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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2015	May 01, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
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		60,401,087

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 30,619	$ 42,389
Accounts receivable-net	75,348	113,188
Contract revenues in excess of billings	102,002	82,557
Inventories	32,870	34,735
Prepaid expenses and other current assets	79,643	69,375
Total current assets	320,482	342,244
PROPERTY AND EQUIPMENT-Net	418,839	399,445
GOODWILL AND OTHER INTANGIBLE ASSETS-Net	93,522	95,289
INVENTORIES-Noncurrent	36,555	36,262
INVESTMENTS IN JOINT VENTURES	7,726	7,889
OTHER	12,225	12,105
TOTAL	889,349	893,234
CURRENT LIABILITIES:
Accounts payable	102,361	119,971
Accrued expenses	58,034	70,041
Billings in excess of contract revenues	2,617	4,639
Current portion of long term debt	7,818	5,859
Total current liabilities	170,830	200,510
7 3/8% SENIOR NOTES	274,887	274,880
REVOLVING CREDIT FACILITY	20,000	49,497
NOTES PAYABLE	62,393	49,497
DEFERRED INCOME TAXES	92,137	92,007
OTHER	20,549	20,377
Total liabilities	640,796	637,271
COMMITMENTS AND CONTINGENCIES (Note 8)
EQUITY:
Common stock-$.0001 par value; 90,000 authorized, 60,379 and 60,170 shares issued and outstanding at March 30, 2015 and December 31, 2014, respectively.	6	6
Additional paid-in capital	279,954	278,166
Accumulated deficit	(29,865)	(21,475)
Accumulated other comprehensive loss	(1,542)	(734)
TOTAL EQUITY	248,553	255,963
TOTAL	$ 889,349	$ 893,234

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2015	Dec. 31, 2014
Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	60,379,000	60,170,000
Common stock, shares outstanding	60,379,000	60,170

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements Of Operations [Abstract]
Contract revenues	$ 174,557	$ 174,382
Costs of contract revenues	163,875	153,475
Gross profit	10,682	20,907
General and administrative expenses	17,948	17,870
(Gain) loss on sale of assets-net	(8)	152
Operating income (loss)	(7,258)	2,885
Interest expense-net	(5,630)	(5,016)
Equity in loss of joint ventures	(1,098)	(1,843)
Other income (expense)	(441)	65
Loss from continuing operations before income taxes	(14,427)	(3,909)
Income tax benefit	6,037	1,453
Loss from continuing operations	(8,390)	(2,456)
Loss from discontinued operations, net of income taxes		(2,739)
Net loss attributable to common stockholders of Great Lakes Dredge & Dock Corporation	$ (8,390)	$ (5,195)
Loss per share from continuing operations - basic	$ (0.14)	$ (0.04)
Basic loss per share attributable to discontinued operations, net of tax		(0.05)
Basic loss per share attributable to Great Lakes Dredge & Dock Corporation	$ (0.14)	$ (0.09)
Basic weighted average shares	60,265	59,708
Loss per share from continuing operations - diluted	$ (0.14)	$ (0.04)
Diluted loss per share attributable to discontinued operations, net of tax		(0.05)
Diluted loss per share attributable to Great Lakes Dredge & Dock Corporation	$ (0.14)	$ (0.09)
Diluted weighted average shares	60,265	59,708

Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]

Net loss

$ (8,390)

$ (5,195)

Currency translation adjustment-net of tax (1)

^[1]

(808)

(189)

Net unrealized gain on derivatives-net of tax

(289)

Net unrealized gain on derivatives-net of tax

(808)

(478)

Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation

$ (9,198)

$ (5,673)

[1]	Net of income tax (expense) benefit of $536 and $(126) for three months ended March 31, 2015 and 2014, respectively.

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Currency translation adjustment, tax	$ 536	$ (126)

Condensed Consolidated Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Total
BALANCE - value at Dec. 31, 2013	$ 6	$ 275,183	$ (31,770)	$ (473)	$ (845)	$ 242,101
BALANCE - shares at Dec. 31, 2013	59,670
Share-based compensation, Value		996				996
Share-based compensation, Shares	40
Exercise of options and purchases from employee stock plans, Value		415				415
Exercise of options and purchases from employee stock plans, Shares	74
Excess income tax benefit from share based compensation		4				4
Net loss			(5,195)			(5,195)
Other comprehensive loss-net of tax				(478)		(478)
BALANCE - value at Mar. 31, 2014	$ 6	275,610	(36,965)	(951)		237,700
BALANCE - shares at Mar. 31, 2014	59,784
Distributions paid to noncontrolling interests		(988)			$ 845	(143)
BALANCE - value at Dec. 31, 2014	$ 6	278,166	(21,475)	(734)		255,963
BALANCE - shares at Dec. 31, 2014	60,170
Share-based compensation, Value		1,057				1,057
Share-based compensation, Shares	67
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(13)				(13)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	3
Exercise of options and purchases from employee stock plans, Value		736				736
Exercise of options and purchases from employee stock plans, Shares	139
Excess income tax benefit from share based compensation		8				8
Net loss			(8,390)			(8,390)
Other comprehensive loss-net of tax				(808)		(808)
BALANCE - value at Mar. 31, 2015	$ 6	$ 279,954	$ (29,865)	$ (1,542)		$ 248,553
BALANCE - shares at Mar. 31, 2015	60,379

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net loss	$ (8,390)	$ (5,195)
Loss from discontinued operations, net of income taxes		(2,739)
Loss from continuing operations	(8,390)	(2,456)
Adjustments to reconcile net loss to net cash flows used in operating activities:
Depreciation and amortization	13,153	10,885
Equity in loss of joint ventures	1,098	1,843
Deferred income taxes	(6,045)	(3,125)
(Gain) loss on sale of assets	(8)	152
Amortization of deferred financing fees	492	288
Unrealized net loss from mark-to-market valuations of derivatives	(1,051)
Unrealized foreign currency gain	(736)	(188)
Share-based compensation expense	1,057	996
Excess income tax benefit from share based compensation	(8)	(4)
Changes in assets and liabilities:
Accounts receivable	37,746	30,390
Contract revenues in excess of billings	(20,160)	(25,457)
Inventories	1,572	(418)
Prepaid expenses and other current assets	(1,114)	12,684
Accounts payable and accrued expenses	(24,463)	(14,070)
Billings in excess of contract revenues	(2,245)	(1,793)
Other noncurrent assets and liabilities	(1,475)	(1,082)
Net cash flows provided by (used in) operating activities of continuing operations	(10,577)	8,645
Net cash flows used in operating activities of discontinued operations		(2,635)
Cash provided by (used in) operating activities	(10,577)	6,010
INVESTING ACTIVITIES:
Purchases of property and equipment	(20,777)	(21,631)
Proceeds from dispositions of property and equipment	40	64
Payments on vendor performance obligations		(3,100)
Net cash flows used in investing activities of continuing operations	(20,737)	(24,667)
Net cash flows used in investing activities of discontinued operations		(26)
Cash used in investing activities	(20,737)	(24,693)
FINANCING ACTIVITIES:
Deferred financing fees	(29)
Taxes paid on settlement of vested share awards	(13)
Repayment of long term note payable	(1,250)
Repayments of equipment debt	(214)
Proceeds from equipment debt	408
Purchase of noncontrolling interest		205
Exercise of options and purchases from employee stock plans	736	415
Excess income tax benefit from share-based compensation	8	4
Borrowings under revolving loans	53,000	40,000
Repayments of revolving loans	(33,000)	(38,000)
Net cash provided by financing activities	19,646	2,214
Effect of foreign currency exchange rates on cash and cash equivalents	(102)	(174)
Net decrease in cash and cash equivalents	(11,770)	(16,643)
Cash and cash equivalents at beginning of period	42,389	75,338
Cash and cash equivalents at end of period	30,619	58,695
Supplemental Cash Flow Information
Cash paid for interest	11,068	9,486
Cash paid (refunded) for income taxes	368	(12,449)
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 7,301	10,235
Purchase of noncontrolling interest		$ 988

Basis of presentation	3 Months Ended
Basis of presentation	Mar. 31, 2015
Basis of presentation
Basis of presentation	1. Basis of presentation The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Great Lakes Dredge & Dock Corporation and Subsidiaries (the “Company” or “Great Lakes”) and the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of March 31, 2015, and its results of operations for the three months ended March 31, 2015 and 2014 and cash flows for the three months ended March 31, 2015 and 2014 have been included. 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 20% to 22% 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. The Company has four operating segments that, through aggregation, comprise two reportable segments: dredging and environmental & remediation. 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. The Company performed its most recent annual test of impairment as of July 1, 2014 for the goodwill in both the dredging and environmental & remediation segments with no indication of goodwill impairment as of the test date. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2015. The condensed consolidated results of operations and comprehensive income for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board issued Accounting Standard Update No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers (Topic 606), which supersedes the existing revenue recognition requirements. ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 is effective for fiscal years beginning after December 15, 2016, including interim periods within that reporting period, which will be our first quarter of fiscal 2017. Early adoption is not permitted. A one year delay to the effective date of the standard is currently proposed. We are currently evaluating the impact of ASU 2014-09 on our consolidated financial statements.

Earnings per share

3 Months Ended

Mar. 31, 2015

Earnings per share [Abstract]

Earnings Per Share

2. 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 similarly 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 three months ended March 31, 2015 and 2014 the dilutive effect of 534 thousand and 789 thousand shares of stock options and restricted stock units, respectively, were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during these periods. The computations for basic and diluted loss per share from continuing operations are as follows:


	Three Months Ended
(shares in thousands)	March 31,
	2015		2014
Loss from continuing operations	$	(8,390)	$	(2,456)
Loss on discontinued operations, net of income taxes		-		(2,739)
Net loss		(8,390)		(5,195)

Weighted-average common shares outstanding — basic and diluted		60,265		59,708

Loss per share from continuing operations — basic	$	(0.14)	$	(0.04)
Loss per share from continuing operations — diluted	$	(0.14)	$	(0.04)

Accounts Receivable And Contracts In Progress

3 Months Ended

Mar. 31, 2015

Accounts Receivable And Contracts In Progress [Abstract]

Accounts Receivables And Contracts In Progress

3. Accounts receivable and contracts in progress

Accounts receivable at March 31, 2015 and December 31, 2014 are as follows:


	March 31,		December 31,
	2015		2014
Completed contracts	$	12,538	$	15,342
Contracts in progress		45,383		72,459
Retainage		19,445		27,371
		77,366		115,172
Allowance for doubtful accounts		(608)		(578)

Total accounts receivable—net	$	76,758	$	114,594

Current portion of accounts receivable—net	$	75,348	$	113,188
Long-term accounts receivable and retainage		1,410		1,406
Total accounts receivable—net	$	76,758	$	114,594

The components of contracts in progress at March 31, 2015 and December 31, 2014 are as follows:


	March 31,		December 31,
	2015		2014
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	496,995	$	833,368
Amounts billed		(408,324)		(759,877)
Costs and earnings in excess of billings for contracts in progress		88,671		73,491

Costs and earnings in excess of billings for completed contracts		13,331		9,066

Total contract revenues in excess of billings	$	102,002	$	82,557

Billings in excess of costs and earnings:
Amounts billed	$	(310,521)	$	(181,698)
Costs and earnings for contracts in progress		307,904		177,059

Total billings in excess of contract revenues	$	(2,617)	$	(4,639)

- 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 + Details

Accrued Expenses

3 Months Ended

Mar. 31, 2015

Accrued Expenses [Abstract]

Accrued Expenses

4. Accrued expenses

Accrued expenses at March 31, 2015 and December 31, 2014 are as follows:


	March 31,		December 31,
	2015		2014

Insurance	$	17,917	$	16,778
Accumulated deficit in joint ventures		10,383		10,383
Payroll and employee benefits		6,646		8,808
Income and other taxes		3,543		5,857
Interest		3,069		8,270
Fuel hedge contracts		1,978		3,029
Percentage of completion adjustment		1,096		1,870
Other		13,402		15,046
Total accrued expenses	$	58,034	$	70,041

Long-term Debt	3 Months Ended
Long-term Debt	Mar. 31, 2015
Long-term Debt [Abstract]
Long-Term Debt	5. Long-term debt 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, as subsequently amended, provides for a senior revolving credit facility in an aggregate principal amount of up to $210,000, 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 $15,000. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, and the Company being 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 Credit Agreement is collateralized by a substantial portion of the Company’s operating equipment with a net book value at March 31, 2015 of $160,113. Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the amended 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 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. 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. During a year, the Company frequently borrows and repays amounts under its revolving credit facility. As of March 31, 2015, the Company had $20,000 of borrowings on the revolver and $125,461 of letters of credit outstanding, resulting in $64,539 of availability under the Credit Agreement. At March 31, 2015, the Company was in compliance with its various financial covenants under its Credit Agreement. Term loan facility On November 4, 2014, the Company entered into a new senior secured term loan facility consisting of a term loan in an aggregate principal amount of $50,000 (the “Term Loan Facility”) pursuant to a Loan and Security Agreement (the “Loan Agreement”) by and among, the lenders party thereto from time to time and Bank of America, N.A., as administrative agent. Pursuant to the term loan, the Company borrowed an aggregate principal amount of $47,360. The proceeds from the Term Loan Facility will be used for the working capital and general corporate purposes of the Company, including to repay borrowings under the Credit Agreement made to finance the construction of the Company’s dual mode articulated tug/barge trailing suction hopper dredge. The Term Loan Facility has a term of 5 years. The borrowings under the Term Loan Facility bear interest at a fixed rate of 4.655% per annum. If an event of default occurs under the Loan Agreement, the interest rate will increase by 2.00% per annum during the continuance of such event of default. The Term Loan Facility provides for monthly amortization payments, payable in arrears, commencing on December 4, 2014, at an annual amount of (i) approximately 10% of the principal amount of the Term Loan Facility during the first two years of the term, (ii) approximately 20% of the principal amount of the Term Loan Facility during the third and fourth years of the term, and (iii) approximately 25% of the principal amount of the Term Loan Facility during the final year of the term, with the remainder due on the maturity date of the facility. In addition, the Company has usual and customary mandatory prepayment provisions and may optionally prepay the Term Loan Facility in whole or in part at any time, subject to a minimum prepayment amount. The Loan Agreement includes customary representations, affirmative and negative covenants and events of default for financings of this type and includes the same financial covenants that are currently set forth in the Credit Agreement. The Term Loan Facility is collateralized by a portion of the Company’s operating equipment with a net book value at March 31, 2015 of $49,039. Senior notes The Company has outstanding $275,000 of 7.375% senior notes due February 2019. There is an optional redemption on all notes. The redemption prices are 103.7% in 2015, 101.8% in 2016 and 100% in any year following, until the notes mature in 2019. Interest is paid semi-annually and principal is due at maturity. Other In conjunction with the acquisition of Magnus Pacific Corporation in the fourth quarter of 2014, the Company issued a secured promissory note which has an aggregate principal amount of $7,544 to the former owners of Magnus which has terms that could reduce the amount owed based on minimum EBITDA expectations. The secured promissory note accrues interest at a rate of 5% per annum and is due in equal installments on January 1, 2017 and 2018. The Company enters into note arrangements to finance certain vessels and ancillary equipment. At March 31, 2015 the Company financed the $15,569 acquisition of a vessel previously under an operating lease with a note bearing interest at 5.75% to maturity in 2023. The current portion of all equipment notes is $2,818. The long term portion is $14,470 and is included in Notes payable.

Fair Value Measurements

3 Months Ended

Mar. 31, 2015

Fair Value Measurements [Abstract]

Fair Value Measurements

6. 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 times, the Company holds certain derivative contracts that it uses to manage foreign currency risk or commodity price 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:

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 times, the Company holds certain derivative contracts that it uses to manage foreign currency risk and commodity price 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 March 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,978	$	-	$	1,978	$	-


				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	3,029	$	-	$	3,029	$	-

Foreign exchange contracts

The Company has exposure 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 March 31, 2015, there were no outstanding contracts.

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 domestic backlog.

As of March 31, 2015, 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 December 2015. As of March 31, 2015, there were 6.4 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through December 2015. Under these swap agreements, the Company will pay fixed prices ranging from $1.83 to $2.92 per gallon.

At March 31, 2015 and December 31, 2014, the fair value liability of the fuel hedge contracts was estimated to be $1,978 and $3,029, respectively, and is recorded in accrued expenses. Changes in the fair value of fuel hedge contracts being recorded in the Statement of Operations are recorded as cost of contract revenues. 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 fuel hedge contracts outstanding as of March 31, 2015 and December 31, 2014 is as follows:


		Fair Value at
		March 31,		December 31,
	Balance Sheet Location	2015		2014
Liability derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	1,978	$	3,029

Accumulated other comprehensive loss

Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows:


	Three Months Ended
	March 31,
	2015		2014
Cumulative translation adjustments—net of tax	$	(808)	$	(189)
Derivatives:
Reclassification of derivative gains to earnings—net of tax		-		(46)
Change in fair value of derivatives—net of tax		-		(243)
Net unrealized gain on derivatives—net of tax		-		(289)
Total other comprehensive loss	$	(808)	$	(478)

Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows:


		Three Months Ended
		March 31,
	Statement of Operations Location	2014
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	(77)
	Income tax provision		(31)
		$	(46)

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. Based on timing of the cash flows and comparison to current market interest rates, the carrying value of our senior revolving credit agreement approximates fair value. The Company entered into a senior secured term loan facility in November 2014 that approximates fair value based upon stable market interest rates and Company credit ratings from inception to year end. In January 2011 and again in November 2014, the Company issued a total of $275,000 of 7.375% senior notes due February 1, 2019, which were outstanding at March 31, 2015 (See Note 5). 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 $281,875 at March 31, 2015, 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 + Details

Share-Based Compensation	3 Months Ended
Share-Based Compensation	Mar. 31, 2015
Share-based compensation[Abstract]
Share-based Compensation	7. 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 5.8 million shares of common stock. In March 2015, the Company granted 662 thousand restricted stock units to certain employees pursuant to the plan. In addition, all non-employee directors on the Company’s board of directors are paid a portion of their board-related compensation in stock grants. Compensation cost charged to expense related to share-based compensation arrangements was $1,057 and $996, respectively, for the three months ended March 31, 2015 and 2014, respectively.

Commitments And Contingencies	3 Months Ended
Commitments And Contingencies	Mar. 31, 2015
Commitments And Contingencies [Abstract]
Commitments And Contingencies	8. Commitments and contingencies Commercial commitments Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some environmental & remediation projects. The Company has 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 March 31, 2015, the Company had outstanding performance bonds totaling approximately $1,164,253, of which $49,048 relates to projects accounted for in discontinued operations. The revenue value remaining in backlog related to the projects of continuing operations totaled approximately $493,501. In connection with the sale of our historical demolition business, the Company was obligated to keep in place the surety bonds on pending demolition projects for the period required under the respective contract for a project. 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 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. Two additional, similar lawsuits captioned Boozer v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02339, and Connors v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02450, were filed in the Northern District of Illinois on March 28, 2013, and April 2, 2013, respectively. These three actions were consolidated and recaptioned In re Great Lakes Dredge & Dock Corporation Securities Litigation, Case No. 1:13-cv-02115, on June 10, 2013. The plaintiffs filed an amended class action complaint on August 9, 2013, which the defendants moved to dismiss on October 8, 2013. After briefing and oral argument by the parties, the court entered an order on October 21, 2014 denying that motion to dismiss. The parties have reached an agreement in principle to settle this action. Once finalized, the settlement will be presented to the court for preliminary approval. The settlement is expected to be paid by insurance. On March 28, 2013, the Company was named as a nominal defendant, and its directors were named as defendants, in a shareholder derivative action in DuPage County Circuit Court in Illinois captioned Hammoud v. Berger et al., Case No. 2013CH001110. The lawsuit primarily alleges breaches of fiduciary duties related to allegedly 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, which exposed the Company to securities litigation. A second, similar lawsuit captioned The City of Haverhill Retirement System v. Leight et al., Case No. 1:13-cv-02470, was filed in the Northern District of Illinois on April 2, 2013 and was voluntarily dismissed on June 10, 2013. A third, similar lawsuit captioned St. Lucie County Fire District Firefighters Pension Trust Fund v. Leight et al., Case No. 13 CH 15483, was filed in Cook County Circuit Court in Illinois on July 8, 2013, and has since been transferred to DuPage County Circuit Court and consolidated with the Hammoud action. The Hammoud/St. Lucie plaintiffs have filed a consolidated amended complaint on December 9, 2013, but the action was otherwise stayed pending a ruling on the motion to dismiss the securities class action. A fourth, similar lawsuit (that additionally named one current and one former executive as defendants) captioned Griffin v. Berger et al., Case No. 1:13-cv-04907, was filed in the Northern District of Illinois on July 9, 2013. The Griffin action was also stayed pending a ruling on the motion to dismiss the securities class action. The parties have reached an agreement in principle to settle the pending actions. Once finalized, the settlement will be presented to the DuPage County Circuit Court for preliminary approval. The settlement is expected to be paid by insurance. On April 23, 2014, the Company completed the sale of NASDI, LLC (“NASDI”) and Yankee Environmental Services, LLC (“Yankee”), which together comprised the Company’s historical demolition business, to a privately owned demolition company. Under the terms of the divestiture, the Company retained certain pre-closing liabilities relating to the disposed business. Certain of these liabilities and a legal action brought by the Company to enforce the buyer’s obligations under the sale agreement are described below. In 2009, 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 waste disposal activities at an allegedly unpermitted disposal site owned by a third party with whom NASDI contracted for the disposal of waste materials in 2007 and 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. Should a claim be brought, the Company intends to defend this matter vigorously. On January 14, 2015, the Company and our subsidiary, NASDI Holdings, LLC, brought an action in the Delaware Court of Chancery to enforce the terms of the Company's agreement to sell NASDI and Yankee. Under the terms of the agreement, the Company received cash of $5,309 and retained the right to receive additional proceeds based upon future collections of outstanding accounts receivable and work in process existing at the date of close. The Company seeks specific performance of buyer’s obligation to collect and to remit the additional proceeds, and other related relief. Defendants have filed counterclaims alleging that the Company misrepresented the quality of its contracts and receivables prior to the sale. The Company denies defendants’ allegations and intends to vigorously defend against the counterclaims. In 2012, the Company contracted with a shipyard to perform the functional design drawings, detailed design drawings and follow on construction of a new Articulated Tug & Barge (“ATB”) Trailing Suction Hopper Dredge. In April 2013, the Company terminated the contract with the shipyard for default and the counterparty sent the Company a notice requesting arbitration under the contract with respect to the Company’s termination for default, including but not limited to the Company’s right to draw on letters of credit that had been issued by the shipyard as financial security required by the contract. In May 2013, the Company drew upon the shipyard’s letters of credit related to the contract and received $13,600. Arbitration proceedings were initiated. In January 2014, the Company and the shipyard executed a settlement agreement pursuant to which the Company retained $10,500 of the proceeds of the financial security and remitted $3,100 of those funds to the shipyard, all other claims were released, and the arbitration was dismissed with prejudice. 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.

Investments	3 Months Ended
Investments	Mar. 31, 2015
Investments [Abstract]
Investments	9. Investments TerraSea Environmental Solutions The Company owns 50% of TerraSea Environmental Solutions (“TerraSea”) as a joint venture. TerraSea is engaged in the environmental services business through its ability to remediate contaminated soil and dredged sediment treatment. At March 31, 2015 and December 31, 2014, the Company has net advances to TerraSea of $25,005 and $22,898, respectively, which are recorded in other current assets. The Company has an accumulated deficit in joint ventures, which represents losses recognized to date in excess of our investment in TerraSea, of $10,383 at March 31, 2015 and December 31, 2014, which is presented in accrued expenses. The Company has commenced the winddown of TerraSea with its joint venture partner. The Company believes its net advances to TerraSea are ultimately recoverable either through the operations of the joint venture or as an obligation of our joint venture partner. To the extent that advances are not fully recoverable, additional losses may result in future periods. The Company and its joint venture partner remain obligated to fund TerraSea through the completion of its remaining project, which is expected to occur in 2015. Amboy Aggregates The Company and a New Jersey aggregates company each own 50% of Amboy Aggregates (“Amboy”). Amboy was formed in December 1984 to mine sand from the entrance channel to New York Harbor to provide sand and aggregate for use in road and building construction and for clean land fill. Amboy sold its interest in a stone import business and its holdings in land, owned in conjunction with Lower Main Street Development, LLC, during 2014 and is winding down operations.

Business Dispositions

3 Months Ended

Mar. 31, 2015

Business Dispositions [Abstract]

Business Combinations And Reorganizations

10. Business dispositions

On April 23, 2014, the Company entered into an agreement and completed the sale of NASDI, LLC and Yankee Environmental Services, LLC, its two former subsidiaries that comprised our historical demolition business. Under the terms of the agreement, the Company received cash of $5,309 and retained the right to receive additional proceeds based upon future collections of outstanding accounts receivable and work in process existing at the date of close, including recovery of outstanding claims for additional compensation from customers, net of future payments of accounts payable existing at the date of close, including any future payments of obligations associated with outstanding claims. In the fourth quarter of 2013, the Company recorded a preliminary loss on disposal of assets held for sale in discontinued operations. The loss on disposal is subject to change based on the value of additional proceeds received on the working capital existing at the date of disposition. The amount and timing of the working capital settlement and the amount and timing of the realization of additional net proceeds may be impacted by the litigation with the buyer of the historical demolition business (see Note 8). However, management believes that the ultimate resolution of these matters will not be material to the Company’s consolidated financial position or results of operations. The results of the businesses have been reported in discontinued operations as follows:


	Three Months Ended
	March 31,
	2014

Revenue	$	12,124

Loss before income taxes from discontinued operations	$	(9,620)
Income tax benefit		6,881
Loss from discontinued operations, net of income taxes	$	(2,739)

Segment Information

3 Months Ended

Mar. 31, 2015

Segment Information [Abstract]

Segment Information

11. Segment information

The Company and its subsidiaries currently operate in two reportable segments: dredging and environmental & remediation. 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. Segment information for the periods presented is provided as follows:


	Three Months Ended
	March 31,
	2015		2014
Dredging
Contract revenues	$	154,128	$	161,960
Operating income		7,874		7,429

Environmental & remediation
Contract revenues	$	21,552	$	12,730
Operating loss		(15,132)		(4,544)

Intersegment revenues		(1,123)		(308)
Total
Contract revenues	$	174,557	$	174,382
Operating income (loss)		(7,258)		2,885

Foreign dredging revenue of $41,699 for the three months ended March 31, 2015, was primarily attributable to work done in the Middle East and Brazil. Foreign dredging revenue for the three months ended March 31, 2014 was $16,470.

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.

- 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
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
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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
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Reference 5: 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=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 26
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 35
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 42
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-Name Accounting Standards Codification
-Topic 280
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 31
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

+ Details

Subsidiary Guarantors

3 Months Ended

Mar. 31, 2015

Subsidiary Guarantors [Abstract]

Subsidiary Guarantors

12. Subsidiary guarantors

The Company’s long-term debt at March 31, 2015 includes $275,000 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 March 31, 2015 and December 31, 2014;


	(ii)	statements of operations and comprehensive loss for the three months ended March 31, 2015 and 2014; and

(iii)

statements of cash flows for the three months ended March 31, 2015 and 2014.


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF MARCH 31, 2015
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	29,268	$	1,349	$	2	$	-	$	30,619
Accounts receivable — net		77,237		258		-		(2,147)		75,348
Contract revenues in excess of billings		99,307		3,131		-		(436)		102,002
Inventories		32,870		-		-		-		32,870
Prepaid expenses and other current assets		57,921		396		21,326		-		79,643
Total current assets		296,603		5,134		21,328		(2,583)		320,482

PROPERTY AND EQUIPMENT—Net		418,819		20		-		-		418,839
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		93,522		-		-		-		93,522
INVENTORIES — Noncurrent		36,555		-		-		-		36,555
INVESTMENTS IN JOINT VENTURES		7,726		-		-		-		7,726
RECEIVABLES FROM AFFILIATES		24,037		3,671		80,631		(108,339)		-
INVESTMENTS IN SUBSIDIARIES		3,725		-		618,369		(622,094)		-
OTHER		7,603		3		4,619		-		12,225
TOTAL	$	888,590	$	8,828	$	724,947	$	(733,016)	$	889,349

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	103,231	$	1,566	$	147	$	(2,583)	$	102,361
Accrued expenses		54,528		202		3,304		-		58,034
Billings in excess of contract revenues		2,394		223		-		-		2,617
Current portion of long term debt		865		-		6,953		-		7,818
Total current liabilities		161,018		1,991		10,404		(2,583)		170,830

7 3/8% SENIOR NOTES		-		-		274,887		-		274,887
REVOLVING CREDIT FACILITY		-		-		20,000		-		20,000
NOTES PAYABLE		7,653		-		54,740		-		62,393
DEFERRED INCOME TAXES		(369)		-		92,506		-		92,137
PAYABLES TO AFFILIATES		84,193		728		23,418		(108,339)		-
OTHER		20,110		-		439		-		20,549
Total liabilities		272,605		2,719		476,394		(110,922)		640,796

TOTAL EQUITY		615,985		6,109		248,553		(622,094)		248,553
TOTAL	$	888,590	$	8,828	$	724,947	$	(733,016)	$	889,349


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2014
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	41,724	$	663	$	2	$	-	$	42,389
Accounts receivable — net		115,739		355		-		(2,906)		113,188
Receivables from affiliates		152,822		3,673		55,805		(212,300)		-
Contract revenues in excess of billings		78,631		4,236		-		(310)		82,557
Inventories		34,735		-		-		-		34,735
Prepaid expenses and other current assets		54,327		431		14,617		-		69,375
Total current assets		477,978		9,358		70,424		(215,516)		342,244

PROPERTY AND EQUIPMENT—Net		399,421		24		-		-		399,445
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		95,289		-		-		-		95,289
INVENTORIES — Noncurrent		36,262		-		-		-		36,262
INVESTMENTS IN JOINT VENTURES		7,889		-		-		-		7,889
INVESTMENTS IN SUBSIDIARIES		3,757		-		619,220		(622,977)		-
OTHER		7,135		3		4,967		-		12,105
TOTAL	$	1,027,731	$	9,385	$	694,611	$	(838,493)	$	893,234

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	121,282	$	1,389	$	516	$	(3,216)	$	119,971
Payables to affiliates		196,829		403		15,068		(212,300)		-
Accrued expenses		60,415		659		8,967		-		70,041
Billings in excess of contract revenues		4,639		-		-		-		4,639
Current portion of long term debt		859		-		5,000		-		5,859
Total current liabilities		384,024		2,451		29,551		(215,516)		200,510

7 3/8% SENIOR NOTES		-		-		274,880		-		274,880
NOTE PAYABLE		7,553		-		41,944		-		49,497
DEFERRED INCOME TAXES		172		-		91,835		-		92,007
OTHER		19,939		-		438		-		20,377
Total liabilities		411,688		2,451		438,648		(215,516)		637,271

TOTAL EQUITY		616,043		6,934		255,963		(622,977)		255,963
TOTAL	$	1,027,731	$	9,385	$	694,611	$	(838,493)	$	893,234


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED MARCH 31, 2015
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	172,354	$	3,192	$	-	$	(989)	$	174,557
Costs of contract revenues		(161,204)		(3,660)		-		989		(163,875)
Gross profit		11,150		(468)		-		-		10,682

OPERATING EXPENSES:
General and administrative expenses		17,948		-		-		-		17,948
(Gain) loss on sale of assets—net		(8)		-		-		-		(8)
Operating loss		(6,790)		(468)		-		-		(7,258)

Interest expense—net		(299)		-		(5,331)		-		(5,630)
Equity in earnings (loss) of subsidiaries		4		-		(9,177)		9,173		-
Equity in loss of joint ventures		(1,098)		-		-		-		(1,098)
Gain on bargain purchase acquisition		-		-		-		-		-
Other income		(434)		(7)		-		-		(441)

Income (loss) before income taxes		(8,617)		(475)		(14,508)		9,173		(14,427)

Income tax (provision) benefit		-		(81)		6,118		-		6,037

Income (loss)	$	(8,617)	$	(556)	$	(8,390)	$	9,173	$	(8,390)


Comprehensive income (loss)	$	(8,617)	$	(1,364)	$	(9,198)	$	9,981	$	(9,198)


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED MARCH 31, 2014
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	173,322	$	6,029	$	-	$	(4,969)	$	174,382
Costs of contract revenues		(150,737)		(7,707)		-		4,969		(153,475)
Gross profit		22,585		(1,678)		-		-		20,907

OPERATING EXPENSES:
General and administrative expenses		17,870		-		-		-		17,870
Gain on sale of assets—net		152		-		-		-		152
Operating income (loss)		4,563		(1,678)		-		-		2,885

Interest expense—net		69		(129)		(4,956)		-		(5,016)
Equity in earnings (loss) of subsidiaries		(1,143)		-		3,505		(2,362)		-
Equity in loss of joint ventures		(1,843)		-		-		-		(1,843)
Other income		58		7		-		-		65

Income (loss) from continuing operations before income taxes		1,704		(1,800)		(1,451)		(2,362)		(3,909)

Income tax benefit		480		-		973		-		1,453

Income (loss) from continuing operations		2,184		(1,800)		(478)		(2,362)		(2,456)
Loss from discontinued operations, net of income taxes		(2,868)		(1,024)		(4,717)		5,870		(2,739)
Net income (loss)	$	(684)	$	(2,824)	$	(5,195)	$	3,508	$	(5,195)

Comprehensive loss	$	(973)	$	(3,013)	$	(5,673)	$	3,986	$	(5,673)


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2015
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(2,484)	$	155	$	(8,248)	$	-	$	(10,577)

INVESTING ACTIVITIES:
Purchases of property and equipment		(20,777)		-		-		-		(20,777)
Proceeds from dispositions of property and equipment		40		-		-		-		40
Payments on vendor performance obligations		-		-		-		-		-
Payments for acquisitions of businesses		-		-		-		-		-
Net change in accounts with affiliates		9,748		-		-		(9,748)		-
Net cash flows used in investing activities		(10,989)		-		-		(9,748)		(20,737)

FINANCING ACTIVITIES:
Deferred financing fees		-		-		(29)		-		(29)
Taxes paid on settlement of vested share awards		-		-		(13)		-		(13)
Repayments of term loan facility		-		-		(1,250)		-		(1,250)
Repayments of equipment debt		(214)		-		-		-		(214)
Proceeds from equipment debt		(15,569)		-		15,977		-		408
Net change in accounts with affiliates		-		633		(10,381)		9,748		-
Capital contributions		16,800		-		(16,800)		-		-
Exercise of options and purchases from employee stock plans		-		-		736		-		736
Excess income tax benefit from share-based compensation		-		-		8		-		8
Borrowings under revolving loans		-		-		53,000		-		53,000
Repayments of revolving loans		-		-		(33,000)		-		(33,000)

Net cash flows provided by financing activities		1,017		633		8,248		9,748		19,646

Effect of foreign currency exchange rates on cash and cash equivalents		-		(102)		-		-		(102)

Net increase (decrease) in cash and cash equivalents		(12,456)		686		-		-		(11,770)

Cash and cash equivalents at beginning of period		41,724		663		2		-		42,389

Cash and cash equivalents at end of period	$	29,268	$	1,349	$	2	$	-	$	30,619


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2014
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	$	11,746	$	(2,094)	$	(1,007)	$	-	$	8,645
Net cash flows used in operating activities of discontinued operations		(1,611)		(1,024)		-		-		(2,635)
Cash provided by (used in) operating activities		10,135		(3,118)		(1,007)		-		6,010

INVESTING ACTIVITIES:
Purchases of property and equipment		(21,631)		-		-		-		(21,631)
Proceeds from dispositions of property and equipment		64		-		-		-		64
Proceeds from vendor performance obligations		(3,100)		-		-		-		(3,100)
Net change in accounts with affiliates		(722)		-		-		722		-

Net cash flows used in investing activities of continuing operations		(25,389)		-		-		722		(24,667)
Net cash flows used in investing activities of discontinued operations		(26)		-		-		-		(26)
Cash used in investing activities		(25,415)		-		-		722		(24,693)

FINANCING ACTIVITIES:
Purchase of noncontrolling interest		-		-		(205)		-		(205)
Taxes paid on settlement of vested share awards		-		-		-		-		-
Repayment of equipment debt		-		-		-		-		-
Net change in accounts with affiliates		-		1,864		(1,142)		(722)		-
Exercise of options and purchases from employee stock plans		-		-		415		-		415
Excess income tax benefit from share-based compensation		-		-		4		-		4
Borrowings under revolving loans		-		-		40,000		-		40,000
Repayments of revolving loans		-		-		(38,000)		-		(38,000)

Cash provided by financing activities		-		1,864		1,072		(722)		2,214

Effect of foreign currency exchange rates on cash and cash equivalents		-		(174)		-		-		(174)

Net increase (decrease) in cash and cash equivalents		(15,280)		(1,428)		65		-		(16,643)

Cash and cash equivalents at beginning of period		71,939		3,399		-		-		75,338

Cash and cash equivalents at end of period	$	56,659	$	1,971	$	65	$	-	$	58,695

Earnings per share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings per share [Abstract]

Computations For Basic And Diluted Earnings Per Share


	Three Months Ended
(shares in thousands)	March 31,
	2015		2014
Loss from continuing operations	$	(8,390)	$	(2,456)
Loss on discontinued operations, net of income taxes		-		(2,739)
Net loss		(8,390)		(5,195)

Weighted-average common shares outstanding — basic and diluted		60,265		59,708

Loss per share from continuing operations — basic	$	(0.14)	$	(0.04)
Loss per share from continuing operations — diluted	$	(0.14)	$	(0.04)

Accounts Receivable And Contracts In Progress (Tables)

3 Months Ended

Mar. 31, 2015

Accounts Receivable And Contracts In Progress [Abstract]

Schedule Of Accounts Receivable


	March 31,		December 31,
	2015		2014
Completed contracts	$	12,538	$	15,342
Contracts in progress		45,383		72,459
Retainage		19,445		27,371
		77,366		115,172
Allowance for doubtful accounts		(608)		(578)

Total accounts receivable—net	$	76,758	$	114,594

Current portion of accounts receivable—net	$	75,348	$	113,188
Long-term accounts receivable and retainage		1,410		1,406
Total accounts receivable—net	$	76,758	$	114,594

Components Of Contracts In Progress


	March 31,		December 31,
	2015		2014
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	496,995	$	833,368
Amounts billed		(408,324)		(759,877)
Costs and earnings in excess of billings for contracts in progress		88,671		73,491

Costs and earnings in excess of billings for completed contracts		13,331		9,066

Total contract revenues in excess of billings	$	102,002	$	82,557

Billings in excess of costs and earnings:
Amounts billed	$	(310,521)	$	(181,698)
Costs and earnings for contracts in progress		307,904		177,059

Total billings in excess of contract revenues	$	(2,617)	$	(4,639)

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2015

Accrued Expenses [Abstract]

Accrued Expenses


	March 31,		December 31,
	2015		2014

Insurance	$	17,917	$	16,778
Accumulated deficit in joint ventures		10,383		10,383
Payroll and employee benefits		6,646		8,808
Income and other taxes		3,543		5,857
Interest		3,069		8,270
Fuel hedge contracts		1,978		3,029
Percentage of completion adjustment		1,096		1,870
Other		13,402		15,046
Total accrued expenses	$	58,034	$	70,041

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Measurements [Abstract]

Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date

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 times, the Company holds certain derivative contracts that it uses to manage foreign currency risk and commodity price 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 March 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,978	$	-	$	1,978	$	-


				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	3,029	$	-	$	3,029	$	-

Schedule Fair Value Measurements Balance Sheet Location


		Fair Value at
		March 31,		December 31,
	Balance Sheet Location	2015		2014
Liability derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	1,978	$	3,029

Changes In Components Of Accumulated other comprehensive loss (Table)


	Three Months Ended
	March 31,
	2015		2014
Cumulative translation adjustments—net of tax	$	(808)	$	(189)
Derivatives:
Reclassification of derivative gains to earnings—net of tax		-		(46)
Change in fair value of derivatives—net of tax		-		(243)
Net unrealized gain on derivatives—net of tax		-		(289)
Total other comprehensive loss	$	(808)	$	(478)

Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings


		Three Months Ended
		March 31,
	Statement of Operations Location	2014
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	(77)
	Income tax provision		(31)
		$	(46)

Business Dispositions (Tables)

3 Months Ended

Mar. 31, 2015

Business Dispositions [Abstract]

Schedule Of Discontinued Operation


	Three Months Ended
	March 31,
	2014

Revenue	$	12,124

Loss before income taxes from discontinued operations	$	(9,620)
Income tax benefit		6,881
Loss from discontinued operations, net of income taxes	$	(2,739)

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

+ References + Details

Segment Information (Tables)

3 Months Ended

Mar. 31, 2015

Segment Information [Abstract]

Segment Reporting By Segment


	Three Months Ended
	March 31,
	2015		2014
Dredging
Contract revenues	$	154,128	$	161,960
Operating income		7,874		7,429

Environmental & remediation
Contract revenues	$	21,552	$	12,730
Operating loss		(15,132)		(4,544)

Intersegment revenues		(1,123)		(308)
Total
Contract revenues	$	174,557	$	174,382
Operating income (loss)		(7,258)		2,885

Subsidiary Guarantors (Tables)

3 Months Ended

Mar. 31, 2015

Subsidiary Guarantors [Abstract]

Condensed Consolidating of Balance Sheet


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF MARCH 31, 2015
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	29,268	$	1,349	$	2	$	-	$	30,619
Accounts receivable — net		77,237		258		-		(2,147)		75,348
Contract revenues in excess of billings		99,307		3,131		-		(436)		102,002
Inventories		32,870		-		-		-		32,870
Prepaid expenses and other current assets		57,921		396		21,326		-		79,643
Total current assets		296,603		5,134		21,328		(2,583)		320,482

PROPERTY AND EQUIPMENT—Net		418,819		20		-		-		418,839
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		93,522		-		-		-		93,522
INVENTORIES — Noncurrent		36,555		-		-		-		36,555
INVESTMENTS IN JOINT VENTURES		7,726		-		-		-		7,726
RECEIVABLES FROM AFFILIATES		24,037		3,671		80,631		(108,339)		-
INVESTMENTS IN SUBSIDIARIES		3,725		-		618,369		(622,094)		-
OTHER		7,603		3		4,619		-		12,225
TOTAL	$	888,590	$	8,828	$	724,947	$	(733,016)	$	889,349

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	103,231	$	1,566	$	147	$	(2,583)	$	102,361
Accrued expenses		54,528		202		3,304		-		58,034
Billings in excess of contract revenues		2,394		223		-		-		2,617
Current portion of long term debt		865		-		6,953		-		7,818
Total current liabilities		161,018		1,991		10,404		(2,583)		170,830

7 3/8% SENIOR NOTES		-		-		274,887		-		274,887
REVOLVING CREDIT FACILITY		-		-		20,000		-		20,000
NOTES PAYABLE		7,653		-		54,740		-		62,393
DEFERRED INCOME TAXES		(369)		-		92,506		-		92,137
PAYABLES TO AFFILIATES		84,193		728		23,418		(108,339)		-
OTHER		20,110		-		439		-		20,549
Total liabilities		272,605		2,719		476,394		(110,922)		640,796

TOTAL EQUITY		615,985		6,109		248,553		(622,094)		248,553
TOTAL	$	888,590	$	8,828	$	724,947	$	(733,016)	$	889,349


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2014
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	41,724	$	663	$	2	$	-	$	42,389
Accounts receivable — net		115,739		355		-		(2,906)		113,188
Receivables from affiliates		152,822		3,673		55,805		(212,300)		-
Contract revenues in excess of billings		78,631		4,236		-		(310)		82,557
Inventories		34,735		-		-		-		34,735
Prepaid expenses and other current assets		54,327		431		14,617		-		69,375
Total current assets		477,978		9,358		70,424		(215,516)		342,244

PROPERTY AND EQUIPMENT—Net		399,421		24		-		-		399,445
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		95,289		-		-		-		95,289
INVENTORIES — Noncurrent		36,262		-		-		-		36,262
INVESTMENTS IN JOINT VENTURES		7,889		-		-		-		7,889
INVESTMENTS IN SUBSIDIARIES		3,757		-		619,220		(622,977)		-
OTHER		7,135		3		4,967		-		12,105
TOTAL	$	1,027,731	$	9,385	$	694,611	$	(838,493)	$	893,234

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	121,282	$	1,389	$	516	$	(3,216)	$	119,971
Payables to affiliates		196,829		403		15,068		(212,300)		-
Accrued expenses		60,415		659		8,967		-		70,041
Billings in excess of contract revenues		4,639		-		-		-		4,639
Current portion of long term debt		859		-		5,000		-		5,859
Total current liabilities		384,024		2,451		29,551		(215,516)		200,510

7 3/8% SENIOR NOTES		-		-		274,880		-		274,880
NOTE PAYABLE		7,553		-		41,944		-		49,497
DEFERRED INCOME TAXES		172		-		91,835		-		92,007
OTHER		19,939		-		438		-		20,377
Total liabilities		411,688		2,451		438,648		(215,516)		637,271

TOTAL EQUITY		616,043		6,934		255,963		(622,977)		255,963
TOTAL	$	1,027,731	$	9,385	$	694,611	$	(838,493)	$	893,234

Schedule Of Condensed Consolidating Operations And Comprehensive Income


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED MARCH 31, 2015
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	172,354	$	3,192	$	-	$	(989)	$	174,557
Costs of contract revenues		(161,204)		(3,660)		-		989		(163,875)
Gross profit		11,150		(468)		-		-		10,682

OPERATING EXPENSES:
General and administrative expenses		17,948		-		-		-		17,948
(Gain) loss on sale of assets—net		(8)		-		-		-		(8)
Operating loss		(6,790)		(468)		-		-		(7,258)

Interest expense—net		(299)		-		(5,331)		-		(5,630)
Equity in earnings (loss) of subsidiaries		4		-		(9,177)		9,173		-
Equity in loss of joint ventures		(1,098)		-		-		-		(1,098)
Gain on bargain purchase acquisition		-		-		-		-		-
Other income		(434)		(7)		-		-		(441)

Income (loss) before income taxes		(8,617)		(475)		(14,508)		9,173		(14,427)

Income tax (provision) benefit		-		(81)		6,118		-		6,037

Income (loss)	$	(8,617)	$	(556)	$	(8,390)	$	9,173	$	(8,390)


Comprehensive income (loss)	$	(8,617)	$	(1,364)	$	(9,198)	$	9,981	$	(9,198)


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED MARCH 31, 2014
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	173,322	$	6,029	$	-	$	(4,969)	$	174,382
Costs of contract revenues		(150,737)		(7,707)		-		4,969		(153,475)
Gross profit		22,585		(1,678)		-		-		20,907

OPERATING EXPENSES:
General and administrative expenses		17,870		-		-		-		17,870
Gain on sale of assets—net		152		-		-		-		152
Operating income (loss)		4,563		(1,678)		-		-		2,885

Interest expense—net		69		(129)		(4,956)		-		(5,016)
Equity in earnings (loss) of subsidiaries		(1,143)		-		3,505		(2,362)		-
Equity in loss of joint ventures		(1,843)		-		-		-		(1,843)
Other income		58		7		-		-		65

Income (loss) from continuing operations before income taxes		1,704		(1,800)		(1,451)		(2,362)		(3,909)

Income tax benefit		480		-		973		-		1,453

Income (loss) from continuing operations		2,184		(1,800)		(478)		(2,362)		(2,456)
Loss from discontinued operations, net of income taxes		(2,868)		(1,024)		(4,717)		5,870		(2,739)
Net income (loss)	$	(684)	$	(2,824)	$	(5,195)	$	3,508	$	(5,195)

Comprehensive loss	$	(973)	$	(3,013)	$	(5,673)	$	3,986	$	(5,673)

Condensed Cash Flow Statement


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2015
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(2,484)	$	155	$	(8,248)	$	-	$	(10,577)

INVESTING ACTIVITIES:
Purchases of property and equipment		(20,777)		-		-		-		(20,777)
Proceeds from dispositions of property and equipment		40		-		-		-		40
Payments on vendor performance obligations		-		-		-		-		-
Payments for acquisitions of businesses		-		-		-		-		-
Net change in accounts with affiliates		9,748		-		-		(9,748)		-
Net cash flows used in investing activities		(10,989)		-		-		(9,748)		(20,737)

FINANCING ACTIVITIES:
Deferred financing fees		-		-		(29)		-		(29)
Taxes paid on settlement of vested share awards		-		-		(13)		-		(13)
Repayments of term loan facility		-		-		(1,250)		-		(1,250)
Repayments of equipment debt		(214)		-		-		-		(214)
Proceeds from equipment debt		(15,569)		-		15,977		-		408
Net change in accounts with affiliates		-		633		(10,381)		9,748		-
Capital contributions		16,800		-		(16,800)		-		-
Exercise of options and purchases from employee stock plans		-		-		736		-		736
Excess income tax benefit from share-based compensation		-		-		8		-		8
Borrowings under revolving loans		-		-		53,000		-		53,000
Repayments of revolving loans		-		-		(33,000)		-		(33,000)

Net cash flows provided by financing activities		1,017		633		8,248		9,748		19,646

Effect of foreign currency exchange rates on cash and cash equivalents		-		(102)		-		-		(102)

Net increase (decrease) in cash and cash equivalents		(12,456)		686		-		-		(11,770)

Cash and cash equivalents at beginning of period		41,724		663		2		-		42,389

Cash and cash equivalents at end of period	$	29,268	$	1,349	$	2	$	-	$	30,619


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2014
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	$	11,746	$	(2,094)	$	(1,007)	$	-	$	8,645
Net cash flows used in operating activities of discontinued operations		(1,611)		(1,024)		-		-		(2,635)
Cash provided by (used in) operating activities		10,135		(3,118)		(1,007)		-		6,010

INVESTING ACTIVITIES:
Purchases of property and equipment		(21,631)		-		-		-		(21,631)
Proceeds from dispositions of property and equipment		64		-		-		-		64
Proceeds from vendor performance obligations		(3,100)		-		-		-		(3,100)
Net change in accounts with affiliates		(722)		-		-		722		-

Net cash flows used in investing activities of continuing operations		(25,389)		-		-		722		(24,667)
Net cash flows used in investing activities of discontinued operations		(26)		-		-		-		(26)
Cash used in investing activities		(25,415)		-		-		722		(24,693)

FINANCING ACTIVITIES:
Purchase of noncontrolling interest		-		-		(205)		-		(205)
Taxes paid on settlement of vested share awards		-		-		-		-		-
Repayment of equipment debt		-		-		-		-		-
Net change in accounts with affiliates		-		1,864		(1,142)		(722)		-
Exercise of options and purchases from employee stock plans		-		-		415		-		415
Excess income tax benefit from share-based compensation		-		-		4		-		4
Borrowings under revolving loans		-		-		40,000		-		40,000
Repayments of revolving loans		-		-		(38,000)		-		(38,000)

Cash provided by financing activities		-		1,864		1,072		(722)		2,214

Effect of foreign currency exchange rates on cash and cash equivalents		-		(174)		-		-		(174)

Net increase (decrease) in cash and cash equivalents		(15,280)		(1,428)		65		-		(16,643)

Cash and cash equivalents at beginning of period		71,939		3,399		-		-		75,338

Cash and cash equivalents at end of period	$	56,659	$	1,971	$	65	$	-	$	58,695

Basis of presentation (Narrative) (Details)	3 Months Ended
Basis of presentation (Narrative) (Details)	Mar. 31, 2015 segment
Basis of presentation [Line Items]
Number of reportable segments	2
Number of operating Segments	4
Maximum [Member]
Basis of presentation [Line Items]
Average equipment-related costs of total costs of contract revenue	22.00%
Minimum [Member]
Basis of presentation [Line Items]
Average equipment-related costs of total costs of contract revenue	20.00%

Earnings per share (Estimated Useful Lives By Class Of Assets) (Narrative) (Detail) - shares	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings per share [Abstract]
Potentially dilutive stock options and restricted stock units	534	789,000

Earnings per share (Computations For Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Basis of presentation
Loss from continuing operations	$ (8,390)	$ (2,456)
Loss on discontinued operations, net of income taxes, attributable to Great Lakes Dredge & Dock Corporation		(2,739)
Net loss attributable to common stockholders of Great Lakes Dredge & Dock	$ (8,390)	$ (5,195)
Weighted-average common shares outstanding - basic and diluted	60,265	59,708
Weighted-average common shares outstanding - diluted	60,265	59,708
Loss per share from continuing operations - basic	$ (0.14)	$ (0.04)
Loss per share from continuing operations - diluted	$ (0.14)	$ (0.04)

- 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=31042434&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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Accounts Receivable [Line Items]
Retainage	$ 19,445	$ 27,371
Accounts Receivable, Gross	77,366	115,172
Allowance for doubtful accounts	(608)	(578)
Total accounts receivable-net	76,758	114,594
Current portion of accounts receivable-net	75,348	113,188
Long-term accounts receivable and retainage	1,410	1,406
Completed Contracts [Member]
Accounts Receivable [Line Items]
Contracts	12,538	15,342
Contracts In Progress [Member]
Accounts Receivable [Line Items]
Contracts	$ 45,383	$ 72,459

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 88,671	$ 73,491
Costs and earnings in excess of billings for completed contracts	13,331	9,066
Total contract revenues in excess of billings	102,002	82,557
Total billings in excess of contract revenues	(2,617)	(4,639)
Costs And Earnings In Excess Of Billings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings for contracts in progress	496,995	833,368
Amounts billed	(408,324)	(759,877)
Billings In Excess Of Costs And Earnings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billings in excess of costs and earnings, Amounts billed	(310,521)	(181,698)
Billings in excess of costs and earnings, Costs and earnings for contracts in progress	$ 307,904	$ 177,059

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Accrued Expenses [Abstract]
Insurance	$ 17,917	$ 16,778
Accumulated deficit in joint ventures	10,383	10,383
Payroll and employee benefits	6,646	8,808
Income and other taxes	3,543	5,857
Interest	3,069	8,270
Fuel hedge contracts	1,978	3,029
Percentage of completion adjustment	1,096	1,870
Other	13,402	15,046
Total accrued expenses	$ 58,034	$ 70,041

Long-term debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2019	Dec. 31, 2016	Dec. 31, 2015	Feb. 28, 2019	Oct. 04, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 20,000	$ 49,497
Debt Instrument, Basis Spread on Variable Rate	20000.00%
Revolving credit facility, basis spread on variable rate	20000.00%
Letters of credit outstanding	$ 125,461
Letter of credit remaining borrowing capacity	$ 64,539
Principal amount								$ 50,000
Borrowed aggregate principal amount								$ 47,360
Redemption prices				100.00%	101.80%	103.70%
Term loan facility bear interest fixed rate	4.655%
Debt Instrument, Interest Rate, Increase (Decrease)	2.00%
Term Loan number of years	5 years
Net book value of related assets	$ 160,113
Secured promissory note which has an aggregate principal amount		$ 7,544
Secured promissory note accrues interest rate		5.00%
Long-term Debt, Current Maturities	7,818	$ 5,859
Purchases of property and equipment	20,777		$ 21,631
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Debt instrument, face amount							$ 275,000
Stated interest rate							7.375%
Interest Rate, Stated Percentage							7.375%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Net book value of related assets	$ 49,039
Vessels and Ancillary Equipment [Member]
Debt Instrument [Line Items]
Stated interest rate	5.75%
Interest Rate, Stated Percentage	5.75%
Long-term Debt, Current Maturities	$ 2,818
Long-term Debt, Excluding Current Maturities	14,470
Purchases of property and equipment	15,569
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity									$ 210,000
Line of Credit Facility, Amount Outstanding	$ 20,000
Line of credit facility optional increase capacity									15,000
Revolving credit facility, interest rate description	The Credit Agreement is collateralized by a substantial portion of the Company's operating equipment with a net book value at March 31, 2015 of $160,113. Depending on the Company's consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the amended 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.
Multicurrency [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity									50,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity									$ 10,000
GLDD Corporation [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	$ 20,000	41,944
Long-term Debt, Current Maturities	$ 6,953	$ 5,000
Maximum [Member] \| LIBOR Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Revolving credit facility, basis spread on variable rate	2.50%
Maximum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Revolving credit facility, basis spread on variable rate	1.50%
Minimum [Member] \| LIBOR Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Revolving credit facility, basis spread on variable rate	1.50%
Minimum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Revolving credit facility, basis spread on variable rate	0.50%

Fair Value Measurements (Narrative) (Details) $ in Thousands, gal in Millions	3 Months Ended
	Mar. 31, 2015 USD ($) $ / gal gal	Feb. 01, 2019 USD ($)	Dec. 31, 2014 USD ($)	Nov. 30, 2014 USD ($)	Mar. 31, 2011 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Derivative underlying hedge percent	80.00%
Derivative, Nonmonetary Notional Amount, Volume \| gal	6.4
Fair value hedge liabilities	$ 1,978		$ 3,029
Senior Notes	$ 274,887	$ 275,000	$ 274,880
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		7.375%
Senior notes interest rate		7.375%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Fixed price range \| $ / gal	2.92
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Fixed price range \| $ / gal	1.83
Other Financial Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Senior Notes	$ 281,875			$ 275,000	$ 275,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate				7.375%	7.375%
Senior notes interest rate				7.375%	7.375%

Fair Value Measurements (Fair Value Measurements at Reporting Date Using) (Details) - Fuel Hedge Contracts [Member] - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair Value, Net Asset (Liability)	$ 1,978	$ 3,029
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value, Net Asset (Liability)	$ 1,978	$ 3,029

Fair Value Measurements (Accumulated other comprehensive loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivatives, Fair Value [Line Items]
Cumulative translation adjustments-net of tax	$ (808)	$ (189)
Reclassification of derivative losses (gains) to earnings-net of tax		(46)
Change in fair value of derivatives-net of tax		(243)
Net unrealized (gain) loss on derivatives-net of tax (2)		(289)
Net unrealized gain on derivatives-net of tax	(808)	(478)
Costs of contract revenues	163,875	153,475
Income tax provision	(6,037)	(1,453)
Net income (loss)	$ (8,390)	(5,195)
Fuel Hedge Contracts [Member]
Derivatives, Fair Value [Line Items]
Costs of contract revenues		(77)
Income tax provision		(31)
Net income (loss)		$ (46)

Fair Value Measurements (Balance Sheet Location) (Details) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross liability	$ 1,978	$ 3,029

Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units	662
Share-based compensation expense	$ 1,057	$ 996
Employees And Directors [Member]
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

Commitments And Contingencies (Details) - USD ($)		1 Months Ended		3 Months Ended
Commitments And Contingencies (Details) - USD ($)	Jan. 14, 2015	Jan. 31, 2014	May 31, 2013	Mar. 31, 2015
Commitments And Contingencies [Line Items]
Outstanding performance bonds				$ 1,164,253
Revenue value remaining from outstanding performance bonds				493,501,000
Proceeds from Lines of Credit			$ 13,600,000
Proceeds from Legal Settlements	$ 5,309,000
Gain (Loss) Related to Litigation Settlement		$ 10,500,000
Funds remitted		$ 3,100,000
Projects Accounted For Discontinued Operations [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds				49,048,000
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range				$ 10,000,000
Warranty periods				3 years
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range				$ 1,000,000
Warranty periods				1 year

Investment (Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]
Accrued Liabilities Current	$ 58,034	$ 70,041
TerraSea Environmental Solutions [Member]
Schedule of Equity Method Investments [Line Items]
Other current assets	25,005		$ 22,898
Accrued Liabilities Current	$ 10,383	$ 10,383

Business Combinations And Dispositions (Results Of Discontinued Operations) (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 23, 2014	Mar. 31, 2014
Business Dispositions [Abstract]
Revenue		$ 12,124
Loss before income taxes from discontinued operations		(9,620)
Income tax benefit		6,881
Loss from discontinued operations, net of income taxes		$ (2,739)
Proceeds from Divestiture of Businesses	$ 5,309

Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
Segment Information (Narrative) (Details) $ in Thousands	Mar. 31, 2015 USD ($) segment	Mar. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Contract revenues	$ 174,557	$ 174,382
Number of reportable segments \| segment	2
Dredging [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 154,128	161,960
Number of reportable segments \| segment	2
Demolition [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 21,552	12,730
Foreign [Member]
Segment Reporting Information [Line Items]
Contract revenues	41,699	16,470
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ (1,123)	$ (308)

Segment Information (Segment Reporting By Segment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($) segment	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Contract revenues	$ 174,557	$ 174,382
Operating income (loss)	(7,258)	2,885
Depreciation and amortization	13,153	10,885
Total assets	889,349		$ 893,234
Property and equipment - net	418,839		399,445
Investment in joint ventures	$ 7,726		7,889
Number of Reportable Segments \| segment	2
GLDD Corporation [Member]
Segment Reporting Information [Line Items]
Total assets	$ 724,947		$ 694,611
Dredging [Member]
Segment Reporting Information [Line Items]
Contract revenues	154,128	161,960
Operating income (loss)	$ 7,874	7,429
Number of Reportable Segments \| segment	2
Demolition [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 21,552	12,730
Operating income (loss)	$ (15,132)	$ (4,544)

Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Feb. 01, 2019	Dec. 31, 2014
Subsidiary Guarantors [Abstract]
Senior Notes	$ 274,887	$ 275,000	$ 274,880
Senior notes interest rate		7.375%
Owned Domestic Subsidiaries Percent	100.00%

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Feb. 01, 2019	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents		$ 30,619	$ 42,389	$ 58,695	$ 75,338
Accounts receivable-net		75,348	113,188
Contract revenues in excess of billings		102,002	82,557
Inventories		32,870	34,735
Prepaid expenses and other current assets		79,643	69,375
Total current assets		320,482	342,244
PROPERTY AND EQUIPMENT-Net		418,839	399,445
GOODWILL AND OTHER INTANGIBLE ASSETS-Net		93,522	95,289
INVENTORIES-Noncurrent		36,555	36,262
INVESTMENTS IN JOINT VENTURES		7,726	7,889
OTHER		12,225	12,105
TOTAL		889,349	893,234
LIABILITIES AND EQUITY
Accounts payable		102,361	119,971
Accrued expenses		58,034	70,041
Billings in excess of contract revenues		2,617	4,639
Current portion of long term debt		7,818	5,859
Total current liabilities		170,830	200,510
7 3/8% SENIOR NOTES	$ 275,000	274,887	274,880
REVOLVING CREDIT FACILITY		20,000	49,497
NOTES PAYABLE		62,393	49,497
DEFERRED INCOME TAXES		92,137	92,007
OTHER		20,549	20,377
Total liabilities		640,796	637,271
EQUITY:
TOTAL EQUITY		248,553	255,963	237,700	242,101
TOTAL		889,349	893,234
Subsidiary Guarantors [Member]
ASSETS
Cash and cash equivalents		29,268	41,724	56,659	71,939
Accounts receivable-net		77,237	115,739
Receivables from affiliates			152,822
Contract revenues in excess of billings		99,307	78,631
Inventories		32,870	34,735
Prepaid expenses and other current assets		57,921	54,327
Total current assets		296,603	477,978
PROPERTY AND EQUIPMENT-Net		418,819	399,421
GOODWILL AND OTHER INTANGIBLE ASSETS-Net		93,522	95,289
INVENTORIES-Noncurrent		36,555	36,262
INVESTMENTS IN JOINT VENTURES		7,726	7,889
RECEIVABLES FROM AFFILIATES		24,037
INVESTMENTS IN SUBSIDIARIES		3,725	3,757
OTHER		7,603	7,135
TOTAL		888,590	1,027,731
LIABILITIES AND EQUITY
Accounts payable		103,231	121,282
Payables to affiliates		84,193	196,829
Due from Affiliate, Current			152,822
Accrued expenses		54,528	60,415
Billings in excess of contract revenues		2,394	4,639
Current portion of long term debt		865	859
Total current liabilities		161,018	384,024
REVOLVING CREDIT FACILITY			7,553
NOTES PAYABLE		7,653
DEFERRED INCOME TAXES		(369)	172
OTHER		20,110	19,939
Total liabilities		272,605	411,688
EQUITY:
TOTAL EQUITY		615,985	616,043
TOTAL		888,590	1,027,731
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents		1,349	663	1,971	$ 3,399
Accounts receivable-net		258	355
Receivables from affiliates			3,673
Contract revenues in excess of billings		3,131	4,236
Prepaid expenses and other current assets		396	431
Total current assets		5,134	9,358
PROPERTY AND EQUIPMENT-Net		20	24
RECEIVABLES FROM AFFILIATES		3,671
OTHER		3	3
TOTAL		8,828	9,385
LIABILITIES AND EQUITY
Accounts payable		1,566	1,389
Payables to affiliates		728	403
Due from Affiliate, Current			3,673
Accrued expenses		202	659
Billings in excess of contract revenues		223
Total current liabilities		1,991	2,451
Total liabilities		2,719	2,451
EQUITY:
TOTAL EQUITY		6,109	6,934
TOTAL		8,828	9,385
GLDD Corporation [Member]
ASSETS
Cash and cash equivalents		2	2	$ 65
Receivables from affiliates			55,805
Prepaid expenses and other current assets		21,326	14,617
Total current assets		21,328	70,424
RECEIVABLES FROM AFFILIATES		80,631
INVESTMENTS IN SUBSIDIARIES		618,369	619,220
OTHER		4,619	4,967
TOTAL		724,947	694,611
LIABILITIES AND EQUITY
Accounts payable		147	516
Payables to affiliates		23,418	15,068
Due from Affiliate, Current			55,805
Accrued expenses		3,304	8,967
Current portion of long term debt		6,953	5,000
Total current liabilities		10,404	29,551
7 3/8% SENIOR NOTES		274,887	274,880
REVOLVING CREDIT FACILITY		20,000	41,944
NOTES PAYABLE		54,740
DEFERRED INCOME TAXES		92,506	91,835
OTHER		439	438
Total liabilities		476,394	438,648
EQUITY:
TOTAL EQUITY		248,553	255,963
TOTAL		724,947	694,611
Eliminations [Member]
ASSETS
Accounts receivable-net		(2,147)	(2,906)
Receivables from affiliates			(212,300)
Contract revenues in excess of billings		(436)	(310)
Total current assets		(2,583)	(215,516)
RECEIVABLES FROM AFFILIATES		(108,339)
INVESTMENTS IN SUBSIDIARIES		(622,094)	(622,977)
TOTAL		(733,016)	(838,493)
LIABILITIES AND EQUITY
Accounts payable		(2,583)	(3,216)
Payables to affiliates		(108,339)	(212,300)
Due from Affiliate, Current			(212,300)
Total current liabilities		(2,583)	(215,516)
Total liabilities		(110,922)	(215,516)
EQUITY:
TOTAL EQUITY		(622,094)	(622,977)
TOTAL		$ (733,016)	$ (838,493)

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 174,557	$ 174,382
Costs of contract revenues	(163,875)	(153,475)
Gross profit	10,682	20,907
General and administrative expenses	17,948	17,870
Loss on sale of assets-net	(8)	152
Operating income (loss)	(7,258)	2,885
Interest expense-net	(5,630)	(5,016)
Equity in loss of joint ventures	(1,098)	(1,843)
Other income (expense)	(441)	65
Income (loss) from continuing operations before income taxes	(14,427)
Loss from continuing operations before income taxes	(14,427)	(3,909)
Income tax (provision) benefit	6,037	1,453
Loss from continuing operations	(8,390)	(2,456)
Loss from discontinued operations, net of income taxes		(2,739)
Net loss	(8,390)	(5,195)
Net loss attributable to common stockholders of Great Lakes Dredge & Dock Corporation	(8,390)	(5,195)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(9,198)	(5,673)
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	172,354	173,322
Costs of contract revenues	(161,204)	(150,737)
Gross profit	11,150	22,585
General and administrative expenses	17,948	17,870
Loss on sale of assets-net	(8)	152
Operating income (loss)	(6,790)	4,563
Interest expense-net	(299)	69
Equity in earnings (loss) of subsidiaries	4	(1,143)
Equity in loss of joint ventures	(1,098)	(1,843)
Other income (expense)	(434)	58
Income (loss) from continuing operations before income taxes	(8,617)
Loss from continuing operations before income taxes		1,704
Income tax (provision) benefit		480
Loss from continuing operations	(8,617)	2,184
Loss from discontinued operations, net of income taxes		(2,868)
Net loss attributable to common stockholders of Great Lakes Dredge & Dock Corporation		(684)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(8,617)	(973)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	3,192	6,029
Costs of contract revenues	(3,660)	(7,707)
Gross profit	(468)	(1,678)
Operating income (loss)	(468)	(1,678)
Interest expense-net		(129)
Other income (expense)	(7)	7
Income (loss) from continuing operations before income taxes	(475)
Loss from continuing operations before income taxes		(1,800)
Income tax (provision) benefit	(81)
Loss from continuing operations	(556)	(1,800)
Loss from discontinued operations, net of income taxes		(1,024)
Net loss attributable to common stockholders of Great Lakes Dredge & Dock Corporation		(2,824)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(1,364)	(3,013)
GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Interest expense-net	(5,331)	(4,956)
Equity in earnings (loss) of subsidiaries	(9,177)	3,505
Income (loss) from continuing operations before income taxes	(14,508)
Loss from continuing operations before income taxes		(1,451)
Income tax (provision) benefit	6,118	973
Loss from continuing operations	(8,390)	(478)
Loss from discontinued operations, net of income taxes		(4,717)
Net loss attributable to common stockholders of Great Lakes Dredge & Dock Corporation		(5,195)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(9,198)	(5,673)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(989)	(4,969)
Costs of contract revenues	989	4,969
Equity in earnings (loss) of subsidiaries	9,173	(2,362)
Income (loss) from continuing operations before income taxes	9,173
Loss from continuing operations before income taxes		(2,362)
Loss from continuing operations	9,173	(2,362)
Loss from discontinued operations, net of income taxes		5,870
Net loss attributable to common stockholders of Great Lakes Dredge & Dock Corporation		3,508
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$ 9,981	$ 3,986

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	$ (10,577)	$ 8,645
Net cash flows used in operating activities of discontinued operations		(2,635)
Cash provided by (used in) operating activities	(10,577)	6,010
INVESTING ACTIVITIES:
Purchases of property and equipment	(20,777)	(21,631)
Proceeds from dispositions of property and equipment	40	64
Payments on vendor performance obligations		(3,100)
Net cash flows used in investing activities of continuing operations	(20,737)	(24,667)
Net cash flows used in investing activities of discontinued operations		(26)
Cash used in investing activities	(20,737)	(24,693)
FINANCING ACTIVITIES:
Deferred financing fees	(29)
Taxes paid on settlement of vested share awards	(13)
Repayment of long term note payable	(1,250)
Repayments of equipment debt	(214)
Proceeds from equipment debt	408
Purchase of noncontrolling interest		205
Exercise of options and purchases from employee stock plans	736	415
Excess income tax benefit from share-based compensation	8	4
Borrowings under revolving loans	53,000	40,000
Repayments of revolving loans	(33,000)	(38,000)
Net cash flows provided by (used in) financing activities of continuing operations	19,646
Net cash provided by financing activities	19,646	2,214
Effect of foreign currency exchange rates on cash and cash equivalents	(102)	(174)
Net decrease in cash and cash equivalents	(11,770)	(16,643)
Cash and cash equivalents at beginning of period	42,389	75,338
Cash and cash equivalents at end of period	30,619	58,695
Subsidiary Guarantors [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	(2,484)	11,746
Net cash flows used in operating activities of discontinued operations		(1,611)
Cash provided by (used in) operating activities		10,135
INVESTING ACTIVITIES:
Purchases of property and equipment	(20,777)	(21,631)
Proceeds from dispositions of property and equipment	40	64
Payments on vendor performance obligations		(3,100)
Net change in accounts with affiliates	9,748	(722)
Net cash flows used in investing activities of continuing operations	(10,989)	(25,389)
Net cash flows used in investing activities of discontinued operations		(26)
Cash used in investing activities		(25,415)
FINANCING ACTIVITIES:
Repayments of equipment debt	(214)
Proceeds from equipment debt	(15,569)
Capital contributions	16,800
Net cash flows provided by (used in) financing activities of continuing operations	1,017
Net decrease in cash and cash equivalents	(12,456)	(15,280)
Cash and cash equivalents at beginning of period	41,724	71,939
Cash and cash equivalents at end of period	29,268	56,659
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	155	(2,094)
Net cash flows used in operating activities of discontinued operations		(1,024)
Cash provided by (used in) operating activities		(3,118)
FINANCING ACTIVITIES:
Net change in accounts with affiliates, in finance activities	633	1,864
Net cash flows provided by (used in) financing activities of continuing operations	633
Net cash provided by financing activities		1,864
Effect of foreign currency exchange rates on cash and cash equivalents	(102)	(174)
Net decrease in cash and cash equivalents	686	(1,428)
Cash and cash equivalents at beginning of period	663	3,399
Cash and cash equivalents at end of period	1,349	1,971
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	(8,248)	(1,007)
Cash provided by (used in) operating activities		(1,007)
FINANCING ACTIVITIES:
Deferred financing fees	(29)
Taxes paid on settlement of vested share awards	(13)
Repayment of long term note payable	(1,250)
Proceeds from equipment debt	15,977
Purchase of noncontrolling interest		205
Exercise of options and purchases from employee stock plans	736	415
Excess income tax benefit from share-based compensation	8	4
Net change in accounts with affiliates, in finance activities	(10,381)	(1,142)
Borrowings under revolving loans	53,000	40,000
Repayments of revolving loans	(33,000)	(38,000)
Capital contributions	(16,800)
Net cash flows provided by (used in) financing activities of continuing operations	8,248
Net cash provided by financing activities		1,072
Net decrease in cash and cash equivalents		65
Cash and cash equivalents at beginning of period	2
Cash and cash equivalents at end of period	2	65
Eliminations [Member]
INVESTING ACTIVITIES:
Net change in accounts with affiliates	(9,748)	722
Net cash flows used in investing activities of continuing operations	(9,748)	722
Cash used in investing activities		722
FINANCING ACTIVITIES:
Net change in accounts with affiliates, in finance activities	9,748	(722)
Net cash flows provided by (used in) financing activities of continuing operations	$ 9,748
Net cash provided by financing activities		$ (722)