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Document And Entity Information - shares	9 Months Ended
Document And Entity Information - shares	Sep. 30, 2015	Oct. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
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		60,446,628

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 9,421	$ 42,389
Accounts receivable—net	143,884	113,188
Contract revenues in excess of billings	66,759	82,557
Inventories	37,250	34,735
Prepaid expenses and other current assets	76,871	69,375
Total current assets	334,185	342,244
PROPERTY AND EQUIPMENT—Net	423,157	399,445
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	86,900	95,289
INVENTORIES—Noncurrent	37,508	36,262
INVESTMENTS IN JOINT VENTURES	12,319	7,889
OTHER	11,902	12,105
TOTAL	905,971	893,234
CURRENT LIABILITIES:
Accounts payable	109,961	119,971
Accrued expenses	63,978	70,041
Billings in excess of contract revenues	6,451	4,639
Current portion of long term debt	8,369	5,859
Total current liabilities	188,759	200,510
7 3/8% SENIOR NOTES	274,902	274,880
REVOLVING CREDIT FACILITY	28,000
NOTES PAYABLE	52,108	49,497
DEFERRED INCOME TAXES	89,255	92,007
OTHER	20,864	20,377
Total liabilities	653,888	637,271
COMMITMENTS AND CONTINGENCIES (Note 9)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 60,447 and 60,170 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively.	6	6
Treasury stock, at cost	(1,107)
Additional paid-in capital	282,141	278,166
Accumulated deficit	(26,829)	(21,475)
Accumulated other comprehensive loss	(2,128)	(734)
Total equity	252,083	255,963
TOTAL	$ 905,971	$ 893,234

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	60,447,000	60,170,000
Common stock, shares outstanding	60,447,000	60,170,000

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Contract revenues	$ 202,198	$ 634,236	$ 561,289
Costs of contract revenues	177,739	567,182	489,720
Gross profit	24,459	67,054	71,569
General and administrative expenses	16,062	48,768	49,850
Impairment of goodwill		2,750
(Gain) loss on sale of assets—net	390	(887)	558
Operating income	8,007	16,423	21,161
Interest expense—net	(4,702)	(18,490)	(14,730)
Equity in loss of joint ventures	(5,785)	(5,765)	(9,063)
Gain on bargain purchase acquisition			2,197
Other income (expense)	384	(353)	410
Income (loss) from continuing operations before income taxes	(2,096)	(8,185)	(25)
Income tax (provision) benefit	1,069	2,831	425
Income (loss) from continuing operations	(1,027)	(5,354)	400
Loss from discontinued operations, net of income taxes	(1,059)		(9,118)
Net income (loss)	$ (2,086)	$ (5,354)	$ (8,718)
Basic earnings (loss) per share attributable to continuing operations	$ (0.01)	$ (0.09)	$ 0.01
Basic loss per share attributable to discontinued operations, net of tax	(0.02)		(0.15)
Basic loss per share	$ (0.03)	$ (0.09)	$ (0.14)
Basic weighted average shares	60,040	60,411	59,870
Diluted earnings (loss) per share attributable to continuing operations	$ (0.01)	$ (0.09)	$ 0.01
Diluted loss per share attributable to discontinued operations, net of tax	(0.02)		(0.15)
Diluted loss per share	$ (0.03)	$ (0.09)	$ (0.14)
Diluted weighted average shares	60,040	60,411	60,491

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

3 Months Ended

9 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2015

Sep. 30, 2014

Statement Of Income And Comprehensive Income [Abstract]

Net income (loss)

$ 312

$ (2,086)

$ (5,354)

$ (8,718)

Currency translation adjustment—net of tax

^[1]

(639)

(416)

(1,394)

(389)

Net unrealized gain on derivatives—net of tax

^[2]

(169)

(199)

Other comprehensive loss—net of tax

(639)

(585)

(1,394)

(588)

Comprehensive loss

$ (327)

$ (2,671)

$ (6,748)

$ (9,306)

[1]	Net of income tax benefit of $422 and $276 for the three months ended September 30, 2015 and 2014, respectively and $922 and $259 for nine months ended September 30, 2015 and 2014, respectively.
[2]	Net of income tax expense of $111 and $132 for the three and nine months ended September 30, 2014, respectively.

- Definition

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

+ References + Details

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ 422	$ 276	$ 922	$ 259
Net unrealized (gain) loss on derivatives-net of tax		$ 111		$ 132

Condensed Consolidated Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]
BALANCE - value at Dec. 31, 2013	$ 242,101	$ 6		$ 275,183	$ (31,770)	$ (473)	$ (845)
BALANCE - shares at Dec. 31, 2013		59,670
Share-based compensation, Value	1,816			1,816
Share-based compensation, Shares		94
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(501)			(501)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		107
Exercise of options and purchases from employee stock plans, Value	1,542			1,542
Exercise of options and purchases from employee stock plans, Shares		265
Excess income tax benefit from share-based compensation	45			45
Distributions paid to noncontrolling interests	(143)			(988)			$ 845
Net income (loss)	(8,718)				(8,718)
Total other comprehensive income (loss)	(588)					(588)
BALANCE - value at Sep. 30, 2014	235,554	$ 6		277,097	(40,488)	(1,061)
BALANCE - shares at Sep. 30, 2014		60,136
BALANCE - value at Dec. 31, 2014	255,963	$ 6		278,166	(21,475)	(734)
BALANCE - shares at Dec. 31, 2014		60,170
Share-based compensation, Value	2,897			2,897
Share-based compensation, Shares		124
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(265)			(265)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		98
Exercise of options and purchases from employee stock plans, Value	1,356			1,356
Exercise of options and purchases from employee stock plans, Shares		268
Excess income tax benefit from share-based compensation	(13)			(13)
Purchase of treasury stock, value	(1,107)		$ (1,107)
Purchase of treasury stock, shares		(213)
Net income (loss)	(5,354)				(5,354)
Total other comprehensive income (loss)	(1,394)					(1,394)
BALANCE - value at Sep. 30, 2015	$ 252,083	$ 6	$ (1,107)	$ 282,141	$ (26,829)	$ (2,128)
BALANCE - shares at Sep. 30, 2015		60,447

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES:
Net income (loss)	$ (5,354)	$ (8,718)
Loss from discontinued operations, net of income taxes		(9,118)
Income (loss) from continuing operations	(5,354)	400
Adjustments to reconcile net income (loss) to net cash flows used in operating activities:
Depreciation and amortization	47,747	32,744
Equity in loss of joint ventures	(3,402)	9,063
Cash distributions from joint ventures	2,500
Deferred income taxes	(3,031)	(11,034)
(Gain) loss on sale of assets	(887)	558
Impairment of goodwill	2,750
Gain on bargain purchase acquisition		(2,197)
Gain on adjustment of contingent consideration	(8,444)
Amortization of deferred financing fees	2,126	1,036
Unrealized net gain from mark-to-market valuations of derivatives	(1,479)	1,051
Unrealized foreign currency gain	(1,076)	(561)
Share-based compensation expense	2,897	1,816
Excess income tax benefit from share-based compensation	13	(45)
Changes in assets and liabilities:
Accounts receivable	(31,819)	(3,791)
Contract revenues in excess of billings	14,328	(18,292)
Inventories	(3,761)	504
Prepaid expenses and other current assets	(6,727)	(2,743)
Accounts payable and accrued expenses	(9,896)	10,927
Billings in excess of contract revenues	1,657	(1,776)
Other noncurrent assets and liabilities	(2,039)	(2,369)
Net cash flows provided by (used in) operating activities of continuing operations	(3,897)	15,291
Net cash flows used in operating activities of discontinued operations		(5,024)
Cash provided by (used in) operating activities	(3,897)	10,267
INVESTING ACTIVITIES:
Purchases of property and equipment	(53,394)	(66,433)
Proceeds from dispositions of property and equipment	1,167	1,614
Payments on vendor performance obligations (Note 9)		(3,100)
Payments for acquisitions of businesses		(2,048)
Net cash flows used in investing activities of continuing operations	(52,227)	(69,967)
Net cash flows provided by investing activities of discontinued operations		5,275
Cash used in investing activities	(52,227)	(64,692)
FINANCING ACTIVITIES:
Deferred financing fees	(29)	(845)
Repayments of long term note payable	(488)
Taxes paid on settlement of vested share awards	(265)	(501)
Repayments of term loan facility	(3,750)
Repayments of equipment debt	(853)	(121)
Proceeds from equipment debt	410
Purchase of noncontrolling interest		(205)
Exercise of options and purchases from employee stock plans	1,356	1,542
Excess income tax benefit from share-based compensation	(13)	45
Treasury stock	(1,107)
Borrowings under revolving loans	146,000	105,000
Repayments of revolving loans	(118,000)	(105,000)
Net cash provided by (used in) financing activities	23,261	(85)
Effect of foreign currency exchange rates on cash and cash equivalents	(105)	260
Net decrease in cash and cash equivalents	(32,968)	(54,250)
Cash and cash equivalents at beginning of period	42,389	75,338
Cash and cash equivalents at end of period	9,421	21,088
Supplemental Cash Flow Information
Cash paid for interest	23,645	18,936
Cash paid (refunded) for income taxes	987	(9,364)
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	4,981	18,401
Property and equipment purchased on capital leases and equipment notes	2,190	1,616
Purchase of noncontrolling interest		$ 988
Property and equipment purchased on notes payable	$ 15,569

Basis of presentation

9 Months Ended

Sep. 30, 2015

Organization Consolidation And Presentation Of Financial Statements [Abstract]

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 September 30, 2015, and its results of operations for the three and nine months ended September 30, 2015 and 2014 and cash flows for the nine months ended September 30, 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 three operating segments that, through aggregation, comprise two reportable segments: dredging and environmental & remediation. Three 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 three reporting units. Due to a decline in the overall financial performance and declining cash flows in the Terra Contracting Services, LLC (“Terra”) reporting unit, the Company concluded there was a triggering event that required an interim impairment test for the reporting unit in the second quarter of 2015 and recorded a goodwill impairment charge of $2,750 during the quarter ended June 30, 2015. This impairment of goodwill is discussed in Note 6. The Company performed its most recent annual test of impairment as of July 1, 2015 for the remaining goodwill with no indication of impairment as of the test date. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2016.

In connection with the acquisition of Magnus Pacific (“Magnus”) in the fourth quarter of 2014, the Company issued a secured promissory note to the former owners of Magnus which has terms that could reduce the amount owed based on minimum EBITDA expectations. The Company remeasures the fair value of the promissory note at each reporting period based on projections of the earnings target for the business. Based on the Company’s projections at June 30, 2015, Magnus is not expected to reach the minimum EBITDA threshold for 2015 designated in the secured promissory note; therefore, during the second quarter of 2015, the Company reduced the remaining fair value by $7,013 to zero and the corresponding change is reflected in general and administrative expenses.

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 April 2015, the Financial Accounting Standards Board issued Accounting Standard Update No. 2015-03 (“ASU 2015-03”), Interest - Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. This update is effective for fiscal years beginning after December 15, 2015, and is required to be applied retrospectively. The Company does not expect a material impact to our consolidated financial statements as a result of such requirement.

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 has been deferred to be effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period, which will be our first quarter of fiscal 2018. Early adoption is permitted in fiscal 2017. We are currently evaluating the impact of ASU 2014-09 on our consolidated financial statements.

Earnings per share

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Earnings Per Share

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 nine months ended September 30, 2015, the dilutive effect of 462 thousand stock options and restricted stock units were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during this period. For the three months ended September 30, 2014, the dilutive effect of 521 thousand stock options and restricted stock units were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during this period. For the three months ended September 30, 2015, 1,170 thousand stock options or restricted stock units were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method. For the nine months ended September 30, 2014, 500 thousand stock options or restricted stock units were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method. The computations for basic and diluted earnings (loss) per share from continuing operations are as follows:

	Three Months Ended					Nine Months Ended
(shares in thousands)	September 30,					September 30,
	2015		2014			2015			2014
Income (loss) from continuing operations	$	312	$	(1,027	)	$	(5,354	)	$	400
Loss on discontinued operations, net of income taxes		—		(1,059	)		—			(9,118	)
Net income (loss)		312		(2,086	)		(5,354	)		(8,718	)

Weighted-average common shares outstanding — basic		60,496		60,040			60,411			59,870
Effect of stock options and restricted stock units		345		—			—			621

Weighted-average common shares outstanding — diluted		60,841		60,040			60,411			60,491

Earnings (loss) per share from continuing operations — basic	$	—	$	(0.01	)	$	(0.09	)	$	0.01
Earnings (loss) per share from continuing operations — diluted	$	—	$	(0.01	)	$	(0.09	)	$	0.01

Accounts Receivable And Contracts In Progress

9 Months Ended

Sep. 30, 2015

Receivables [Abstract]

Accounts Receivables And Contracts In Progress

Accounts receivable and contracts in progress

Accounts receivable at September 30, 2015 and December 31, 2014 are as follows:

	September 30,			December 31,
	2015			2014
Completed contracts	$	26,672		$	15,342
Contracts in progress		92,298			72,459
Retainage		27,445			27,371
		146,415			115,172
Allowance for doubtful accounts		(678	)		(578	)

Total accounts receivable—net	$	145,737		$	114,594

Current portion of accounts receivable—net	$	143,884		$	113,188
Long-term accounts receivable and retainage		1,853			1,406
Total accounts receivable—net	$	145,737		$	114,594

The components of contracts in progress at September 30, 2015 and December 31, 2014 are as follows:

	September 30,			December 31,
	2015			2014
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	626,318		$	833,368
Amounts billed		(572,687	)		(759,877	)
Costs and earnings in excess of billings for contracts in progress		53,631			73,491

Costs and earnings in excess of billings for completed contracts		13,128			9,066

Total contract revenues in excess of billings	$	66,759		$	82,557

Billings in excess of costs and earnings:
Amounts billed	$	(90,640	)	$	(181,698	)
Costs and earnings for contracts in progress		84,189			177,059

Total billings in excess of contract revenues	$	(6,451	)	$	(4,639	)

Accrued Expenses

9 Months Ended

Sep. 30, 2015

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses

Accrued expenses at September 30, 2015 and December 31, 2014 are as follows:

	September 30,		December 31,
	2015		2014

Insurance	$	17,408	$	16,778
Accumulated deficit in joint ventures		13,919		10,383
Payroll and employee benefits		10,246		8,808
Income and other taxes		4,252		5,857
Interest		3,984		8,270
Percentage of completion adjustment		2,829		1,870
Fuel hedge contracts		1,550		3,029
Other		9,790		15,046
Total accrued expenses	$	63,978	$	70,041

Long-term Debt

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt

Credit Agreement

On June 4, 2012, the Company entered into a senior revolving credit agreement (as subsequently amended, 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 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 feature 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 September 30, 2015 of $151,593.

Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the 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 Agreement 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 September 30, 2015, the Company had $28,000 of borrowings on the revolver and $81,323 of letters of credit outstanding, resulting in $100,677 of availability under the Credit Agreement. At September 30, 2015, the Company was in compliance with its various financial covenants under the Credit Agreement.

Term loan facility

On November 4, 2014, the Company entered into a 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. The Company has 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 “ATB”).

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, which commenced 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 September 30, 2015 of $49,838.

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

The Company enters into note arrangements to finance certain vessels and ancillary equipment. During the first quarter of 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 $3,239. The long term portion is $14,361 and is included in notes payable.

Impairment of Goodwill

9 Months Ended

Sep. 30, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Impairment Of Goodwill

Impairment of goodwill

The Company’s annual goodwill impairment test is conducted in the third quarter of each year and interim evaluations are performed when the Company determines that a triggering event has occurred that would more likely than not reduce the fair value of goodwill below its carrying value. Due to a decline in the overall financial performance and declining cash flows in the Terra reporting unit, the Company concluded there was a triggering event that required an interim impairment test for the reporting unit in the second quarter of 2015.

The Company performed step one of the goodwill impairment test as of June 30, 2015, which compared the fair value of the Terra reporting unit against its carrying amount, including goodwill. In deriving the fair value of the Terra reporting unit, the Company used both a market-based approach and an income-based approach. Under the income approach, the fair value of the reporting unit is based on the present value of estimated future cash flows. Under the market approach, the Company uses the guideline public company method by applying estimated market-based enterprise value multiples to the reporting unit’s estimated revenue and Adjusted EBITDA from continuing operations. Based on the first step analysis, management concluded that the fair value of the Terra reporting unit was less than its carrying value; therefore, the Company performed step two of the goodwill impairment analysis.

Step two of the goodwill impairment analysis measures the impairment charge by allocating the reporting unit’s fair value to all of the assets and liabilities of the reporting unit in a hypothetical analysis that calculates implied fair value of goodwill in the same manner as if the reporting unit was being acquired in a business combination. Any excess of the carrying value of the reporting unit’s goodwill over the implied fair value of the reporting unit’s goodwill is recorded as a loss on impairment of goodwill.

Management determined that the Terra reporting unit’s implied fair value of goodwill was below the carrying value as of June 30, 2015. As a result, the Company recorded an impairment charge of $2,750 in the second quarter of 2015.

The Company performed its annual goodwill impairment test for the remaining reporting units in the third quarter and no additional impairment was recorded for the nine months ended September 30, 2015.

The change in the carrying value of goodwill for the period ended September 30, 2015 is as follows:

	Dredging Segment		Environmental & Remediation Segment			Total
Balance — December 31, 2014	$	76,576	$	9,750		$	86,326

Impairment of goodwill		—		(2,750	)		(2,750	)

BALANCE—September 30, 2015	$	76,576	$	7,000		$	83,576

Fair Value Measurements

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

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:

			Fair Value Measurements at Reporting Date Using
Description	At September 30, 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	$	1,550	$	—	$	1,550	$	—

			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 September 30, 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 September 30, 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 August 2016. As of September 30, 2015, there were 8.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through August 2016. Under these swap agreements, the Company will pay fixed prices ranging from $1.67 to $2.11 per gallon.

At September 30, 2015 and December 31, 2014, the fair value liability of the fuel hedge contracts was estimated to be $1,550 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 September 30, 2015 and December 31, 2014 is as follows:

		Fair Value at
		September 30,		December 31,
	Balance Sheet Location	2015		2014
Liability derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	1,550	$	3,029

Assets and liabilities measured at fair value on a nonrecurring basis

All other nonfinancial assets and liabilities measured at fair value in the financial statements on a nonrecurring basis are subject to fair value measurements and disclosures. Nonfinancial assets and liabilities included in our condensed consolidated balance sheets and measured on a nonrecurring basis consist of goodwill and long-lived assets, including other acquired intangibles. Goodwill and long-lived assets are measured at fair value to test for and measure impairment, if any, at least annually for goodwill or when necessary for both goodwill and long-lived assets.

The Company estimated the fair value of our Terra reporting unit for our goodwill impairment test by using both a market-based approach and an income-based approach. The income approach is dependent on a number of factors, including estimates of future market growth trends, forecasted revenues and expenses based upon historical operating data, appropriate discount rates and other variables. The market approach measures the value of a reporting unit through comparison to comparable companies. Under the market approach, the Company uses the guideline public company method by applying estimated market-based enterprise value multiples to the reporting unit’s estimated revenue and Adjusted EBITDA from continuing operations. The Company analyzed companies that performed similar services or are considered peers.

An impairment of goodwill was recorded in the amount of $2,750 in the second quarter of 2015. The fair value of goodwill was determined using quantitative models that contained significant unobservable inputs. See Note 6.

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2015
Goodwill
Balance at January 1,	$	86,326
Impairment of goodwill		(2,750	)
Balance at September 30,	$	83,576

Accumulated other comprehensive loss

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

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
Cumulative translation adjustments—net of tax	$	(639	)	$	(416	)	$	(1,394	)	$	(389	)
Derivatives:
Reclassification of derivative gains to earnings—net of tax		—			(306	)		—			(332	)
Change in fair value of derivatives—net of tax		—			136			—			132
Net unrealized gain on derivatives—net of tax		—			(169	)		—			(199	)
Total other comprehensive loss	$	(639	)	$	(585	)	$	(1,394	)	$	(588	)

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

		Three Months Ended			Nine Months Ended
		September 30,			September 30,
	Statement of Operations Location	2014			2014
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	(241	)	$	(286	)
	Income tax benefit		65			46
		$	(306	)	$	(332	)

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 September 30, 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 $275,688 at September 30, 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

9 Months Ended

Sep. 30, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-based Compensation

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 698 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 $839 and $828 for the three months ended September 30, 2015 and 2014, respectively and $2,897 and $1,816 for the nine months ended September 30, 2015 and 2014, respectively.

Commitments And Contingencies

9 Months Ended

Sep. 30, 2015

Commitments And Contingencies Disclosure [Abstract]

Commitments And Contingencies

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. In April 2015, we entered into additional bonding agreements with ACE Holdings, Inc., Argonaut Insurance Company, Berkley Insurance Company, and Liberty Mutual Insurance Company (collectively, the “Additional Sureties”). The bonding agreements with the Additional Sureties contain similar terms and conditions as the Zurich bonding agreement. 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 September 30, 2015, the Company had outstanding performance bonds totaling approximately $1,066,169, of which $45,582 relates to projects accounted for in discontinued operations. The revenue value remaining in backlog related to the projects of continuing operations totaled approximately $455,712.

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 the results of operations, cash flows or financial condition of the Company.

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 agreed to a settlement, which was paid by insurance. The court preliminarily approved the settlement on June 12, 2015, and granted final approval on September 17, 2015. The securities litigation is now concluded.

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 agreed to a settlement, which was paid by insurance. The DuPage County Circuit Court preliminarily approved the settlement of the Hammoud/St. Lucie action on May 13, 2015, and granted final approval on August 7, 2015. The Griffin action was dismissed with prejudice on August 20, 2015. The derivative litigation is now concluded.

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

9 Months Ended

Sep. 30, 2015

Equity Method Investments And Joint Ventures [Abstract]

Investments

10.

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 September 30, 2015 and December 31, 2014, the Company had net advances to TerraSea of $28,974 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 $13,919 and $10,383 at September 30, 2015 and December 31, 2014, respectively, 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. The joint venture partner has notified the Company that it disagrees with the amount of net advances to TerraSea. The Company believes that its joint venture partner remains obligated for its share of net advances, and any future advances necessary to complete TerraSea’s remaining project. During July 2015, the Company proposed taking a larger percent of the loss on a TerraSea project. Based on this proposal, the Company accrued $1,506 at June 30, 2015 representing the estimated share of additional losses to be assumed. To the extent that net 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

9 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

Business Dispositions

11.

Business dispositions

On April 23, 2014, the Company entered into an agreement and completed the sale of NASDI and Yankee, 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 9). 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			Nine Months Ended
	September 30,			September 30,
	2014			2014

Revenue	$	—		$	14,439

Loss before income taxes from discontinued operations	$	(1,053	)	$	(18,393	)
Income tax (provision) benefit		(6	)		9,275
Loss from discontinued operations, net of income taxes	$	(1,059	)	$	(9,118	)

Segment Information

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Segment Information

12.

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						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
Dredging
Contract revenues	$	162,526		$	167,079		$	506,700		$	486,153
Operating income		19,598			5,733			45,587			24,157

Environmental & remediation
Contract revenues	$	60,451		$	37,182		$	131,929		$	79,224
Operating income (loss)		(9,906	)		2,274			(29,164	)		(2,996	)

Intersegment revenues	$	(2,175	)	$	(2,063	)		(4,393	)		(4,088	)
Total
Contract revenues	$	220,802		$	202,198		$	634,236		$	561,289
Operating income		9,692			8,007			16,423			21,161

Foreign dredging revenue of $38,042 and $127,280 for the three and nine months ended September 30, 2015, respectively, was primarily attributable to work done in the Middle East and Brazil. Foreign dredging revenue for the three and nine months ended September 30, 2014 was $40,040 and $85,691, respectively.

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

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+ Details

Subsequent Events

9 Months Ended

Sep. 30, 2015

Subsequent Events [Abstract]

Subsequent Events

13.

Subsequent events

Jonathan W. Berger, Chief Executive Officer and director of the Company notified the Board on October 11, 2015 of his intention to retire, effective as of the earlier of April 13, 2017 and a date chosen by the Board. The Company is in the process of identifying a successor to fill the vacancy that will be created by Mr. Berger’s retirement and will engage an executive search firm to assist in the identification and assessment of internal and external candidates.

Nathan D. Leight tendered his resignation as director and Chairman of the Board and Denise E. Dickins tendered her resignation as director and Chair of the Audit Committee of the Company, in each case effective as of October 13, 2015. On October 16, 2015, the Board elected Robert Uhler as a director.

Effective November 10, 2015, Maryann A. Waryjas, Senior Vice President, Chief Legal Officer and Corporate Secretary of the Company, will resign from her positions with the Company.

Subsidiary Guarantors

9 Months Ended

Sep. 30, 2015

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Subsidiary Guarantors

14.

Subsidiary guarantors

The Company’s long-term debt at September 30, 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 September 30, 2015 and December 31, 2014;

(ii)

statements of operations and comprehensive income (loss) for the three and nine months ended September 30, 2015 and 2014; and

(iii)

statements of cash flows for the nine months ended September 30, 2015 and 2014.

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF SEPTEMBER 30, 2015
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	8,814		$	605	$	2	$	—		$	9,421
Accounts receivable — net		142,042			1,842		—		—			143,884
Contract revenues in excess of billings		63,882			2,877		—		—			66,759
Inventories		37,250			—		—		—			37,250
Prepaid expenses and other current assets		60,735			339		15,797		—			76,871
Total current assets		312,723			5,663		15,799		—			334,185

PROPERTY AND EQUIPMENT—Net		423,140			17		—		—			423,157
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		86,900			—		—		—			86,900
INVENTORIES — Noncurrent		37,508			—		—		—			37,508
INVESTMENTS IN JOINT VENTURES		12,319			—		—		—			12,319
RECEIVABLES FROM AFFILIATES		14,907			3,449		54,028		(72,384	)		—
INVESTMENTS IN SUBSIDIARIES		3,684			—		638,506		(642,190	)		—
OTHER		7,981			3		3,918		—			11,902
TOTAL	$	899,162		$	9,132	$	712,251	$	(714,574	)	$	905,971

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	109,019		$	558	$	384	$	—		$	109,961
Accrued expenses		59,195			596		4,187		—			63,978
Billings in excess of contract revenues		6,296			155		—		—			6,451
Current portion of long term debt		1,416			—		6,953		—			8,369
Total current liabilities		175,926			1,309		11,524		—			188,759

7 3/8% SENIOR NOTES		—			—		274,902		—			274,902
REVOLVING CREDIT FACILITY		—			—		28,000		—			28,000
NOTES PAYABLE		356			—		51,752		—			52,108
DEFERRED INCOME TAXES		(521	)		—		89,776		—			89,255
PAYABLES TO AFFILIATES		67,685			924		3,775		(72,384	)		—
OTHER		20,425			—		439		—			20,864
Total liabilities		263,871			2,233		460,168		(72,384	)		653,888

TOTAL EQUITY		635,291			6,899		252,083		(642,190	)		252,083
TOTAL	$	899,162		$	9,132	$	712,251	$	(714,574	)	$	905,971

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 SEPTEMBER 30, 2015
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	216,993		$	4,402		$	—		$	(593	)	$	220,802
Costs of contract revenues		(193,955	)		(3,355	)		—			593			(196,717	)
Gross profit		23,038			1,047			—			—			24,085

OPERATING EXPENSES:
General and administrative expenses		15,277			—			—			—			15,277
Impairment of goodwill		—			—			—			—			—
Gain on sale of assets—net		(884	)		—			—			—			(884	)
Operating income		8,645			1,047			—			—			9,692

Interest expense—net		(90	)		—			(7,203	)		—			(7,293	)
Equity in earnings of subsidiaries		2			—			8,144			(8,146	)		—
Equity in loss of joint ventures		(2,051	)		—			—			—			(2,051	)
Other expense		706			—			—			—			706


Income before income taxes		7,212			1,047			941			(8,146	)		1,054

Income tax (provision) benefit		7			(120	)		(629	)		—			(742	)

Net income	$	7,219		$	927			312			(8,146	)		312


Comprehensive income (loss)	$	7,219		$	288		$	(327	)	$	(7,507	)	$	(327	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2014
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	198,934		$	3,264		$	—		$	—		$	202,198
Costs of contract revenues		(170,911	)		(6,828	)		—			—			(177,739	)
Gross profit		28,023			(3,564	)		—			—			24,459

OPERATING EXPENSES:
General and administrative expenses		15,988			1			73			—			16,062
Loss on sale of assets—net		390			—			—			—			390
Operating income (loss)		11,645			(3,565	)		(73	)		—			8,007

Interest expense—net		(60	)		—			(4,642	)		—			(4,702	)
Equity in earnings of subsidiaries		54			—			3,316			(3,370	)		—
Equity in loss of joint ventures		(5,785	)		—			—			—			(5,785	)
Other expense		384			—			—			—			384

Income from continuing operations before income taxes		6,238			(3,565	)		(1,399	)		(3,370	)		(2,096	)

Income tax benefit		697			—			372			—			1,069

Income (loss) from continuing operations		6,935			(3,565	)		(1,027	)		(3,370	)		(1,027	)
Loss from discontinued operations, net of income taxes		(1,059	)		—			(1,059	)		1,059			(1,059	)
Net income (loss)	$	5,876		$	(3,565	)	$	(2,086	)	$	(2,311	)	$	(2,086	)


Comprehensive income (loss)	$	5,707		$	(3,981	)	$	(2,671	)	$	(1,726	)	$	(2,671	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2015
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	624,498		$	11,912		$	—		$	(2,174	)	$	634,236
Costs of contract revenues		(558,343	)		(11,013	)		—			2,174			(567,182	)
Gross profit		66,155			899			—			—			67,054

OPERATING EXPENSES:
General and administrative expenses		48,768			—			—			—			48,768
Impairment of goodwill		2,750			—			—			—			2,750
Gain on sale of assets—net		(887	)		—			—			—			(887	)
Operating income		15,524			899			—			—			16,423

Interest expense—net		(349	)		—			(18,141	)		—			(18,490	)
Equity in earnings of subsidiaries		6			—			9,663			(9,669	)		—
Equity in loss of joint ventures		(5,765	)		—			—			—			(5,765	)
Other expense		(346	)		(7	)		—			—			(353	)

Income (loss) before income taxes		9,070			892			(8,478	)		(9,669	)		(8,185	)

Income tax (provision) benefit		7			(300	)		3,124			—			2,831

Net income (loss)	$	9,077		$	592		$	(5,354	)	$	(9,669	)	$	(5,354	)


Comprehensive income (loss)	$	9,077		$	(802	)	$	(6,748	)	$	(8,275	)	$	(6,748	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2014
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	540,199		$	21,090		$	—		$	—		$	561,289
Costs of contract revenues		(463,718	)		(26,002	)		—			—			(489,720	)
Gross profit		76,481			(4,912	)		—			—			71,569

OPERATING EXPENSES:
General and administrative expenses		49,776			1			73			—			49,850
Loss on sale of assets—net		558			—			—			—			558
Operating income (loss)		26,147			(4,913	)		(73	)		—			21,161

Interest income (expense)—net		91			(261	)		(14,560	)		—			(14,730	)
Equity in earnings (loss) of subsidiaries		(52	)		—			15,915			(15,863	)		—
Equity in loss of joint ventures		(9,063	)		—			—			—			(9,063	)
Gain on bargain purchase acquisition		2,197			—			—			—			2,197
Other income		403			7			—			—			410

Income (loss) from continuing operations before income taxes		19,723			(5,167	)		1,282			(15,863	)		(25	)

Income tax (provision) benefit		1,307			—			(882	)		—			425

Income (loss) from continuing operations		21,030			(5,167	)		400			(15,863	)		400
Loss from discontinued operations, net of income taxes		(9,118	)		(1,343	)		(9,118	)		10,461			(9,118	)
Net income (loss)	$	11,912		$	(6,510	)	$	(8,718	)	$	(5,402	)	$	(8,718	)

Comprehensive income (loss)	$	11,713		$	(6,899	)	$	(9,306	)	$	(4,814	)	$	(9,306	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2015
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Cash provided by (used in) operating activities		15,013			(1,308	)		(17,602	)		—			(3,897	)

INVESTING ACTIVITIES:
Purchases of property and equipment		(53,394	)		—			—			—			(53,394	)
Proceeds from dispositions of property and equipment		1,167			—			—			—			1,167
Net change in accounts with affiliates		(29,059	)		—			(9,839	)		38,898			—
Net cash flows used in investing activities		(81,286	)		—			(9,839	)		38,898			(52,227	)

FINANCING ACTIVITIES:
Deferred financing fees		—			—			(29	)		—			(29	)
Repayments of long term note payable		—			—			(488	)		—			(488	)
Taxes paid on settlement of vested share awards		—			—			(265	)		—			(265	)
Repayments of term loan facility		—			—			(3,750	)		—			(3,750	)
Repayments of equipment debt		(853	)		—			—			—			(853	)
Proceeds from equipment debt		—			—			410			—			410
Net change in accounts with affiliates		17,416			1,355			20,127			(38,898	)		—
Capital contributions		16,800			—			(16,800	)		—			—
Exercise of options and purchases from employee stock plans		—			—			1,356			—			1,356
Excess income tax benefit from share-based compensation		—			—			(13	)		—			(13	)
Treasury stock		—			—			(1,107	)		—			(1,107	)
Borrowings under revolving loans		—			—			146,000			—			146,000
Repayments of revolving loans		—			—			(118,000	)		—			(118,000	)

Net cash flows provided by financing activities		33,363			1,355			27,441			(38,898	)		23,261

Effect of foreign currency exchange rates on cash and cash equivalents		—			(105	)		—			—			(105	)

Net increase (decrease) in cash and cash equivalents		(32,910	)		(58	)		—			—			(32,968	)

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

Cash and cash equivalents at end of period	$	8,814		$	605		$	2		$	—		$	9,421

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 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	$	24,488		$	(3,357	)	$	(5,840	)	$	—		$	15,291
Net cash flows used in operating activities of discontinued operations		(4,000	)		(1,024	)		—			—			(5,024	)
Cash provided by (used in) operating activities		20,488			(4,381	)		(5,840	)		—			10,267

INVESTING ACTIVITIES:
Purchases of property and equipment		(66,433	)		—			—			—			(66,433	)
Proceeds from dispositions of property and equipment		1,614			—			—			—			1,614
Proceeds from vendor performance obligations		(3,100	)		—			—			—			(3,100	)
Payments for acquisitions of businesses		(2,048	)		—			—			—			(2,048	)
Net change in accounts with affiliates		(9,402	)		—			—			9,402			—

Net cash flows used in investing activities of continuing operations		(79,369	)		—			—			9,402			(69,967	)
Net cash flows provided by investing activities of discontinued operations		5,275			—			—			—			5,275
Cash used in investing activities		(74,094	)		—			—			9,402			(64,692	)

FINANCING ACTIVITIES:
Deferred financing fees		—			—			(845	)		—			(845	)
Purchase of noncontrolling interest		—			—			(205	)		—			(205	)
Taxes paid on settlement of vested share awards		—			—			(501	)		—			(501	)
Repayment of equipment debt		(121	)		—			—			—			(121	)
Net change in accounts with affiliates		—			3,595			5,807			(9,402	)		—
Exercise of options and purchases from employee stock plans		—			—			1,542			—			1,542
Excess income tax benefit from share-based compensation		—			—			45			—			45
Borrowings under revolving loans		—			—			105,000			—			105,000
Repayments of revolving loans		—			—			(105,000	)		—			(105,000	)

Cash provided by (used in) financing activities		(121	)		3,595			5,843			(9,402	)		(85	)

Effect of foreign currency exchange rates on cash and cash equivalents		—			260			—			—			260

Net increase (decrease) in cash and cash equivalents		(53,727	)		(526	)		3			—			(54,250	)

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

Cash and cash equivalents at end of period	$	18,212		$	2,873		$	3		$	—		$	21,088

Earnings per share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Computations For Basic And Diluted Earnings Per Share

The computations for basic and diluted earnings (loss) per share from continuing operations are as follows:

	Three Months Ended					Nine Months Ended
(shares in thousands)	September 30,					September 30,
	2015		2014			2015			2014
Income (loss) from continuing operations	$	312	$	(1,027	)	$	(5,354	)	$	400
Loss on discontinued operations, net of income taxes		—		(1,059	)		—			(9,118	)
Net income (loss)		312		(2,086	)		(5,354	)		(8,718	)

Weighted-average common shares outstanding — basic		60,496		60,040			60,411			59,870
Effect of stock options and restricted stock units		345		—			—			621

Weighted-average common shares outstanding — diluted		60,841		60,040			60,411			60,491

Earnings (loss) per share from continuing operations — basic	$	—	$	(0.01	)	$	(0.09	)	$	0.01
Earnings (loss) per share from continuing operations — diluted	$	—	$	(0.01	)	$	(0.09	)	$	0.01

Accounts Receivable And Contracts In Progress (Tables)

9 Months Ended

Sep. 30, 2015

Receivables [Abstract]

Schedule Of Accounts Receivable

Accounts receivable at September 30, 2015 and December 31, 2014 are as follows:

	September 30,			December 31,
	2015			2014
Completed contracts	$	26,672		$	15,342
Contracts in progress		92,298			72,459
Retainage		27,445			27,371
		146,415			115,172
Allowance for doubtful accounts		(678	)		(578	)

Total accounts receivable—net	$	145,737		$	114,594

Current portion of accounts receivable—net	$	143,884		$	113,188
Long-term accounts receivable and retainage		1,853			1,406
Total accounts receivable—net	$	145,737		$	114,594

Components Of Contracts In Progress

The components of contracts in progress at September 30, 2015 and December 31, 2014 are as follows:

	September 30,			December 31,
	2015			2014
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	626,318		$	833,368
Amounts billed		(572,687	)		(759,877	)
Costs and earnings in excess of billings for contracts in progress		53,631			73,491

Costs and earnings in excess of billings for completed contracts		13,128			9,066

Total contract revenues in excess of billings	$	66,759		$	82,557

Billings in excess of costs and earnings:
Amounts billed	$	(90,640	)	$	(181,698	)
Costs and earnings for contracts in progress		84,189			177,059

Total billings in excess of contract revenues	$	(6,451	)	$	(4,639	)

Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2015

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses at September 30, 2015 and December 31, 2014 are as follows:

	September 30,		December 31,
	2015		2014

Insurance	$	17,408	$	16,778
Accumulated deficit in joint ventures		13,919		10,383
Payroll and employee benefits		10,246		8,808
Income and other taxes		4,252		5,857
Interest		3,984		8,270
Percentage of completion adjustment		2,829		1,870
Fuel hedge contracts		1,550		3,029
Other		9,790		15,046
Total accrued expenses	$	63,978	$	70,041

Impairment Of Goodwill (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The change in the carrying value of goodwill for the period ended September 30, 2015 is as follows:

	Dredging Segment		Environmental & Remediation Segment			Total
Balance — December 31, 2014	$	76,576	$	9,750		$	86,326

Impairment of goodwill		—		(2,750	)		(2,750	)

BALANCE—September 30, 2015	$	76,576	$	7,000		$	83,576

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

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

The fair values of these financial instruments are summarized as follows:

			Fair Value Measurements at Reporting Date Using
Description	At September 30, 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	$	1,550	$	—	$	1,550	$	—

			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

The fair value of the fuel hedge contracts outstanding as of September 30, 2015 and December 31, 2014 is as follows:

		Fair Value at
		September 30,		December 31,
	Balance Sheet Location	2015		2014
Liability derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	1,550	$	3,029

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

The fair value of goodwill was determined using quantitative models that contained significant unobservable inputs.

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2015
Goodwill
Balance at January 1,	$	86,326
Impairment of goodwill		(2,750	)
Balance at September 30,	$	83,576

Changes In Components Of Accumulated Other Comprehensive Loss

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

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
Cumulative translation adjustments—net of tax	$	(639	)	$	(416	)	$	(1,394	)	$	(389	)
Derivatives:
Reclassification of derivative gains to earnings—net of tax		—			(306	)		—			(332	)
Change in fair value of derivatives—net of tax		—			136			—			132
Net unrealized gain on derivatives—net of tax		—			(169	)		—			(199	)
Total other comprehensive loss	$	(639	)	$	(585	)	$	(1,394	)	$	(588	)

Adjustments Reclassified From Accumulated Other Comprehensive Loss To Earnings

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

		Three Months Ended			Nine Months Ended
		September 30,			September 30,
	Statement of Operations Location	2014			2014
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	(241	)	$	(286	)
	Income tax benefit		65			46
		$	(306	)	$	(332	)

Business Dispositions (Tables)

9 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

Schedule Of Discontinued Operation

	Three Months Ended			Nine Months Ended
	September 30,			September 30,
	2014			2014

Revenue	$	—		$	14,439

Loss before income taxes from discontinued operations	$	(1,053	)	$	(18,393	)
Income tax (provision) benefit		(6	)		9,275
Loss from discontinued operations, net of income taxes	$	(1,059	)	$	(9,118	)

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1474-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721683-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=51719941&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721663-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721659-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721671-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721677-107760

+ Details

Segment Information (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Segment Reporting By Segment

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
Dredging
Contract revenues	$	162,526		$	167,079		$	506,700		$	486,153
Operating income		19,598			5,733			45,587			24,157

Environmental & remediation
Contract revenues	$	60,451		$	37,182		$	131,929		$	79,224
Operating income (loss)		(9,906	)		2,274			(29,164	)		(2,996	)

Intersegment revenues	$	(2,175	)	$	(2,063	)		(4,393	)		(4,088	)
Total
Contract revenues	$	220,802		$	202,198		$	634,236		$	561,289
Operating income		9,692			8,007			16,423			21,161

Subsidiary Guarantors (Tables)

9 Months Ended

Sep. 30, 2015

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Condensed Consolidating of Balance Sheet

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF SEPTEMBER 30, 2015
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	8,814		$	605	$	2	$	—		$	9,421
Accounts receivable — net		142,042			1,842		—		—			143,884
Contract revenues in excess of billings		63,882			2,877		—		—			66,759
Inventories		37,250			—		—		—			37,250
Prepaid expenses and other current assets		60,735			339		15,797		—			76,871
Total current assets		312,723			5,663		15,799		—			334,185

PROPERTY AND EQUIPMENT—Net		423,140			17		—		—			423,157
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		86,900			—		—		—			86,900
INVENTORIES — Noncurrent		37,508			—		—		—			37,508
INVESTMENTS IN JOINT VENTURES		12,319			—		—		—			12,319
RECEIVABLES FROM AFFILIATES		14,907			3,449		54,028		(72,384	)		—
INVESTMENTS IN SUBSIDIARIES		3,684			—		638,506		(642,190	)		—
OTHER		7,981			3		3,918		—			11,902
TOTAL	$	899,162		$	9,132	$	712,251	$	(714,574	)	$	905,971

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	109,019		$	558	$	384	$	—		$	109,961
Accrued expenses		59,195			596		4,187		—			63,978
Billings in excess of contract revenues		6,296			155		—		—			6,451
Current portion of long term debt		1,416			—		6,953		—			8,369
Total current liabilities		175,926			1,309		11,524		—			188,759

7 3/8% SENIOR NOTES		—			—		274,902		—			274,902
REVOLVING CREDIT FACILITY		—			—		28,000		—			28,000
NOTES PAYABLE		356			—		51,752		—			52,108
DEFERRED INCOME TAXES		(521	)		—		89,776		—			89,255
PAYABLES TO AFFILIATES		67,685			924		3,775		(72,384	)		—
OTHER		20,425			—		439		—			20,864
Total liabilities		263,871			2,233		460,168		(72,384	)		653,888

TOTAL EQUITY		635,291			6,899		252,083		(642,190	)		252,083
TOTAL	$	899,162		$	9,132	$	712,251	$	(714,574	)	$	905,971

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 SEPTEMBER 30, 2015
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	216,993		$	4,402		$	—		$	(593	)	$	220,802
Costs of contract revenues		(193,955	)		(3,355	)		—			593			(196,717	)
Gross profit		23,038			1,047			—			—			24,085

OPERATING EXPENSES:
General and administrative expenses		15,277			—			—			—			15,277
Impairment of goodwill		—			—			—			—			—
Gain on sale of assets—net		(884	)		—			—			—			(884	)
Operating income		8,645			1,047			—			—			9,692

Interest expense—net		(90	)		—			(7,203	)		—			(7,293	)
Equity in earnings of subsidiaries		2			—			8,144			(8,146	)		—
Equity in loss of joint ventures		(2,051	)		—			—			—			(2,051	)
Other expense		706			—			—			—			706


Income before income taxes		7,212			1,047			941			(8,146	)		1,054

Income tax (provision) benefit		7			(120	)		(629	)		—			(742	)

Net income	$	7,219		$	927			312			(8,146	)		312


Comprehensive income (loss)	$	7,219		$	288		$	(327	)	$	(7,507	)	$	(327	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2014
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	198,934		$	3,264		$	—		$	—		$	202,198
Costs of contract revenues		(170,911	)		(6,828	)		—			—			(177,739	)
Gross profit		28,023			(3,564	)		—			—			24,459

OPERATING EXPENSES:
General and administrative expenses		15,988			1			73			—			16,062
Loss on sale of assets—net		390			—			—			—			390
Operating income (loss)		11,645			(3,565	)		(73	)		—			8,007

Interest expense—net		(60	)		—			(4,642	)		—			(4,702	)
Equity in earnings of subsidiaries		54			—			3,316			(3,370	)		—
Equity in loss of joint ventures		(5,785	)		—			—			—			(5,785	)
Other expense		384			—			—			—			384

Income from continuing operations before income taxes		6,238			(3,565	)		(1,399	)		(3,370	)		(2,096	)

Income tax benefit		697			—			372			—			1,069

Income (loss) from continuing operations		6,935			(3,565	)		(1,027	)		(3,370	)		(1,027	)
Loss from discontinued operations, net of income taxes		(1,059	)		—			(1,059	)		1,059			(1,059	)
Net income (loss)	$	5,876		$	(3,565	)	$	(2,086	)	$	(2,311	)	$	(2,086	)


Comprehensive income (loss)	$	5,707		$	(3,981	)	$	(2,671	)	$	(1,726	)	$	(2,671	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2015
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	624,498		$	11,912		$	—		$	(2,174	)	$	634,236
Costs of contract revenues		(558,343	)		(11,013	)		—			2,174			(567,182	)
Gross profit		66,155			899			—			—			67,054

OPERATING EXPENSES:
General and administrative expenses		48,768			—			—			—			48,768
Impairment of goodwill		2,750			—			—			—			2,750
Gain on sale of assets—net		(887	)		—			—			—			(887	)
Operating income		15,524			899			—			—			16,423

Interest expense—net		(349	)		—			(18,141	)		—			(18,490	)
Equity in earnings of subsidiaries		6			—			9,663			(9,669	)		—
Equity in loss of joint ventures		(5,765	)		—			—			—			(5,765	)
Other expense		(346	)		(7	)		—			—			(353	)

Income (loss) before income taxes		9,070			892			(8,478	)		(9,669	)		(8,185	)

Income tax (provision) benefit		7			(300	)		3,124			—			2,831

Net income (loss)	$	9,077		$	592		$	(5,354	)	$	(9,669	)	$	(5,354	)


Comprehensive income (loss)	$	9,077		$	(802	)	$	(6,748	)	$	(8,275	)	$	(6,748	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2014
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	540,199		$	21,090		$	—		$	—		$	561,289
Costs of contract revenues		(463,718	)		(26,002	)		—			—			(489,720	)
Gross profit		76,481			(4,912	)		—			—			71,569

OPERATING EXPENSES:
General and administrative expenses		49,776			1			73			—			49,850
Loss on sale of assets—net		558			—			—			—			558
Operating income (loss)		26,147			(4,913	)		(73	)		—			21,161

Interest income (expense)—net		91			(261	)		(14,560	)		—			(14,730	)
Equity in earnings (loss) of subsidiaries		(52	)		—			15,915			(15,863	)		—
Equity in loss of joint ventures		(9,063	)		—			—			—			(9,063	)
Gain on bargain purchase acquisition		2,197			—			—			—			2,197
Other income		403			7			—			—			410

Income (loss) from continuing operations before income taxes		19,723			(5,167	)		1,282			(15,863	)		(25	)

Income tax (provision) benefit		1,307			—			(882	)		—			425

Income (loss) from continuing operations		21,030			(5,167	)		400			(15,863	)		400
Loss from discontinued operations, net of income taxes		(9,118	)		(1,343	)		(9,118	)		10,461			(9,118	)
Net income (loss)	$	11,912		$	(6,510	)	$	(8,718	)	$	(5,402	)	$	(8,718	)

Comprehensive income (loss)	$	11,713		$	(6,899	)	$	(9,306	)	$	(4,814	)	$	(9,306	)

Condensed Cash Flow Statement

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2015
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Cash provided by (used in) operating activities		15,013			(1,308	)		(17,602	)		—			(3,897	)

INVESTING ACTIVITIES:
Purchases of property and equipment		(53,394	)		—			—			—			(53,394	)
Proceeds from dispositions of property and equipment		1,167			—			—			—			1,167
Net change in accounts with affiliates		(29,059	)		—			(9,839	)		38,898			—
Net cash flows used in investing activities		(81,286	)		—			(9,839	)		38,898			(52,227	)

FINANCING ACTIVITIES:
Deferred financing fees		—			—			(29	)		—			(29	)
Repayments of long term note payable		—			—			(488	)		—			(488	)
Taxes paid on settlement of vested share awards		—			—			(265	)		—			(265	)
Repayments of term loan facility		—			—			(3,750	)		—			(3,750	)
Repayments of equipment debt		(853	)		—			—			—			(853	)
Proceeds from equipment debt		—			—			410			—			410
Net change in accounts with affiliates		17,416			1,355			20,127			(38,898	)		—
Capital contributions		16,800			—			(16,800	)		—			—
Exercise of options and purchases from employee stock plans		—			—			1,356			—			1,356
Excess income tax benefit from share-based compensation		—			—			(13	)		—			(13	)
Treasury stock		—			—			(1,107	)		—			(1,107	)
Borrowings under revolving loans		—			—			146,000			—			146,000
Repayments of revolving loans		—			—			(118,000	)		—			(118,000	)

Net cash flows provided by financing activities		33,363			1,355			27,441			(38,898	)		23,261

Effect of foreign currency exchange rates on cash and cash equivalents		—			(105	)		—			—			(105	)

Net increase (decrease) in cash and cash equivalents		(32,910	)		(58	)		—			—			(32,968	)

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

Cash and cash equivalents at end of period	$	8,814		$	605		$	2		$	—		$	9,421

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 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	$	24,488		$	(3,357	)	$	(5,840	)	$	—		$	15,291
Net cash flows used in operating activities of discontinued operations		(4,000	)		(1,024	)		—			—			(5,024	)
Cash provided by (used in) operating activities		20,488			(4,381	)		(5,840	)		—			10,267

INVESTING ACTIVITIES:
Purchases of property and equipment		(66,433	)		—			—			—			(66,433	)
Proceeds from dispositions of property and equipment		1,614			—			—			—			1,614
Proceeds from vendor performance obligations		(3,100	)		—			—			—			(3,100	)
Payments for acquisitions of businesses		(2,048	)		—			—			—			(2,048	)
Net change in accounts with affiliates		(9,402	)		—			—			9,402			—

Net cash flows used in investing activities of continuing operations		(79,369	)		—			—			9,402			(69,967	)
Net cash flows provided by investing activities of discontinued operations		5,275			—			—			—			5,275
Cash used in investing activities		(74,094	)		—			—			9,402			(64,692	)

FINANCING ACTIVITIES:
Deferred financing fees		—			—			(845	)		—			(845	)
Purchase of noncontrolling interest		—			—			(205	)		—			(205	)
Taxes paid on settlement of vested share awards		—			—			(501	)		—			(501	)
Repayment of equipment debt		(121	)		—			—			—			(121	)
Net change in accounts with affiliates		—			3,595			5,807			(9,402	)		—
Exercise of options and purchases from employee stock plans		—			—			1,542			—			1,542
Excess income tax benefit from share-based compensation		—			—			45			—			45
Borrowings under revolving loans		—			—			105,000			—			105,000
Repayments of revolving loans		—			—			(105,000	)		—			(105,000	)

Cash provided by (used in) financing activities		(121	)		3,595			5,843			(9,402	)		(85	)

Effect of foreign currency exchange rates on cash and cash equivalents		—			260			—			—			260

Net increase (decrease) in cash and cash equivalents		(53,727	)		(526	)		3			—			(54,250	)

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

Cash and cash equivalents at end of period	$	18,212		$	2,873		$	3		$	—		$	21,088

Basis Of Presentation (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended
Basis Of Presentation (Narrative) (Details) $ in Thousands	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) segment	Dec. 31, 2014 USD ($)
Number of reportable segments \| segment		2
Number of operating Segments \| segment		3
Impairment of goodwill		$ 2,750
Terra Contracting Services [Member]
Impairment of goodwill	$ 2,750
Promissory Note [Member]
Fair value of debt		$ 0	$ 7,013
Maximum [Member]
Average equipment-related costs of total costs of contract revenue		22.00%
Minimum [Member]
Average equipment-related costs of total costs of contract revenue		20.00%

Earnings per share (Narrative) (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	1,170	521	462	500

Earnings per share (Computations For Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 312	$ (1,027)	$ (5,354)	$ 400
Loss on discontinued operations, net of income taxes		(1,059)		(9,118)
Net income (loss)	$ 312	$ (2,086)	$ (5,354)	$ (8,718)
Weighted-average common shares outstanding - basic	60,496	60,040	60,411	59,870
Effect of stock options and restricted stock units	345			621
Weighted-average common shares outstanding - diluted	60,841	60,040	60,411	60,491
Earnings (loss) per share from continuing operations - basic		$ (0.01)	$ (0.09)	$ 0.01
Earnings (loss) per share from continuing operations - diluted		$ (0.01)	$ (0.09)	$ 0.01

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.12)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.14)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1012-107759

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721523-107759

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e957-107759

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 13
-Article 7

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Article 5

+ Details

- Definition

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

+ References + Details

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts Receivable [Line Items]
Retainage	$ 27,445	$ 27,371
Accounts receivable, gross	146,415	115,172
Allowance for doubtful accounts	(678)	(578)
Total accounts receivable-net	145,737	114,594
Current portion of accounts receivable—net	143,884	113,188
Long-term accounts receivable and retainage	1,853	1,406
Completed Contracts [Member]
Accounts Receivable [Line Items]
Completed contracts	26,672	15,342
Contracts In Progress [Member]
Accounts Receivable [Line Items]
Completed contracts	$ 92,298	$ 72,459

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 53,631	$ 73,491
Costs and earnings in excess of billings for completed contracts	13,128	9,066
Total contract revenues in excess of billings	66,759	82,557
Total billings in excess of contract revenues	(6,451)	(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	626,318	833,368
Amounts billed	(572,687)	(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	(90,640)	(181,698)
Billings in excess of costs and earnings, Costs and earnings for contracts in progress	$ 84,189	$ 177,059

Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Insurance	$ 17,408	$ 16,778
Accumulated deficit in joint ventures	13,919	10,383
Payroll and employee benefits	10,246	8,808
Income and other taxes	4,252	5,857
Interest	3,984	8,270
Percentage of completion adjustment	2,829	1,870
Fuel hedge contracts	1,550	3,029
Other	9,790	15,046
Total accrued expenses	$ 63,978	$ 70,041

Long-term debt (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended
Long-term debt (Narrative) (Details) - USD ($)	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Nov. 30, 2014	Nov. 04, 2014	Jun. 04, 2012	Jan. 31, 2011
Debt Instrument [Line Items]
Net book value of related assets		$ 151,593,000
Net Leverage Ratio		4.50%
Fixed Charge Coverage Ratio		1.25%
Line of Credit Facility, Amount Outstanding		$ 28,000,000
Letters of credit outstanding		81,323,000
Letter of credit remaining borrowing capacity		100,677,000
Borrowed aggregate principal amount						$ 47,360,000
Purchases of property and equipment		53,394,000	$ 66,433,000
Long-term Debt, Current Maturities		8,369,000		$ 5,859,000
7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 275,000,000			$ 275,000,000			$ 275,000,000
Stated interest rate		7.375%			7.375%			7.375%
Maturity date		Feb. 01, 2019
7.375% Senior Notes Due In 2019 [Member] \| If Redeemed In 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		103.70%
7.375% Senior Notes Due In 2019 [Member] \| If Redeemed In 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.80%
7.375% Senior Notes Due In 2019 [Member] \| If Redeemed After 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Net book value of related assets		$ 49,838,000
Debt instrument, face amount						$ 50,000,000
Term Loan number of years		5 years
Term loan facility bear interest fixed rate		4.655%
Debt Instrument, Interest Rate, Increase (Decrease)		2.00%
Percentage of principal to be repaid yearly during first two years of term		10.00%
Percentage of principal to be repaid yearly during third and fourth years of term		20.00%
Percentage of principal to be repaid during fifth year of term		25.00%
Vessels and Ancillary Equipment [Member]
Debt Instrument [Line Items]
Purchases of property and equipment	$ 15,569,000
Operating leases expiration year		2023
Long-term Debt, Current Maturities	3,239,000
Long-term Debt, Excluding Current Maturities	$ 14,361,000
Vessels and Ancillary Equipment [Member] \| 5.75% Senior Notes Due In 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate	5.75%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 210,000,000
Line of credit facility optional increase capacity							15,000,000
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 June 30, 2015 of $155,526. Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the revolving credit facility will bear interest at the option of the Company at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum.
Line of Credit Facility, Amount Outstanding		$ 28,000,000
Revolving Credit Facility [Member] \| Maximum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.50%
Revolving Credit Facility [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Revolving Credit Facility [Member] \| Minimum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Revolving Credit Facility [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Multicurrency [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							50,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 10,000,000

Impairment Of Goodwill (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015
Impairment of goodwill		$ 2,750
Terra Contracting Services [Member]
Impairment of goodwill	$ 2,750

Impairment Of Goodwill (Change In The Carrying Amount Of Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 86,326
Impairment of goodwill	(2,750)
Goodwill, Ending Balance	83,576
Dredging Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	76,576
Goodwill, Ending Balance	76,576
Environmental & Remediation Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	9,750
Impairment of goodwill	(2,750)
Goodwill, Ending Balance	$ 7,000

Fair Value Measurements (Fair Value Measurements At Reporting Date Using) (Details) - Fuel Hedge Contracts [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,550	$ 3,029
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,550	$ 3,029

Fair Value Measurements (Narrative) (Details) gal in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) Contract $ / gal gal	Dec. 31, 2014 USD ($)	Nov. 30, 2014 USD ($)	Jan. 31, 2011 USD ($)
Derivatives, Fair Value [Line Items]
Derivative underlying hedge percent		80.00%
Derivative, Nonmonetary Notional Amount, Volume \| gal		8.0
Fair value hedge liabilities		$ 1,550,000	$ 3,029,000
Impairment of goodwill		2,750,000
7.375% Senior Notes Due In 2019 [Member]
Derivatives, Fair Value [Line Items]
Debt instrument, face amount		$ 275,000,000		$ 275,000,000	$ 275,000,000
Stated interest rate		7.375%		7.375%	7.375%
Maturity date		Feb. 01, 2019
7.375% Senior Notes Due In 2019 [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Fair value of debt		$ 275,688,000
Terra Contracting Services [Member]
Derivatives, Fair Value [Line Items]
Impairment of goodwill	$ 2,750,000
Minimum [Member]
Derivatives, Fair Value [Line Items]
Fixed price range \| $ / gal		1.67
Maximum [Member]
Derivatives, Fair Value [Line Items]
Fixed price range \| $ / gal		2.11
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Number of outstanding contracts \| Contract		0

Fair Value Measurements (Schedule of Balance Sheet Location Fuel Hedge Contracts) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross liability	$ 1,550	$ 3,029
Fuel Hedge Contracts [Member] \| Designated as Hedging Instrument [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross liability	$ 1,550	$ 3,029

Fair Value Measurements (Fair Value Measurements Using Significant Unobservable) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Impairment of goodwill	$ (2,750)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	86,326
Impairment of goodwill	(2,750)
Ending balance	$ 83,576

Fair Value Measurements (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2015

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Cumulative translation adjustments—net of tax

^[1]

$ (639)

$ (416)

$ (1,394)

$ (389)

Reclassification of derivative gains to earnings—net of tax

(306)

(332)

Change in fair value of derivatives—net of tax

136

132

Net unrealized gain on derivatives—net of tax

^[2]

(169)

(199)

Other comprehensive loss—net of tax

$ (639)

$ (585)

$ (1,394)

$ (588)

[1]	Net of income tax benefit of $422 and $276 for the three months ended September 30, 2015 and 2014, respectively and $922 and $259 for nine months ended September 30, 2015 and 2014, respectively.
[2]	Net of income tax expense of $111 and $132 for the three and nine months ended September 30, 2014, respectively.

Fair Value Measurements (Adjustments Reclassified From Accumulated Balances Other Comprehensive Loss To Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Costs of contract revenues	$ (196,717)	$ (177,739)	$ (567,182)	$ (489,720)
Income tax (provision) benefit	(742)	1,069	2,831	425
Net income (loss)	$ 312	(2,086)	$ (5,354)	(8,718)
Fuel Hedge Contracts [Member] \| Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges \| Reclassification Out Of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Costs of contract revenues		(241)		(286)
Income tax (provision) benefit		65		46
Net income (loss)		$ (306)		$ (332)

- Definition

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

+ References + Details

Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units	698
Share-based compensation expense		$ 839	$ 828	$ 2,897	$ 1,816
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		5,800

Commitments And Contingencies (Details) - USD ($)		1 Months Ended		9 Months Ended
Commitments And Contingencies (Details) - USD ($)	Jan. 14, 2015	Jan. 31, 2014	May 31, 2013	Sep. 30, 2015
Commitments And Contingencies [Line Items]
Outstanding performance bonds				$ 1,066,169,000
Revenue value remaining from outstanding performance bonds				455,712,000
Proceeds from Legal Settlements	$ 5,309,000
Proceeds from Lines of Credit			$ 13,600,000
Gain (Loss) Related to Litigation Settlement		$ 10,500,000
Funds remitted		$ 3,100,000
Discontinued Operations [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds				45,582,000
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

Investments (Details) - USD ($) $ in Thousands	6 Months Ended
Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]
Accumulated deficit in joint ventures		$ 13,919	$ 10,383
TerraSea Environmental Solutions [Member]
Schedule Of Equity Method Investments [Line Items]
Other current assets		28,974	22,898
Accumulated deficit in joint ventures		$ 13,919	$ 10,383
Provision for losses to be assumed	$ 1,506
Ownership percentage		50.00%
Amboy Aggregates [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage		50.00%

Business Dispositions (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
Business Dispositions (Details) - USD ($) $ in Thousands	Apr. 23, 2014	Sep. 30, 2014	Sep. 30, 2014
Discontinued Operations And Disposal Groups [Abstract]
Revenue			$ 14,439
Loss before income taxes from discontinued operations		$ (1,053)	(18,393)
Income tax (provision) benefit		(6)	9,275
Loss from discontinued operations, net of income taxes		$ (1,059)	$ (9,118)
Proceeds from Divestiture of Businesses	$ 5,309

- Definition

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

+ References

+ Details

Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
Segment Information (Narrative) (Details) $ in Thousands	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			2
Contract revenues	$ 220,802	$ 202,198	$ 634,236	$ 561,289
Dredging Segment [Member] \| Foreign [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 38,042	$ 40,040	$ 127,280	$ 85,691

Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Contract revenues	$ 220,802	$ 202,198	$ 634,236	$ 561,289
Operating income (loss)	9,692	8,007	16,423	21,161
Dredging Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	19,598	5,733	45,587	24,157
Environmental & Remediation Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(9,906)	2,274	(29,164)	(2,996)
Operating Segment [Member] \| Dredging Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	162,526	167,079	506,700	486,153
Operating Segment [Member] \| Environmental & Remediation Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	60,451	37,182	131,929	79,224
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ (2,175)	$ (2,063)	$ (4,393)	$ (4,088)

Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Senior Notes	$ 274,902	$ 274,880
Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Senior notes interest rate	7.375%
Owned Domestic Subsidiaries Percent	100.00%

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 9,421	$ 42,389	$ 21,088	$ 75,338
Accounts receivable—net	143,884	113,188
Contract revenues in excess of billings	66,759	82,557
Inventories	37,250	34,735
Prepaid expenses and other current assets	76,871	69,375
Total current assets	334,185	342,244
PROPERTY AND EQUIPMENT—Net	423,157	399,445
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	86,900	95,289
INVENTORIES—Noncurrent	37,508	36,262
INVESTMENTS IN JOINT VENTURES	12,319	7,889
OTHER	11,902	12,105
TOTAL	905,971	893,234
LIABILITIES AND EQUITY
Accounts payable	109,961	119,971
Accrued expenses	63,978	70,041
Billings in excess of contract revenues	6,451	4,639
Current portion of long term debt	8,369	5,859
Total current liabilities	188,759	200,510
7 3/8% SENIOR NOTES	274,902	274,880
REVOLVING CREDIT FACILITY	28,000
NOTES PAYABLE	52,108	49,497
DEFERRED INCOME TAXES	89,255	92,007
OTHER	20,864	20,377
Total liabilities	653,888	637,271
EQUITY:
Total equity	252,083	255,963	235,554	242,101
TOTAL	905,971	893,234
Eliminations [Member]
ASSETS
Accounts receivable—net		(2,906)
Receivables from affiliates		(212,300)
Contract revenues in excess of billings		(310)
Total current assets		(215,516)
RECEIVABLES FROM AFFILIATES	(72,384)
INVESTMENTS IN SUBSIDIARIES	(642,190)	(622,977)
TOTAL	(714,574)	(838,493)
LIABILITIES AND EQUITY
Accounts payable		(3,216)
Payables to affiliates		(212,300)
Total current liabilities		(215,516)
PAYABLES TO AFFILIATES	(72,384)
Total liabilities	(72,384)	(215,516)
EQUITY:
Total equity	(642,190)	(622,977)
TOTAL	(714,574)	(838,493)
Subsidiary Guarantors [Member]
ASSETS
Cash and cash equivalents	8,814	41,724	18,212	71,939
Accounts receivable—net	142,042	115,739
Receivables from affiliates		152,822
Contract revenues in excess of billings	63,882	78,631
Inventories	37,250	34,735
Prepaid expenses and other current assets	60,735	54,327
Total current assets	312,723	477,978
PROPERTY AND EQUIPMENT—Net	423,140	399,421
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	86,900	95,289
INVENTORIES—Noncurrent	37,508	36,262
INVESTMENTS IN JOINT VENTURES	12,319	7,889
RECEIVABLES FROM AFFILIATES	14,907
INVESTMENTS IN SUBSIDIARIES	3,684	3,757
OTHER	7,981	7,135
TOTAL	899,162	1,027,731
LIABILITIES AND EQUITY
Accounts payable	109,019	121,282
Payables to affiliates		196,829
Accrued expenses	59,195	60,415
Billings in excess of contract revenues	6,296	4,639
Current portion of long term debt	1,416	859
Total current liabilities	175,926	384,024
NOTES PAYABLE	356	7,553
DEFERRED INCOME TAXES	(521)	172
PAYABLES TO AFFILIATES	67,685
OTHER	20,425	19,939
Total liabilities	263,871	411,688
EQUITY:
Total equity	635,291	616,043
TOTAL	899,162	1,027,731
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	605	663	2,873	$ 3,399
Accounts receivable—net	1,842	355
Receivables from affiliates		3,673
Contract revenues in excess of billings	2,877	4,236
Prepaid expenses and other current assets	339	431
Total current assets	5,663	9,358
PROPERTY AND EQUIPMENT—Net	17	24
RECEIVABLES FROM AFFILIATES	3,449
OTHER	3	3
TOTAL	9,132	9,385
LIABILITIES AND EQUITY
Accounts payable	558	1,389
Payables to affiliates		403
Accrued expenses	596	659
Billings in excess of contract revenues	155
Total current liabilities	1,309	2,451
PAYABLES TO AFFILIATES	924
Total liabilities	2,233	2,451
EQUITY:
Total equity	6,899	6,934
TOTAL	9,132	9,385
GLDD Corporation [Member]
ASSETS
Cash and cash equivalents	2	2	$ 3
Receivables from affiliates		55,805
Prepaid expenses and other current assets	15,797	14,617
Total current assets	15,799	70,424
RECEIVABLES FROM AFFILIATES	54,028
INVESTMENTS IN SUBSIDIARIES	638,506	619,220
OTHER	3,918	4,967
TOTAL	712,251	694,611
LIABILITIES AND EQUITY
Accounts payable	384	516
Payables to affiliates		15,068
Accrued expenses	4,187	8,967
Current portion of long term debt	6,953	5,000
Total current liabilities	11,524	29,551
7 3/8% SENIOR NOTES	274,902	274,880
REVOLVING CREDIT FACILITY	28,000
NOTES PAYABLE	51,752	41,944
DEFERRED INCOME TAXES	89,776	91,835
PAYABLES TO AFFILIATES	3,775
OTHER	439	438
Total liabilities	460,168	438,648
EQUITY:
Total equity	252,083	255,963
TOTAL	$ 712,251	$ 694,611

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 220,802	$ 202,198	$ 634,236	$ 561,289
Costs of contract revenues	(196,717)	(177,739)	(567,182)	(489,720)
Gross profit	24,085	24,459	67,054	71,569
General and administrative expenses	15,277	16,062	48,768	49,850
Impairment of goodwill			2,750
(Gain) loss on sale of assets—net	(884)	390	(887)	558
Operating income	9,692	8,007	16,423	21,161
Interest income (expense)—net	(7,293)	(4,702)	(18,490)	(14,730)
Equity in loss of joint ventures	(2,051)	(5,785)	(5,765)	(9,063)
Gain on bargain purchase acquisition				2,197
Other loss/expense	706	384	(353)	410
Income (loss) from continuing operations before income taxes	1,054	(2,096)	(8,185)	(25)
Income tax (provision) benefit	(742)	1,069	2,831	425
Income (loss) from continuing operations	312	(1,027)	(5,354)	400
Loss from discontinued operations, net of income taxes		(1,059)		(9,118)
Net income (loss)	312	(2,086)	(5,354)	(8,718)
Comprehensive income (loss)	(327)	(2,671)	(6,748)	(9,306)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(593)		(2,174)
Costs of contract revenues	593		2,174
Equity in earnings (loss) of subsidiaries	(8,146)	(3,370)	(9,669)	(15,863)
Income (loss) from continuing operations before income taxes	(8,146)	(3,370)	(9,669)	(15,863)
Income (loss) from continuing operations		(3,370)		(15,863)
Loss from discontinued operations, net of income taxes		1,059		10,461
Net income (loss)	(8,146)	(2,311)	(9,669)	(5,402)
Comprehensive income (loss)	(7,507)	(1,726)	(8,275)	(4,814)
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	216,993	198,934	624,498	540,199
Costs of contract revenues	(193,955)	(170,911)	(558,343)	(463,718)
Gross profit	23,038	28,023	66,155	76,481
General and administrative expenses	15,277	15,988	48,768	49,776
Impairment of goodwill			2,750
(Gain) loss on sale of assets—net	(884)	390	(887)	558
Operating income	8,645	11,645	15,524	26,147
Interest income (expense)—net	(90)	(60)	(349)	91
Equity in earnings (loss) of subsidiaries	2	54	6	(52)
Equity in loss of joint ventures	(2,051)	(5,785)	(5,765)	(9,063)
Gain on bargain purchase acquisition				2,197
Other loss/expense	706	384	(346)	403
Income (loss) from continuing operations before income taxes	7,212	6,238	9,070	19,723
Income tax (provision) benefit	7	697	7	1,307
Income (loss) from continuing operations		6,935		21,030
Loss from discontinued operations, net of income taxes		(1,059)		(9,118)
Net income (loss)	7,219	5,876	9,077	11,912
Comprehensive income (loss)	7,219	5,707	9,077	11,713
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	4,402	3,264	11,912	21,090
Costs of contract revenues	(3,355)	(6,828)	(11,013)	(26,002)
Gross profit	1,047	(3,564)	899	(4,912)
General and administrative expenses		1		1
Operating income	1,047	(3,565)	899	(4,913)
Interest income (expense)—net				(261)
Other loss/expense			(7)	7
Income (loss) from continuing operations before income taxes	1,047	(3,565)	892	(5,167)
Income tax (provision) benefit	(120)		(300)
Income (loss) from continuing operations		(3,565)		(5,167)
Loss from discontinued operations, net of income taxes				(1,343)
Net income (loss)	927	(3,565)	592	(6,510)
Comprehensive income (loss)	288	(3,981)	(802)	(6,899)
GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
General and administrative expenses		73		73
Operating income		(73)		(73)
Interest income (expense)—net	(7,203)	(4,642)	(18,141)	(14,560)
Equity in earnings (loss) of subsidiaries	8,144	3,316	9,663	15,915
Income (loss) from continuing operations before income taxes	941	(1,399)	(8,478)	1,282
Income tax (provision) benefit	(629)	372	3,124	(882)
Income (loss) from continuing operations		(1,027)		400
Loss from discontinued operations, net of income taxes		(1,059)		(9,118)
Net income (loss)	312	(2,086)	(5,354)	(8,718)
Comprehensive income (loss)	$ (327)	$ (2,671)	$ (6,748)	$ (9,306)

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	$ (3,897)	$ 15,291
Net cash flows used in operating activities of discontinued operations		(5,024)
Cash provided by (used in) operating activities	(3,897)	10,267
INVESTING ACTIVITIES:
Purchases of property and equipment	(53,394)	(66,433)
Proceeds from dispositions of property and equipment	1,167	1,614
Proceeds from vendor performance obligations		(3,100)
Payments for acquisitions of businesses		(2,048)
Net cash flows used in investing activities of continuing operations	(52,227)	(69,967)
Net cash flows provided by investing activities of discontinued operations		5,275
Cash used in investing activities	(52,227)	(64,692)
FINANCING ACTIVITIES:
Deferred financing fees	(29)	(845)
Repayments of long term note payable	(488)
Purchase of noncontrolling interest		(205)
Taxes paid on settlement of vested share awards	(265)	(501)
Repayments of term loan facility	(3,750)
Repayments of equipment debt	(853)	(121)
Proceeds from equipment debt	410
Exercise of options and purchases from employee stock plans	1,356	1,542
Excess income tax benefit from share-based compensation	(13)	45
Treasury stock	(1,107)
Borrowings under revolving loans	146,000	105,000
Repayments of revolving loans	(118,000)	(105,000)
Net cash provided by (used in) financing activities	23,261	(85)
Effect of foreign currency exchange rates on cash and cash equivalents	(105)	260
Net decrease in cash and cash equivalents	(32,968)	(54,250)
Cash and cash equivalents at beginning of period	42,389	75,338
Cash and cash equivalents at end of period	9,421	21,088
Eliminations [Member]
INVESTING ACTIVITIES:
Net change in accounts with affiliates	38,898	9,402
Net cash flows used in investing activities of continuing operations		9,402
Cash used in investing activities	38,898	9,402
FINANCING ACTIVITIES:
Net change in accounts with affiliates, in finance activities	(38,898)	(9,402)
Net cash provided by (used in) financing activities	(38,898)	(9,402)
Subsidiary Guarantors [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	15,013	24,488
Net cash flows used in operating activities of discontinued operations		(4,000)
Cash provided by (used in) operating activities		20,488
INVESTING ACTIVITIES:
Purchases of property and equipment	(53,394)	(66,433)
Proceeds from dispositions of property and equipment	1,167	1,614
Proceeds from vendor performance obligations		(3,100)
Payments for acquisitions of businesses		(2,048)
Net change in accounts with affiliates	(29,059)	(9,402)
Net cash flows used in investing activities of continuing operations		(79,369)
Net cash flows provided by investing activities of discontinued operations		5,275
Cash used in investing activities	(81,286)	(74,094)
FINANCING ACTIVITIES:
Repayments of equipment debt	(853)	(121)
Net change in accounts with affiliates, in finance activities	17,416
Capital contributions	16,800
Net cash provided by (used in) financing activities	33,363	(121)
Net decrease in cash and cash equivalents	(32,910)	(53,727)
Cash and cash equivalents at beginning of period	41,724	71,939
Cash and cash equivalents at end of period	8,814	18,212
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	(1,308)	(3,357)
Net cash flows used in operating activities of discontinued operations		(1,024)
Cash provided by (used in) operating activities		(4,381)
FINANCING ACTIVITIES:
Net change in accounts with affiliates, in finance activities	1,355	3,595
Net cash provided by (used in) financing activities	1,355	3,595
Effect of foreign currency exchange rates on cash and cash equivalents	(105)	260
Net decrease in cash and cash equivalents	(58)	(526)
Cash and cash equivalents at beginning of period	663	3,399
Cash and cash equivalents at end of period	605	2,873
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	(17,602)	(5,840)
Cash provided by (used in) operating activities		(5,840)
INVESTING ACTIVITIES:
Net change in accounts with affiliates	(9,839)
Cash used in investing activities	(9,839)
FINANCING ACTIVITIES:
Deferred financing fees	(29)	(845)
Repayments of long term note payable	(488)
Purchase of noncontrolling interest		(205)
Taxes paid on settlement of vested share awards	(265)	(501)
Repayments of term loan facility	(3,750)
Proceeds from equipment debt	410
Net change in accounts with affiliates, in finance activities	20,127	5,807
Capital contributions	(16,800)
Exercise of options and purchases from employee stock plans	1,356	1,542
Excess income tax benefit from share-based compensation	(13)	45
Treasury stock	(1,107)
Borrowings under revolving loans	146,000	105,000
Repayments of revolving loans	(118,000)	(105,000)
Net cash provided by (used in) financing activities	27,441	5,843
Net decrease in cash and cash equivalents		3
Cash and cash equivalents at beginning of period	2
Cash and cash equivalents at end of period	$ 2	$ 3