Subsidiary Guarantors [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) by operating activities	27,755	51,145	157,248
INVESTING ACTIVITIES:
Purchases of property and equipment	(62,485)	(33,426)	(25,204)
Proceeds from dispositions of property and equipment	1,042	16,717	414
Net cash flows used in investing activities	(63,443)	(16,709)	(62,659)
FINANCING ACTIVITIES:
Repayment of long term note payable	(2,500)	(2,500)
Net change in accounts with affiliates	(45,982)	33,962	(48,606)
Capital contributions		(3,418)
Repayments of equipment debt	(543)	(1,911)	(1,251)
Exercise of stock options			656
Net cash flows provided by (used in) financing activities	(49,025)	26,133	(49,201)
Net increase (decrease) in cash and cash equivalents	(84,713)	60,569	45,388
Cash and cash equivalents at beginning of period	108,985	48,416	3,028
Cash and cash equivalents at end of period	24,272	108,985	48,416
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) by operating activities	(1,791)	(764)	(1,026)
INVESTING ACTIVITIES:
Purchases of property and equipment		(7)	(54)
Proceeds from dispositions of property and equipment			17
Net cash flows used in investing activities		(7)	(37)
FINANCING ACTIVITIES:
Net change in accounts with affiliates	(2,351)	2,038	903
Capital contributions		3,418
Net cash flows provided by (used in) financing activities	(2,351)	5,456	903
Effect of foreign currency exchange rates on cash and cash equivalents	7	(444)
Net increase (decrease) in cash and cash equivalents	(4,135)	4,241	(160)
Cash and cash equivalents at beginning of period	4,303	62	222
Cash and cash equivalents at end of period	$ 168	$ 4,303	$ 62

Schedule II—Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 1,839	$ 1,655	$ 1,250
Additions charged to costs and expenses	1,541	260	447
Deductions	(1,396)	(76)	(42)
Ending Balance	$ 1,984	$ 1,839	$ 1,655

Label	Element	Value
Escrow Account [Member]
Cash and cash equivalents	us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 6,489,000

- Definition

+ References

+ Details