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Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Jun. 30, 2016	Jul. 29, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
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		60,747,587

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 21,236	$ 14,184
Accounts receivable—net	110,940	130,777
Contract revenues in excess of billings	74,915	81,195
Inventories	35,053	35,963
Prepaid expenses and other current assets	76,107	67,614
Total current assets	318,251	329,733
PROPERTY AND EQUIPMENT—Net	416,484	430,210
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	85,544	86,004
INVENTORIES—Noncurrent	46,867	41,646
INVESTMENTS IN JOINT VENTURES	5,293	3,761
OTHER	7,470	6,770
TOTAL	879,909	898,124
CURRENT LIABILITIES:
Accounts payable	97,088	118,846
Accrued expenses	62,179	72,277
Billings in excess of contract revenues	4,971	7,061
Revolving credit facility	45,000
Current portion of long term debt	10,469	7,506
Total current liabilities	219,707	205,690
7 3/8% SENIOR NOTES	272,498	271,998
REVOLVING CREDIT FACILITY	45,000	20,000
NOTES PAYABLE	47,821	53,792
DEFERRED INCOME TAXES	70,979	74,006
OTHER	19,669	20,465
Total liabilities	630,674	645,951
COMMITMENTS AND CONTINGENCIES (Note 9)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 61,026 and 60,709 shares issued; 60,748 and 60,431 shares outstanding at June 30, 2016 and December 31, 2015, respectively.	6	6
Treasury stock, at cost	(1,433)	(1,433)
Additional paid-in capital	285,506	283,247
Accumulated deficit	(33,418)	(27,664)
Accumulated other comprehensive loss	(1,426)	(1,983)
Total equity	249,235	252,173
TOTAL	$ 879,909	$ 898,124

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
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	61,026,000	60,709,000
Common stock, shares outstanding	60,748,000	60,431,000

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Contract revenues	$ 192,192	$ 238,877	$ 355,311	$ 413,434
Costs of contract revenues	167,936	206,590	311,065	370,465
Gross profit	24,256	32,287	44,246	42,969
General and administrative expenses	19,751	15,543	39,840	33,491
Impairment of goodwill		2,750		2,750
(Gain) loss on sale of assets—net	687	5	677	(3)
Operating income	3,818	13,989	3,729	6,731
Interest expense—net	(5,903)	(5,567)	(11,624)	(11,197)
Equity in earnings (loss) of joint ventures	128	(2,616)	13	(3,714)
Other expense	(518)	(618)	(1,281)	(1,059)
Income (loss) before income taxes	(2,475)	5,188	(9,163)	(9,239)
Income tax (provision) benefit	756	(2,464)	3,409	3,573
Net income (loss)	$ (1,719)	$ 2,724	$ (5,754)	$ (5,666)
Basic earnings (loss) per share	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)
Basic weighted average shares	60,711	60,473	60,609	60,369
Diluted earnings (loss) per share	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)
Diluted weighted average shares	60,711	60,924	60,609	60,369

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

3 Months Ended

6 Months Ended

Jun. 30, 2016

Jun. 30, 2015

Jun. 30, 2016

Jun. 30, 2015

Statement Of Income And Comprehensive Income [Abstract]

Net income (loss)

$ (1,719)

$ 2,724

$ (5,754)

$ (5,666)

Currency translation adjustment-net of tax

^[1]

148

557

(755)

Comprehensive income (loss)

$ (1,571)

$ 2,777

$ (5,197)

$ (6,421)

[1]	Net of income tax (provision) benefit of $(99) and $(35) for the three months ended June 30, 2016 and 2015, respectively and $(370) and $500 for the six months ended June 30, 2016 and 2015, respectively.

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ (99)	$ (35)	$ (370)	$ 500

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]
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	2,058			2,058
Share-based compensation, Shares		93
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	846			846
Exercise of options and purchases from employee stock plans, Shares		160
Excess income tax benefit from share-based compensation	(13)			(13)
Net loss	(5,666)				(5,666)
Other comprehensive income—net of tax	(755)					(755)
BALANCE - value at Jun. 30, 2015	252,168	$ 6		280,792	(27,141)	(1,489)
BALANCE - shares at Jun. 30, 2015		60,521
BALANCE - value at Dec. 31, 2015	252,173	$ 6	$ (1,433)	283,247	(27,664)	(1,983)
BALANCE - shares at Dec. 31, 2015		60,709	(278)
Share-based compensation, Value	2,006			2,006
Share-based compensation, Shares		102
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(162)			(162)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		71
Exercise of options and purchases from employee stock plans, Value	415			415
Exercise of options and purchases from employee stock plans, Shares		144
Net loss	(5,754)				(5,754)
Other comprehensive income—net of tax	557					557
BALANCE - value at Jun. 30, 2016	$ 249,235	$ 6	$ (1,433)	$ 285,506	$ (33,418)	$ (1,426)
BALANCE - shares at Jun. 30, 2016		61,026	(278)

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES:
Net loss	$ (5,754)	$ (5,666)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	28,820	33,025
Equity in (earnings) loss of joint ventures	(3,815)	4,939
Cash distributions from joint ventures	1,233
Deferred income taxes	(2,657)	(3,659)
(Gain) loss on sale of assets—net	677	(3)
Impairment of goodwill		2,750
Gain on adjustment of contingent consideration		(8,444)
Amortization of deferred financing fees	1,249	1,212
Unrealized net gain from mark-to-market valuations of derivatives	(5,605)	(2,629)
Unrealized foreign currency gain	(244)	(789)
Share-based compensation expense	2,006	2,058
Excess income tax benefit from share-based compensation		13
Changes in assets and liabilities:
Accounts receivable	19,553	5,644
Contract revenues in excess of billings	6,604	(34,625)
Inventories	(4,311)	(291)
Prepaid expenses and other current assets	(4,162)	1,418
Accounts payable and accrued expenses	(23,456)	1,126
Billings in excess of contract revenues	(2,108)	(750)
Other noncurrent assets and liabilities	(770)	(2,210)
Cash provided by (used in) operating activities	7,260	(6,881)
INVESTING ACTIVITIES:
Purchases of property and equipment	(32,150)	(36,830)
Proceeds from dispositions of property and equipment	10,318	115
Net cash flows used in investing activities	(21,832)	(36,715)
FINANCING ACTIVITIES:
Deferred financing fees		(29)
Repayments of long term note payable	(531)
Taxes paid on settlement of vested share awards	(162)	(265)
Repayments of term loan facility	(2,500)	(2,500)
Repayments of equipment debt	(708)	(506)
Proceeds from equipment debt		410
Exercise of options and purchases from employee stock plans	415	846
Excess income tax benefit from share-based compensation		(13)
Borrowings under revolving loans	91,500	79,000
Repayments of revolving loans	(66,500)	(61,000)
Net cash provided by financing activities	21,514	15,943
Effect of foreign currency exchange rates on cash and cash equivalents	110	(40)
Net increase (decrease) in cash and cash equivalents	7,052	(27,693)
Cash and cash equivalents at beginning of period	14,184	42,389
Cash and cash equivalents at end of period	21,236	14,696
Supplemental Cash Flow Information
Cash paid for interest	12,815	12,296
Cash paid (refunded) for income taxes	(331)	987
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 4,289	2,690
Property and equipment purchased on capital leases and equipment notes		1,825
Property and equipment purchased on notes payable		$ 15,569

Basis Of Presentation Policies

6 Months Ended

Jun. 30, 2016

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis Of Presentation

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, 2015. 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 June 30, 2016, and its results of operations for the three and six months ended June 30, 2016 and 2015 and cash flows for the six months ended June 30, 2016 and 2015 have been included.

The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel, supplies, short-term rentals 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.

The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. These costs have averaged approximately 21% 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: dredging, Terra Contracting Services, LLC (“Terra”) and Great Lakes Environmental & Infrastructure, LLC (“GLEI”), previously referred to as Magnus Pacific, LLC, which were aggregated into two reportable segments: dredging and environmental & infrastructure, previously referred to as environmental & remediation. As Terra and GLEI have similarity in economic margins, services, production processes, customer types, distribution methods and regulatory environment, they were aggregated into one reporting segment. There has been no change in the Company’s identification of operating segments and reportable segments. 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.

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 March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) (“ASU 2016-09”). ASU 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, and interim periods within those annual periods. The Company is currently evaluating the impact of ASU 2016-09 on its consolidated financial statements.

In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842). The Board issued this update to increase the transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. The Company is currently evaluating the impact of ASU 2016-02 on its financial statements.

In November 2015, the FASB issued Accounting Standard Update No. 2015-17 (“ASU 2015-17”), Income Taxes: Balance Sheet Classifications of Deferred Taxes (Topic 740) which simplifies the presentation of deferred income taxes by requiring that deferred tax liabilities and assets be classified as noncurrent in the balance sheet. The update is effective for public companies for fiscal years beginning after December 15, 2016, including interim periods within that reporting period. The guidance may be adopted prospectively or retrospectively and early adoption is permitted. As of December 31, 2015, the Company elected to early adopt this ASU 2015-17 on a prospective basis and therefore, prior years were not retrospectively adjusted.

In April 2015, the FASB 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 adopted this standard in the first quarter of 2016 on a retrospective basis. As a result, the Company presented $3,502 of unamortized debt issuance costs that had been included in other assets in the consolidated balance sheet as of December 31, 2015 as direct deductions from the carrying amounts of the related debt liabilities.

In May 2014, the FASB 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 its first quarter of fiscal 2018. Early adoption is permitted in fiscal 2017. The Company is currently evaluating the impact of ASU 2014-09 on its consolidated financial statements.

Earnings Per Share

6 Months Ended

Jun. 30, 2016

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 three months ended June 30, 2016, the dilutive effect of 651 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 six months ended June 30, 2016 and 2015, the dilutive effect of 523 thousand and 488 thousand stock options and restricted stock units, respectively, were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during these periods. For the three and six months ended June 30, 2016, 1,603 thousand and 1,694 thousand stock options and restricted stock units were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method, as such stock options and restricted stock units were determined to be anti-dilutive. Similarly, for the three months ended June 30, 2015, 1,019 thousand stock options and 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 are as follows:

	Three Months Ended					Six Months Ended
(shares in thousands)	June 30,					June 30,
	2016			2015		2016			2015

Net income (loss)	$	(1,719	)	$	2,724	$	(5,754	)	$	(5,666	)

Weighted-average common shares outstanding — basic		60,711			60,473		60,609			60,369
Effect of stock options and restricted stock units		—			451		—			—

Weighted-average common shares outstanding — diluted		60,711			60,924		60,609			60,369

Earnings (loss) per share — basic	$	(0.03	)	$	0.05	$	(0.10	)	$	(0.09	)
Earnings (loss) per share — diluted	$	(0.03	)	$	0.05	$	(0.10	)	$	(0.09	)

Accounts Receivable And Contracts In Progress

6 Months Ended

Jun. 30, 2016

Receivables [Abstract]

Accounts receivable and contracts in progress

Accounts receivable at June 30, 2016 and December 31, 2015 are as follows:

	June 30,			December 31,
	2016			2015
Completed contracts	$	23,742		$	37,111
Contracts in progress		74,240			70,787
Retainage		17,392			27,203
		115,374			135,101
Allowance for doubtful accounts		(454	)		(754	)

Total accounts receivable—net	$	114,920		$	134,347

Current portion of accounts receivable—net	$	110,940		$	130,777
Long-term accounts receivable and retainage		3,980			3,570
Total accounts receivable—net	$	114,920		$	134,347

The components of contracts in progress at June 30, 2016 and December 31, 2015 are as follows:

	June 30,			December 31,
	2016			2015
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	360,254		$	230,159
Amounts billed		(310,461	)		(176,283	)
Costs and earnings in excess of billings for contracts in progress		49,793			53,876
Costs and earnings in excess of billings for completed contracts		25,122			27,319
Total contract revenues in excess of billings	$	74,915		$	81,195

Billings in excess of costs and earnings:
Amounts billed	$	(285,086	)	$	(207,550	)
Costs and earnings for contracts in progress		280,115			200,489
Total billings in excess of contract revenues	$	(4,971	)	$	(7,061	)

The Company has $17,910 included in costs in excess of billings that are dependent upon the sale of environmental credits earned for a wetland mitigation project. The sale of these credits is subject to market factors that could cause the amount of expected revenue to be higher or lower than currently estimated. If the amount of proceeds received from the sale of the environmental credits is lower than our expectations, we could sustain a loss of part or all of the costs incurred related to this project. Additionally, the timing of realization may be impacted by the timing of a delay in the sale of these environmental credits, resulting in a longer period to recover our investment.

- Definition

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

+ References + Details

Accrued Expenses

6 Months Ended

Jun. 30, 2016

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses

Accrued expenses at June 30, 2016 and December 31, 2015 are as follows:

	June 30,		December 31,
	2016		2015

Insurance	$	16,858	$	16,291
Accumulated deficit in joint ventures		14,359		15,408
Interest		9,154		8,743
Payroll and employee benefits		9,076		13,317
Percentage of completion adjustment		1,769		2,837
Income and other taxes		1,519		3,726
Fuel hedge contracts		—		4,388
Other		9,444		7,567
Total accrued expenses	$	62,179	$	72,277

Long-term Debt

6 Months Ended

Jun. 30, 2016

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 $199,000, 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 June 30, 2016 of $135,813.

On June 24, 2016, the Company entered into the seventh amendment to the Credit Agreement which modified the Credit Agreement to allow for the sale of the vessel known as the Reem Island and provided for the collateral release to effect the sale. The reduction in the collateral pool resulted in a reduction in the size of the Credit Facility, from $210,000 to $199,000. In addition, the net cash proceeds of the sale of the Reem Island, $10,000, were applied to the revolving loans outstanding.

On June 30, 2016 the Company entered into the eighth amendment (the “Eighth Amendment”) to the Credit Agreement which increased the margin applicable to interest rates, letters of credit and commitment fees thereunder. Depending on the Company’s consolidated total leverage ratio (as defined in the Credit Agreement and further described below), borrowings under the revolving credit facility will bear interest at the option of the Company at either the LIBOR rate plus a margin between 1.50% and 3.50% or a base rate plus a margin between 0.50% and 2.50%.

In addition, the Eighth Amendment modifies the consolidated total leverage covenant contained in the Credit Agreement and adds a maximum capital expenditures covenant. The Company may not permit the consolidated total leverage ratio to be greater than (i) 5.00 to 1.00 for the fiscal quarter ending June 30, 2016, (ii) 4.75 to 1.00 for the fiscal quarter ending September 30, 2016 and (iii) 4.50 to 1.00 for any fiscal quarter ending thereafter. Further, the Company and its subsidiaries may not allow its aggregate capital expenditures to exceed (i) $105,000 for the fiscal year ending December 31, 2016 and (ii) $45,000 during any fiscal year thereafter.

Last, the Eighth Amendment requires the Company and its subsidiaries party to the Credit Agreement to pledge their respective inventory as security for the revolving credit facility.

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 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 June 30, 2016, the Company had $45,000 of borrowings on the revolver and $53,424 of letters of credit outstanding, resulting in $100,576 of availability under the Credit Agreement. At June 30, 2016, 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, as subsequently amended, (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 borrowed an aggregate principal amount of $47,360 in 2014 and an additional $2,640 in 2015. 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 representations, affirmative and negative covenants and events of default customary 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 June 30, 2016 of $48,926.

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 $2,418. The long term portion is $15,896 and is included in notes payable or other long term liabilities.

Impairment Of Goodwill

6 Months Ended

Jun. 30, 2016

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

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

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

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

Fair Value Measurements

6 Months Ended

Jun. 30, 2016

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 June 30, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,217	$	—	$	1,217	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	4,388	$	—	$	4,388	$	—

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 June 30, 2016, the Company was party to various swap arrangements to hedge the price of a portion of its diesel fuel purchase requirements for work in its backlog to be performed through May 2017. As of June 30, 2016, there were 11.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through May 2017. Under these swap agreements, the Company will pay fixed prices ranging from $1.02 to $1.71 per gallon.

At June 30, 2016 the fair value asset of the fuel hedge contracts was estimated to be $1,217 and is recorded in prepaid expenses and other current assets. At December 31, 2015, the fair value liability of the fuel hedge contracts was estimated to be $4,388 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 June 30, 2016 and December 31, 2015 is as follows:

		Fair Value at
		June 30,		December 31,
	Balance Sheet Location	2016		2015
Asset derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	1,217	$	—
Liability derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	—	$	4,388

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 December 31,	$	83,576

Accumulated other comprehensive income (loss)

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Cumulative translation adjustments—net of tax	$	148	$	53	$	557	$	(755	)

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 Term Loan Facility 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 June 30, 2016 (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 $263,313 at June 30, 2016, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets. It is impracticable to determine the fair value of outstanding letters of credit or performance, bid and payment bonds due to uncertainties as to the amount and timing of future obligations, if any.

- 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

6 Months Ended

Jun. 30, 2016

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 2016, the Company granted 716 thousand restricted stock units to certain employees pursuant to the plan. In addition, all non-employee directors on the Company’s board of directors are paid a portion of their board-related compensation in stock grants. Compensation cost charged to expense related to share-based compensation arrangements was $1,079 and $1,001 for the three months ended June 30, 2016 and 2015, respectively, and $2,006 and $2,058 for the six months ended June 30, 2016 and 2015, respectively.

- Definition

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

+ References + Details

Commitments And Contingencies

6 Months Ended

Jun. 30, 2016

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 & infrastructure projects. The Company has a bonding agreement with Zurich American Insurance Company (“Zurich”) under which the Company can obtain performance, bid and payment bonds (the “Zurich Bonding Agreement”). 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 June 30, 2016, the Company had outstanding performance bonds with a notional amount of approximately $1,067,719, of which $41,082 relates to projects from the Company’s historical demolition business. The revenue value remaining in backlog related to these projects totaled approximately $488,122.

In connection with the sale of our historical demolition business, the Company was obligated to keep in place the surety bonds on pending demolition projects for the period required under the respective contract for a project.

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

Legal proceedings and other contingencies

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

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

On 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. On or about February 5, 2016, the parties agreed to a tentative settlement in the amount of $275, without any admission of liability and subject to final documentation. On June 3, 2016, a Consent Judgment was entered as a final judgment in Massachusetts Superior Court to implement that settlement.

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.

Except as noted above, 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

6 Months Ended

Jun. 30, 2016

Equity Method Investments And Joint Ventures [Abstract]

Investments

10.

Investments

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 June 30, 2016 and December 31, 2015, the Company had net advances to TerraSea of $24,782 and $27,592, 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 $14,359 and $14,271 at June 30, 2016 and December 31, 2015, respectively, which is presented in accrued expenses. The Company has commenced the wind down 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. The joint venture partner and the Company are continuing discussions. If those discussions do not lead to a resolution satisfactory to both parties, the joint venture partner and the Company will go to binding arbitration as stipulated by the TerraSea operating agreement. To the extent that net advances are not fully recoverable, additional losses may result in future periods. The Company and its joint venture partner remained obligated to fund TerraSea through the completion of its remaining project. The remaining TerraSea project was substantially complete at June 30, 2016.

Business Dispositions

6 Months Ended

Jun. 30, 2016

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. 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.

Subsequent to the end of the quarter, the Company entered into a definitive agreement to sell the assets associated with certain services lines of the environmental & infrastructure segment’s business, excluding the assets supporting the remediation service line.

Segment Information

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Segment Information

12.

Segment information

The Company and its subsidiaries currently operate in two reportable segments: dredging and environmental & infrastructure, previously referred to as the environment & remediation segment. 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						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
Dredging
Contract revenues	$	153,661		$	190,046		$	298,674		$	344,174
Operating income		10,624			18,115			21,209			25,989

Environmental & infrastructure
Contract revenues	$	39,782		$	49,926		$	58,872		$	71,478
Operating loss		(6,806	)		(4,126	)		(17,480	)		(19,258	)

Intersegment revenues	$	(1,251	)	$	(1,095	)	$	(2,235	)	$	(2,218	)
Total
Contract revenues	$	192,192		$	238,877		$	355,311		$	413,434
Operating income		3,818			13,989			3,729			6,731

Foreign dredging revenue of $11,683 and $13,192 for the three and six months ended June 30, 2016, respectively, was attributable to work done in the Middle East. Foreign dredging revenue for the three and six months ended June 30, 2015 was $47,539 and $89,238, 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Subsidiary Guarantors

6 Months Ended

Jun. 30, 2016

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Subsidiary Guarantors

13.

Subsidiary guarantors

The Company’s long-term debt at June 30, 2016 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 June 30, 2016 and December 31, 2015;

(ii)

statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015; and

(iii)

statements of cash flows for the six months ended June 30, 2016 and 2015.

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF JUNE 30, 2016
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	20,303		$	931	$	2	$	—		$	21,236
Accounts receivable — net		110,844			96		—		—			110,940
Contract revenues in excess of billings		72,873			2,042		—		—			74,915
Inventories		35,053			—		—		—			35,053
Prepaid expenses and other current assets		75,644			265		198		—			76,107
Total current assets		314,717			3,334		200		—			318,251

PROPERTY AND EQUIPMENT—Net		416,476			8		—		—			416,484
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		85,544			—		—		—			85,544
INVENTORIES — Noncurrent		46,867			—		—		—			46,867
INVESTMENTS IN JOINT VENTURES		5,293			—		—		—			5,293
RECEIVABLES FROM AFFILIATES		10,321			6,524		82,176		(99,021	)		—
INVESTMENTS IN SUBSIDIARIES		3,539			—		627,171		(630,710	)		—
OTHER		6,787			1		682		—			7,470
TOTAL	$	889,544		$	9,867	$	710,229	$	(729,731	)	$	879,909

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	96,990		$	98	$	—	$	—		$	97,088
Accrued expenses		52,248			614		9,317		—			62,179
Revolving Credit Facility		—			—		45,000		—			45,000
Billings in excess of contract revenues		4,856			115		—		—			4,971
Current portion of long term debt		1,441			—		9,028		—			10,469
Total current liabilities		155,535			827		63,345		—			219,707

7 3/8% SENIOR NOTES		—			—		272,498		—			272,498
NOTES PAYABLE		256			—		47,565		—			47,821
DEFERRED INCOME TAXES		(783	)		—		71,762		—			70,979
PAYABLES TO AFFILIATES		88,088			5,268		5,665		(99,021	)		—
OTHER		19,510			—		159		—			19,669
Total liabilities		262,606			6,095		460,994		(99,021	)		630,674

TOTAL EQUITY		626,938			3,772		249,235		(630,710	)		249,235
TOTAL	$	889,544		$	9,867	$	710,229	$	(729,731	)	$	879,909

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

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	12,035		$	2,147	$	2	$	—		$	14,184
Accounts receivable — net		129,978			799		—		—			130,777
Contract revenues in excess of billings		79,477			1,718		—		—			81,195
Inventories		35,963			—		—		—			35,963
Prepaid expenses and other current assets		66,919			218		477		—			67,614
Total current assets		324,372			4,882		479		—			329,733

PROPERTY AND EQUIPMENT—Net		430,192			18		—		—			430,210
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		86,004			—		—		—			86,004
INVENTORIES — Noncurrent		41,646			—		—		—			41,646
INVESTMENTS IN JOINT VENTURES		3,761			—		—		—			3,761
RECEIVABLES FROM AFFILIATES		18,326			6,009		70,738		(95,073	)		—
INVESTMENTS IN SUBSIDIARIES		3,706			—		621,984		(625,690	)		—
OTHER		6,702			3		65		—			6,770
TOTAL	$	914,709		$	10,912	$	693,266	$	(720,763	)	$	898,124

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	118,619		$	227	$	—	$	—		$	118,846
Accrued expenses		62,861			509		8,907		—			72,277
Billings in excess of contract revenues		6,964			97		—		—			7,061
Current portion of long term debt		1,424			—		6,082		—			7,506
Total current liabilities		189,868			833		14,989		—			205,690

7 3/8% SENIOR NOTES		—			—		271,998		—			271,998
REVOLVING CREDIT FACILITY		—			—		20,000		—			20,000
NOTE PAYABLE		323			—		53,469		—			53,792
DEFERRED INCOME TAXES		(783	)		—		74,789		—			74,006
PAYABLES TO AFFILIATES		85,859			3,505		5,709		(95,073	)		—
OTHER		20,326			—		139		—			20,465
Total liabilities		295,593			4,338		441,093		(95,073	)		645,951

TOTAL EQUITY		619,116			6,574		252,173		(625,690	)		252,173
TOTAL	$	914,709		$	10,912	$	693,266	$	(720,763	)	$	898,124

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED JUNE 30, 2016
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	192,709		$	—		$	—		$	(517	)	$	192,192
Costs of contract revenues		(167,005	)		(1,448	)		—			517			(167,936	)
Gross profit		25,704			(1,448	)		—			—			24,256

OPERATING EXPENSES:
General and administrative expenses		19,806			—			(55	)		—			19,751
Loss on sale of assets—net		687			—			—			—			687
Operating income (loss)		5,211			(1,448	)		55			—			3,818

Interest expense—net		(184	)		—			(5,719	)		—			(5,903	)
Equity in earnings of subsidiaries		(96	)		—			3,190			(3,094	)		—
Equity in earnings of joint ventures		128			—			—			—			128
Other expense		(518	)		—			—			—			(518	)
Income (loss) before income taxes		4,541			(1,448	)		(2,474	)		(3,094	)		(2,475	)

Income tax benefit		1			—			755			—			756

Net income (loss)	$	4,542		$	(1,448	)	$	(1,719	)	$	(3,094	)	$	(1,719	)

Comprehensive income (loss)	$	4,542		$	(1,300	)	$	(1,571	)	$	(3,242	)	$	(1,571	)

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	235,151		$	4,318		$	—		$	(592	)	$	238,877
Costs of contract revenues		(203,184	)		(3,998	)		—			592			(206,590	)
Gross profit		31,967			320			—			—			32,287

OPERATING EXPENSES:
General and administrative expenses		15,543			—			—			—			15,543
Impairment of goodwill		2,750			—			—			—			2,750
Loss on sale of assets—net		5			—			—			—			5
Operating income		13,669			320			—			—			13,989

Interest expense—net		40			—			(5,607	)		—			(5,567	)
Equity in earnings of subsidiaries		—			—			10,696			(10,696	)		—
Equity in loss of joint ventures		(2,616	)		—			—			—			(2,616	)
Other expense		(618	)		—			—			—			(618	)
Income before income taxes		10,475			320			5,089			(10,696	)		5,188

Income tax provision		—			(99	)		(2,365	)		—			(2,464	)

Net income	$	10,475		$	221		$	2,724		$	(10,696	)	$	2,724

Comprehensive income	$	10,475		$	274		$	2,777		$	(10,749	)	$	2,777

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE SIX MONTHS ENDED JUNE 30, 2016
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	356,288		$	—		$	—		$	(977	)	$	355,311
Costs of contract revenues		(309,188	)		(2,854	)		—			977			(311,065	)
Gross profit		47,100			(2,854	)		—			—			44,246

OPERATING EXPENSES:
General and administrative expenses		39,891			4			(55	)		—			39,840
Loss on sale of assets—net		677			—			—			—			677
Operating income (loss)		6,532			(2,858	)		55			—			3,729

Interest expense—net		(365	)		—			(11,259	)		—			(11,624	)
Equity in earnings of subsidiaries		(178	)		—			2,041			(1,863	)		—
Equity in earnings of joint ventures		13			—			—			—			13
Other expense		(1,273	)		(8	)		—			—			(1,281	)
Income (loss) before income taxes		4,729			(2,866	)		(9,163	)		(1,863	)		(9,163	)

Income tax benefit		—			—			3,409			—			3,409

Net income (loss)	$	4,729		$	(2,866	)	$	(5,754	)	$	(1,863	)	$	(5,754	)

Comprehensive income (loss)	$	4,729		$	(2,309	)	$	(5,197	)	$	(2,420	)	$	(5,197	)

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	407,505		$	7,510		$	—		$	(1,581	)	$	413,434
Costs of contract revenues		(364,388	)		(7,658	)		—			1,581			(370,465	)
Gross profit		43,117			(148	)		—			—			42,969

OPERATING EXPENSES:
General and administrative expenses		33,491			—			—			—			33,491
Impairment of goodwill		2,750			—			—			—			2,750
Gain on sale of assets—net		(3	)		—			—			—			(3	)
Operating income (loss)		6,879			(148	)		—			—			6,731

Interest expense—net		(259	)		—			(10,938	)		—			(11,197	)
Equity in earnings of subsidiaries		4			—			1,519			(1,523	)		—
Equity in loss of joint ventures		(3,714	)		—			—			—			(3,714	)
Other income		(1,052	)		(7	)		—			—			(1,059	)
Income (loss) before income taxes		1,858			(155	)		(9,419	)		(1,523	)		(9,239	)

Income tax (provision) benefit		—			(180	)		3,753			—			3,573

Net income (loss)	$	1,858		$	(335	)	$	(5,666	)	$	(1,523	)	$	(5,666	)

Comprehensive income (loss)	$	1,858		$	(1,090	)	$	(6,421	)	$	(768	)	$	(6,421	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2016
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	$	19,388		$	(2,210	)	$	(9,918	)	$	—		$	7,260

INVESTING ACTIVITIES:
Purchases of property and equipment		(32,150	)		—			—			—			(32,150	)
Proceeds from dispositions of property and equipment		10,318			—			—			—			10,318
Net change in accounts with affiliates		13,734			—			—			(13,734	)		—
Net cash flows used in investing activities		(8,098	)		—			—			(13,734	)		(21,832	)

FINANCING ACTIVITIES:
Repayments of long term note payable		—			—			(531	)		—			(531	)
Repayments of term loan facility		—			—			(2,500	)		—			(2,500	)
Repayments of equipment debt		(708	)		—			—			—			(708	)
Net change in accounts with affiliates		20,686			884			(35,304	)		13,734			—
Intercompany dividends		(23,000	)		—			23,000			—			—
Exercise of options and purchases from employee stock plans		—			—			415			—			415
Taxes paid on settlement of vested share awards		—			—			(162	)		—			(162	)
Borrowings under revolving loans		—			—			91,500			—			91,500
Repayments of revolving loans		—			—			(66,500	)		—			(66,500	)

Net cash flows provided by (used in) financing activities		(3,022	)		884			9,918			13,734			21,514

Effect of foreign currency exchange rates on cash and cash equivalents		—			110			—			—			110

Net increase (decrease) in cash and cash equivalents		8,268			(1,216	)		—			—			7,052

Cash and cash equivalents at beginning of period		12,035			2,147			2			—			14,184

Cash and cash equivalents at end of period	$	20,303		$	931		$	2		$	—		$	21,236

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	4,427		$	(322	)	$	(10,986	)	$	—		$	(6,881	)

INVESTING ACTIVITIES:
Purchases of property and equipment		(36,830	)		—			—			—			(36,830	)
Proceeds from dispositions of property and equipment		115			—			—			—			115
Net change in accounts with affiliates		(12,571	)		—			—			12,571			—
Net cash flows used in investing activities		(49,286	)		—			—			12,571			(36,715	)

FINANCING ACTIVITIES:
Deferred financing fees		—			—			(29	)		—			(29	)
Taxes paid on settlement of vested share awards		—			—			(265	)		—			(265	)
Repayments of term loan facility		—			—			(2,500	)		—			(2,500	)
Repayment of equipment debt		(506	)		—			—			—			(506	)
Proceeds from equipment debt		2			—			408			—			410
Net change in accounts with affiliates		—			1,232			11,339			(12,571	)		—
Capital contributions		16,800			—			(16,800	)		—			—
Exercise of options and purchases from employee stock plans		—			—			846			—			846
Excess income tax benefit from share-based compensation		—			—			(13	)		—			(13	)
Borrowings under revolving loans		—			—			79,000			—			79,000
Repayments of revolving loans		—			—			(61,000	)		—			(61,000	)

Net cash flows provided by financing activities		16,296			1,232			10,986			(12,571	)		15,943

Effect of foreign currency exchange rates on cash and cash equivalents		—			(40	)		—			—			(40	)

Net increase (decrease) in cash and cash equivalents		(28,563	)		870			—			—			(27,693	)

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

Cash and cash equivalents at end of period	$	13,161		$	1,533		$	2		$	—		$	14,696

- Definition

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

+ References + Details

Basis Of Presentation Policies (Policies)	6 Months Ended
Basis Of Presentation Policies (Policies)	Jun. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) (“ASU 2016-09”). ASU 2016-09 identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, and interim periods within those annual periods. The Company is currently evaluating the impact of ASU 2016-09 on its consolidated financial statements. In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842). The Board issued this update to increase the transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. The Company is currently evaluating the impact of ASU 2016-02 on its financial statements. In November 2015, the FASB issued Accounting Standard Update No. 2015-17 (“ASU 2015-17”), Income Taxes: Balance Sheet Classifications of Deferred Taxes (Topic 740) which simplifies the presentation of deferred income taxes by requiring that deferred tax liabilities and assets be classified as noncurrent in the balance sheet. The update is effective for public companies for fiscal years beginning after December 15, 2016, including interim periods within that reporting period. The guidance may be adopted prospectively or retrospectively and early adoption is permitted. As of December 31, 2015, the Company elected to early adopt this ASU 2015-17 on a prospective basis and therefore, prior years were not retrospectively adjusted. In April 2015, the FASB 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 adopted this standard in the first quarter of 2016 on a retrospective basis. As a result, the Company presented $3,502 of unamortized debt issuance costs that had been included in other assets in the consolidated balance sheet as of December 31, 2015 as direct deductions from the carrying amounts of the related debt liabilities. In May 2014, the FASB 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 its first quarter of fiscal 2018. Early adoption is permitted in fiscal 2017. The Company is currently evaluating the impact of ASU 2014-09 on its consolidated financial statements.

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Computations For Basic And Diluted Earnings Per Share

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

	Three Months Ended					Six Months Ended
(shares in thousands)	June 30,					June 30,
	2016			2015		2016			2015

Net income (loss)	$	(1,719	)	$	2,724	$	(5,754	)	$	(5,666	)

Weighted-average common shares outstanding — basic		60,711			60,473		60,609			60,369
Effect of stock options and restricted stock units		—			451		—			—

Weighted-average common shares outstanding — diluted		60,711			60,924		60,609			60,369

Earnings (loss) per share — basic	$	(0.03	)	$	0.05	$	(0.10	)	$	(0.09	)
Earnings (loss) per share — diluted	$	(0.03	)	$	0.05	$	(0.10	)	$	(0.09	)

Accounts Receivable And Contracts In Progress (Tables)

6 Months Ended

Jun. 30, 2016

Receivables [Abstract]

Schedule Of Accounts Receivable

Accounts receivable at June 30, 2016 and December 31, 2015 are as follows:

	June 30,			December 31,
	2016			2015
Completed contracts	$	23,742		$	37,111
Contracts in progress		74,240			70,787
Retainage		17,392			27,203
		115,374			135,101
Allowance for doubtful accounts		(454	)		(754	)

Total accounts receivable—net	$	114,920		$	134,347

Current portion of accounts receivable—net	$	110,940		$	130,777
Long-term accounts receivable and retainage		3,980			3,570
Total accounts receivable—net	$	114,920		$	134,347

Components Of Contracts In Progress

The components of contracts in progress at June 30, 2016 and December 31, 2015 are as follows:

	June 30,			December 31,
	2016			2015
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	360,254		$	230,159
Amounts billed		(310,461	)		(176,283	)
Costs and earnings in excess of billings for contracts in progress		49,793			53,876
Costs and earnings in excess of billings for completed contracts		25,122			27,319
Total contract revenues in excess of billings	$	74,915		$	81,195

Billings in excess of costs and earnings:
Amounts billed	$	(285,086	)	$	(207,550	)
Costs and earnings for contracts in progress		280,115			200,489
Total billings in excess of contract revenues	$	(4,971	)	$	(7,061	)

Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2016

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses at June 30, 2016 and December 31, 2015 are as follows:

	June 30,		December 31,
	2016		2015

Insurance	$	16,858	$	16,291
Accumulated deficit in joint ventures		14,359		15,408
Interest		9,154		8,743
Payroll and employee benefits		9,076		13,317
Percentage of completion adjustment		1,769		2,837
Income and other taxes		1,519		3,726
Fuel hedge contracts		—		4,388
Other		9,444		7,567
Total accrued expenses	$	62,179	$	72,277

Impairment Of Goodwill (Tables)

6 Months Ended

Jun. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

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

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

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

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

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

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 June 30, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,217	$	—	$	1,217	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	4,388	$	—	$	4,388	$	—

Schedule Fair Value Measurements Balance Sheet Location

The fair value of the fuel hedge contracts outstanding as of June 30, 2016 and December 31, 2015 is as follows:

		Fair Value at
		June 30,		December 31,
	Balance Sheet Location	2016		2015
Asset derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	1,217	$	—
Liability derivatives:
Derivatives not designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	—	$	4,388

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. 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 December 31,	$	83,576

Changes In Components Of Accumulated Other Comprehensive Income (Loss)

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Cumulative translation adjustments—net of tax	$	148	$	53	$	557	$	(755	)

Segment Information (Tables)

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Segment Reporting By Segment

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
Dredging
Contract revenues	$	153,661		$	190,046		$	298,674		$	344,174
Operating income		10,624			18,115			21,209			25,989

Environmental & infrastructure
Contract revenues	$	39,782		$	49,926		$	58,872		$	71,478
Operating loss		(6,806	)		(4,126	)		(17,480	)		(19,258	)

Intersegment revenues	$	(1,251	)	$	(1,095	)	$	(2,235	)	$	(2,218	)
Total
Contract revenues	$	192,192		$	238,877		$	355,311		$	413,434
Operating income		3,818			13,989			3,729			6,731

Subsidiary Guarantors (Tables)

6 Months Ended

Jun. 30, 2016

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 JUNE 30, 2016
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	20,303		$	931	$	2	$	—		$	21,236
Accounts receivable — net		110,844			96		—		—			110,940
Contract revenues in excess of billings		72,873			2,042		—		—			74,915
Inventories		35,053			—		—		—			35,053
Prepaid expenses and other current assets		75,644			265		198		—			76,107
Total current assets		314,717			3,334		200		—			318,251

PROPERTY AND EQUIPMENT—Net		416,476			8		—		—			416,484
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		85,544			—		—		—			85,544
INVENTORIES — Noncurrent		46,867			—		—		—			46,867
INVESTMENTS IN JOINT VENTURES		5,293			—		—		—			5,293
RECEIVABLES FROM AFFILIATES		10,321			6,524		82,176		(99,021	)		—
INVESTMENTS IN SUBSIDIARIES		3,539			—		627,171		(630,710	)		—
OTHER		6,787			1		682		—			7,470
TOTAL	$	889,544		$	9,867	$	710,229	$	(729,731	)	$	879,909

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	96,990		$	98	$	—	$	—		$	97,088
Accrued expenses		52,248			614		9,317		—			62,179
Revolving Credit Facility		—			—		45,000		—			45,000
Billings in excess of contract revenues		4,856			115		—		—			4,971
Current portion of long term debt		1,441			—		9,028		—			10,469
Total current liabilities		155,535			827		63,345		—			219,707

7 3/8% SENIOR NOTES		—			—		272,498		—			272,498
NOTES PAYABLE		256			—		47,565		—			47,821
DEFERRED INCOME TAXES		(783	)		—		71,762		—			70,979
PAYABLES TO AFFILIATES		88,088			5,268		5,665		(99,021	)		—
OTHER		19,510			—		159		—			19,669
Total liabilities		262,606			6,095		460,994		(99,021	)		630,674

TOTAL EQUITY		626,938			3,772		249,235		(630,710	)		249,235
TOTAL	$	889,544		$	9,867	$	710,229	$	(729,731	)	$	879,909

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

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	12,035		$	2,147	$	2	$	—		$	14,184
Accounts receivable — net		129,978			799		—		—			130,777
Contract revenues in excess of billings		79,477			1,718		—		—			81,195
Inventories		35,963			—		—		—			35,963
Prepaid expenses and other current assets		66,919			218		477		—			67,614
Total current assets		324,372			4,882		479		—			329,733

PROPERTY AND EQUIPMENT—Net		430,192			18		—		—			430,210
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		86,004			—		—		—			86,004
INVENTORIES — Noncurrent		41,646			—		—		—			41,646
INVESTMENTS IN JOINT VENTURES		3,761			—		—		—			3,761
RECEIVABLES FROM AFFILIATES		18,326			6,009		70,738		(95,073	)		—
INVESTMENTS IN SUBSIDIARIES		3,706			—		621,984		(625,690	)		—
OTHER		6,702			3		65		—			6,770
TOTAL	$	914,709		$	10,912	$	693,266	$	(720,763	)	$	898,124

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	118,619		$	227	$	—	$	—		$	118,846
Accrued expenses		62,861			509		8,907		—			72,277
Billings in excess of contract revenues		6,964			97		—		—			7,061
Current portion of long term debt		1,424			—		6,082		—			7,506
Total current liabilities		189,868			833		14,989		—			205,690

7 3/8% SENIOR NOTES		—			—		271,998		—			271,998
REVOLVING CREDIT FACILITY		—			—		20,000		—			20,000
NOTE PAYABLE		323			—		53,469		—			53,792
DEFERRED INCOME TAXES		(783	)		—		74,789		—			74,006
PAYABLES TO AFFILIATES		85,859			3,505		5,709		(95,073	)		—
OTHER		20,326			—		139		—			20,465
Total liabilities		295,593			4,338		441,093		(95,073	)		645,951

TOTAL EQUITY		619,116			6,574		252,173		(625,690	)		252,173
TOTAL	$	914,709		$	10,912	$	693,266	$	(720,763	)	$	898,124

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 SIX MONTHS ENDED JUNE 30, 2016
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	356,288		$	—		$	—		$	(977	)	$	355,311
Costs of contract revenues		(309,188	)		(2,854	)		—			977			(311,065	)
Gross profit		47,100			(2,854	)		—			—			44,246

OPERATING EXPENSES:
General and administrative expenses		39,891			4			(55	)		—			39,840
Loss on sale of assets—net		677			—			—			—			677
Operating income (loss)		6,532			(2,858	)		55			—			3,729

Interest expense—net		(365	)		—			(11,259	)		—			(11,624	)
Equity in earnings of subsidiaries		(178	)		—			2,041			(1,863	)		—
Equity in earnings of joint ventures		13			—			—			—			13
Other expense		(1,273	)		(8	)		—			—			(1,281	)
Income (loss) before income taxes		4,729			(2,866	)		(9,163	)		(1,863	)		(9,163	)

Income tax benefit		—			—			3,409			—			3,409

Net income (loss)	$	4,729		$	(2,866	)	$	(5,754	)	$	(1,863	)	$	(5,754	)

Comprehensive income (loss)	$	4,729		$	(2,309	)	$	(5,197	)	$	(2,420	)	$	(5,197	)

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	407,505		$	7,510		$	—		$	(1,581	)	$	413,434
Costs of contract revenues		(364,388	)		(7,658	)		—			1,581			(370,465	)
Gross profit		43,117			(148	)		—			—			42,969

OPERATING EXPENSES:
General and administrative expenses		33,491			—			—			—			33,491
Impairment of goodwill		2,750			—			—			—			2,750
Gain on sale of assets—net		(3	)		—			—			—			(3	)
Operating income (loss)		6,879			(148	)		—			—			6,731

Interest expense—net		(259	)		—			(10,938	)		—			(11,197	)
Equity in earnings of subsidiaries		4			—			1,519			(1,523	)		—
Equity in loss of joint ventures		(3,714	)		—			—			—			(3,714	)
Other income		(1,052	)		(7	)		—			—			(1,059	)
Income (loss) before income taxes		1,858			(155	)		(9,419	)		(1,523	)		(9,239	)

Income tax (provision) benefit		—			(180	)		3,753			—			3,573

Net income (loss)	$	1,858		$	(335	)	$	(5,666	)	$	(1,523	)	$	(5,666	)

Comprehensive income (loss)	$	1,858		$	(1,090	)	$	(6,421	)	$	(768	)	$	(6,421	)

Condensed Cash Flow Statement

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2016
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	$	19,388		$	(2,210	)	$	(9,918	)	$	—		$	7,260

INVESTING ACTIVITIES:
Purchases of property and equipment		(32,150	)		—			—			—			(32,150	)
Proceeds from dispositions of property and equipment		10,318			—			—			—			10,318
Net change in accounts with affiliates		13,734			—			—			(13,734	)		—
Net cash flows used in investing activities		(8,098	)		—			—			(13,734	)		(21,832	)

FINANCING ACTIVITIES:
Repayments of long term note payable		—			—			(531	)		—			(531	)
Repayments of term loan facility		—			—			(2,500	)		—			(2,500	)
Repayments of equipment debt		(708	)		—			—			—			(708	)
Net change in accounts with affiliates		20,686			884			(35,304	)		13,734			—
Intercompany dividends		(23,000	)		—			23,000			—			—
Exercise of options and purchases from employee stock plans		—			—			415			—			415
Taxes paid on settlement of vested share awards		—			—			(162	)		—			(162	)
Borrowings under revolving loans		—			—			91,500			—			91,500
Repayments of revolving loans		—			—			(66,500	)		—			(66,500	)

Net cash flows provided by (used in) financing activities		(3,022	)		884			9,918			13,734			21,514

Effect of foreign currency exchange rates on cash and cash equivalents		—			110			—			—			110

Net increase (decrease) in cash and cash equivalents		8,268			(1,216	)		—			—			7,052

Cash and cash equivalents at beginning of period		12,035			2,147			2			—			14,184

Cash and cash equivalents at end of period	$	20,303		$	931		$	2		$	—		$	21,236

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	4,427		$	(322	)	$	(10,986	)	$	—		$	(6,881	)

INVESTING ACTIVITIES:
Purchases of property and equipment		(36,830	)		—			—			—			(36,830	)
Proceeds from dispositions of property and equipment		115			—			—			—			115
Net change in accounts with affiliates		(12,571	)		—			—			12,571			—
Net cash flows used in investing activities		(49,286	)		—			—			12,571			(36,715	)

FINANCING ACTIVITIES:
Deferred financing fees		—			—			(29	)		—			(29	)
Taxes paid on settlement of vested share awards		—			—			(265	)		—			(265	)
Repayments of term loan facility		—			—			(2,500	)		—			(2,500	)
Repayment of equipment debt		(506	)		—			—			—			(506	)
Proceeds from equipment debt		2			—			408			—			410
Net change in accounts with affiliates		—			1,232			11,339			(12,571	)		—
Capital contributions		16,800			—			(16,800	)		—			—
Exercise of options and purchases from employee stock plans		—			—			846			—			846
Excess income tax benefit from share-based compensation		—			—			(13	)		—			(13	)
Borrowings under revolving loans		—			—			79,000			—			79,000
Repayments of revolving loans		—			—			(61,000	)		—			(61,000	)

Net cash flows provided by financing activities		16,296			1,232			10,986			(12,571	)		15,943

Effect of foreign currency exchange rates on cash and cash equivalents		—			(40	)		—			—			(40	)

Net increase (decrease) in cash and cash equivalents		(28,563	)		870			—			—			(27,693	)

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

Cash and cash equivalents at end of period	$	13,161		$	1,533		$	2		$	—		$	14,696

Basis Of Presentation (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
Basis Of Presentation (Narrative) (Details) $ in Thousands	Jun. 30, 2015 USD ($)	Jun. 30, 2016 segment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Average equipment-related costs of total costs of contract revenue		21.00%
Number of operating Segments \| segment		3
Number of reportable segments \| segment		2
Impairment of goodwill \| $	$ 2,750		$ 2,750
Unamortized debt issuance costs \| $				$ 3,502
Terra and GLEI [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments \| segment		1
Terra Contracting Services [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Impairment of goodwill \| $	$ 2,750

Earnings Per Share (Narrative) (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	1,603	1,019	1,694
Securities excluded from computation of earnings per share amount due to loss	651		523	488

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ (1,719)	$ 2,724	$ (5,754)	$ (5,666)
Weighted-average common shares outstanding — basic	60,711	60,473	60,609	60,369
Effect of stock options and restricted stock units		451
Weighted-average common shares outstanding — diluted	60,711	60,924	60,609	60,369
Earnings (loss) per share — basic	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)
Earnings (loss) per share — diluted	$ (0.03)	$ 0.05	$ (0.10)	$ (0.09)

- Definition

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

+ References + Details

- Definition

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

+ References + Details

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Retainage	$ 17,392	$ 27,203
Accounts receivable, gross	115,374	135,101
Allowance for doubtful accounts	(454)	(754)
Total accounts receivable—net	114,920	134,347
Current portion of accounts receivable—net	110,940	130,777
Long-term accounts receivable and retainage	3,980	3,570
Completed Contracts [Member]
Accounts Notes And Loans Receivable [Line Items]
contracts	23,742	37,111
Contracts In Progress [Member]
Accounts Notes And Loans Receivable [Line Items]
contracts	$ 74,240	$ 70,787

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 49,793	$ 53,876
Costs and earnings in excess of billings for completed contracts	25,122	27,319
Total contract revenues in excess of billings	74,915	81,195
Total billings in excess of contract revenues	(4,971)	(7,061)
Costs And Earnings In Excess Of Billings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	360,254	230,159
Amounts billed	(310,461)	(176,283)
Billings In Excess Of Costs And Earnings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	280,115	200,489
Amounts billed	$ (285,086)	$ (207,550)

Accounts Receivable And Contracts In Progress (Narrative) (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Receivables [Abstract]
Costs in excess of billings	$ 17,910

Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Insurance	$ 16,858	$ 16,291
Accumulated deficit in joint ventures	14,359	15,408
Interest	9,154	8,743
Payroll and employee benefits	9,076	13,317
Percentage of completion adjustment	1,769	2,837
Income and other taxes	1,519	3,726
Fuel hedge contracts		4,388
Other	9,444	7,567
Total accrued expenses	$ 62,179	$ 72,277

Long-Term Debt (Narrative) (Details) - USD ($)		3 Months Ended	6 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Jun. 24, 2016	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Nov. 04, 2014	Jun. 04, 2012
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 199,000,000							$ 210,000,000
Net book value of related assets			$ 135,813,000
Fixed Charge Coverage Ratio			1.25%
Revolving credit facility			$ 45,000,000		$ 20,000,000
Letters of credit outstanding			53,424,000
Letter of credit remaining borrowing capacity			100,576,000
Borrowed aggregate principal amount					2,640,000	$ 47,360,000
Purchases of property and equipment			32,150,000	$ 36,830,000
Long-term Debt, Current Maturities			10,469,000		$ 7,506,000
7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 275,000,000
Debt Instrument, Interest Rate, Stated Percentage			7.375%
Maturity date			Feb. 01, 2019
If Redeemed In 2015 [Member] \| 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			103.70%
If Redeemed In 2016 [Member] \| 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			101.80%
If Redeemed After 2016 [Member] \| 7.375% Senior Notes Due In 2019 [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			$ 48,926,000
Debt instrument, face amount							$ 50,000,000
Debt Instrument, Term			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		2,418,000
Long-term Debt, Excluding Current Maturities		$ 15,896,000
Vessels and Ancillary Equipment [Member] \| 5.75% Senior Notes Due In 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.75%
Maximum [Member]
Debt Instrument [Line Items]
Total leverage ratio for fiscal quarter ending June 30, 2016			5.00%
Total leverage ratio for fiscal quarter ending September 30, 2016			4.75%
Total leverage ratio for any fiscal quarter ending thereafter			4.50%
Aggregate capital expenditures for fiscal year ending December 30, 2016			$ 105,000,000
Aggregate capital expenditures during any fiscal year thereafter			$ 45,000,000
Maximum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			3.50%
Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.50%
Minimum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								199,000,000
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 March 31, 2016 of $148,785. 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.
Repayments of Lines of Credit	$ 10,000,000
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	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015
Goodwill [Line Items]
Impairment of goodwill	$ 2,750	$ 2,750
Terra Contracting Services [Member]
Goodwill [Line Items]
Impairment of goodwill	$ 2,750

Impairment Of Goodwill (Change In The Carrying Amount Of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 86,326
Impairment of goodwill	$ (2,750)	(2,750)
Goodwill, Ending Balance	83,576	83,576
Dredging Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		76,576
Goodwill, Ending Balance	76,576	76,576
Environmental & Remediation Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		9,750
Impairment of goodwill		(2,750)
Goodwill, Ending Balance	$ 7,000	$ 7,000

Fair Value Measurements (Fair Value Measurements At Reporting Date Using) (Details) - Fuel Hedge Contracts [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,217	$ 4,388
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,217	$ 4,388

Fair Value Measurements (Narrative) (Details) gal in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) $ / gal gal	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivatives Fair Value [Line Items]
Derivative underlying hedge percent		80.00%
Derivative, Nonmonetary Notional Amount, Volume \| gal		11.0
Fair value hedge assets		$ 1,217,000
Fair value hedge liabilities				$ 4,388,000
Impairment of goodwill	$ 2,750,000		$ 2,750,000
7.375% Senior Notes Due In 2019 [Member]
Derivatives Fair Value [Line Items]
Debt instrument, face amount		$ 275,000,000
Stated interest rate		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		$ 263,313,000
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		1.02
Maximum [Member]
Derivatives Fair Value [Line Items]
Fixed price range \| $ / gal		1.71

Fair Value Measurements (Schedule of Balance Sheet Location Fuel Hedge Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Fair value hedge assets	$ 1,217
Fair value hedge liabilities		$ 4,388
Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member] \| Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Fair value hedge assets	$ 1,217
Designated as Hedging Instrument [Member] \| Accrued Liabilities [Member] \| Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Fair value hedge liabilities		$ 4,388

Fair Value Measurements (Fair Value Measurements Using Significant Unobservable) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2015
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Impairment of goodwill	$ (2,750)	$ (2,750)
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 86,326	$ 86,326
Impairment of goodwill			(2,750)
Ending balance			$ 83,576

Fair Value Measurements (Changes In Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2016

Jun. 30, 2015

Jun. 30, 2016

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Cumulative translation adjustments—net of tax

^[1]

$ 148

$ 53

$ 557

$ (755)

[1]	Net of income tax (provision) benefit of $(99) and $(35) for the three months ended June 30, 2016 and 2015, respectively and $(370) and $500 for the six months ended June 30, 2016 and 2015, respectively.

Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units	716
Share-based compensation expense		$ 1,079	$ 1,001	$ 2,006	$ 2,058
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 (Narrative) (Details) - USD ($)			6 Months Ended
	Feb. 05, 2016	Jan. 14, 2015	Jun. 30, 2016
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 1,067,719,000
Revenue value remaining from outstanding performance bonds			488,122,000
Tentative settlement subject to final documentation	$ 275,000
Proceeds from Legal Settlements		$ 5,309,000
Discontinued Operations [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds			41,082,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 1,000,000
Warranty periods			1 year
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 10,000,000
Warranty periods			3 years

Investments (Details) - USD ($) $ in Thousands	6 Months Ended
Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
Accumulated deficit in joint ventures		$ 14,359	$ 15,408
TerraSea Environmental Solutions [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage		50.00%
Other current assets		$ 24,782	27,592
Accumulated deficit in joint ventures		$ 14,359	$ 14,271
Provision for losses to be assumed	$ 1,506

Business Dispositions (Narrative) (Details) $ in Thousands	Apr. 23, 2014 USD ($)
NASDI and Yankee
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses	$ 5,309

Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Narrative) (Details) $ in Thousands	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			2
Contract revenues	$ 192,192	$ 238,877	$ 355,311	$ 413,434
Dredging Segment [Member] \| Foreign [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 11,683	$ 47,539	$ 13,192	$ 89,238

Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Contract revenues	$ 192,192	$ 238,877	$ 355,311	$ 413,434
Operating income (loss)	3,818	13,989	3,729	6,731
Dredging Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	10,624	18,115	21,209	25,989
Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(6,806)	(4,126)	(17,480)	(19,258)
Operating Segment [Member] \| Dredging Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	153,661	190,046	298,674	344,174
Operating Segment [Member] \| Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	39,782	49,926	58,872	71,478
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ (1,251)	$ (1,095)	$ (2,235)	$ (2,218)

Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
7 3/8% SENIOR NOTES	$ 272,498	$ 271,998
Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
7 3/8% SENIOR NOTES	$ 275,000
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Owned Domestic Subsidiaries Percent	100.00%

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 21,236	$ 14,184	$ 14,696	$ 42,389
Accounts receivable—net	110,940	130,777
Contract revenues in excess of billings	74,915	81,195
Inventories	35,053	35,963
Prepaid expenses and other current assets	76,107	67,614
Total current assets	318,251	329,733
PROPERTY AND EQUIPMENT—Net	416,484	430,210
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	85,544	86,004
INVENTORIES—Noncurrent	46,867	41,646
INVESTMENTS IN JOINT VENTURES	5,293	3,761
OTHER	7,470	6,770
TOTAL	879,909	898,124
LIABILITIES AND EQUITY
Accounts payable	97,088	118,846
Accrued expenses	62,179	72,277
Revolving credit facility	45,000
Billings in excess of contract revenues	4,971	7,061
Current portion of long term debt	10,469	7,506
Total current liabilities	219,707	205,690
7 3/8% SENIOR NOTES	272,498	271,998
NOTES PAYABLE	47,821	53,792
DEFERRED INCOME TAXES	70,979	74,006
OTHER	19,669	20,465
Total liabilities	630,674	645,951
TOTAL EQUITY	249,235	252,173	252,168	255,963
TOTAL	879,909	898,124
REVOLVING CREDIT FACILITY	45,000	20,000
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	20,303	12,035	13,161	41,724
Accounts receivable—net	110,844	129,978
Contract revenues in excess of billings	72,873	79,477
Inventories	35,053	35,963
Prepaid expenses and other current assets	75,644	66,919
Total current assets	314,717	324,372
PROPERTY AND EQUIPMENT—Net	416,476	430,192
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	85,544	86,004
INVENTORIES—Noncurrent	46,867	41,646
INVESTMENTS IN JOINT VENTURES	5,293	3,761
RECEIVABLES FROM AFFILIATES	10,321	18,326
INVESTMENTS IN SUBSIDIARIES	3,539	3,706
OTHER	6,787	6,702
TOTAL	889,544	914,709
LIABILITIES AND EQUITY
Accounts payable	96,990	118,619
Accrued expenses	52,248	62,861
Billings in excess of contract revenues	4,856	6,964
Current portion of long term debt	1,441	1,424
Total current liabilities	155,535	189,868
NOTES PAYABLE	256	323
Deferred Tax Assets	(783)	(783)
PAYABLES TO AFFILIATES	88,088	85,859
OTHER	19,510	20,326
Total liabilities	262,606	295,593
TOTAL EQUITY	626,938	619,116
TOTAL	889,544	914,709
Non Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	931	2,147	1,533	663
Accounts receivable—net	96	799
Contract revenues in excess of billings	2,042	1,718
Prepaid expenses and other current assets	265	218
Total current assets	3,334	4,882
PROPERTY AND EQUIPMENT—Net	8	18
RECEIVABLES FROM AFFILIATES	6,524	6,009
OTHER	1	3
TOTAL	9,867	10,912
LIABILITIES AND EQUITY
Accounts payable	98	227
Accrued expenses	614	509
Billings in excess of contract revenues	115	97
Total current liabilities	827	833
PAYABLES TO AFFILIATES	5,268	3,505
Total liabilities	6,095	4,338
TOTAL EQUITY	3,772	6,574
TOTAL	9,867	10,912
GLDD Corporation [Member]
ASSETS
Cash and cash equivalents	2	2	$ 2	$ 2
Prepaid expenses and other current assets	198	477
Total current assets	200	479
RECEIVABLES FROM AFFILIATES	82,176	70,738
INVESTMENTS IN SUBSIDIARIES	627,171	621,984
OTHER	682	65
TOTAL	710,229	693,266
LIABILITIES AND EQUITY
Accrued expenses	9,317	8,907
Revolving credit facility	45,000
Current portion of long term debt	9,028	6,082
Total current liabilities	63,345	14,989
7 3/8% SENIOR NOTES	272,498	271,998
NOTES PAYABLE	47,565	53,469
DEFERRED INCOME TAXES	71,762	74,789
PAYABLES TO AFFILIATES	5,665	5,709
OTHER	159	139
Total liabilities	460,994	441,093
TOTAL EQUITY	249,235	252,173
TOTAL	710,229	693,266
REVOLVING CREDIT FACILITY		20,000
Consolidation Eliminations [Member]
ASSETS
RECEIVABLES FROM AFFILIATES	(99,021)	(95,073)
INVESTMENTS IN SUBSIDIARIES	(630,710)	(625,690)
TOTAL	(729,731)	(720,763)
LIABILITIES AND EQUITY
PAYABLES TO AFFILIATES	(99,021)	(95,073)
Total liabilities	(99,021)	(95,073)
TOTAL EQUITY	(630,710)	(625,690)
TOTAL	$ (729,731)	$ (720,763)

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 192,192	$ 238,877	$ 355,311	$ 413,434
Costs of contract revenues	(167,936)	(206,590)	(311,065)	(370,465)
Gross profit	24,256	32,287	44,246	42,969
General and administrative expenses	19,751	15,543	39,840	33,491
Impairment of goodwill		2,750		2,750
(Gain) loss on sale of assets—net	687	5	677	(3)
Operating income	3,818	13,989	3,729	6,731
Interest expense—net	(5,903)	(5,567)	(11,624)	(11,197)
Equity in earnings (loss) of joint ventures	128	(2,616)	13	(3,714)
Other income (expense)	(518)	(618)	(1,281)	(1,059)
Income (loss) before income taxes	(2,475)	5,188	(9,163)	(9,239)
Income tax (provision) benefit	756	(2,464)	3,409	3,573
Net income (loss)	(1,719)	2,724	(5,754)	(5,666)
Comprehensive income (loss)	(1,571)	2,777	(5,197)	(6,421)
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(517)	(592)	(977)	(1,581)
Costs of contract revenues	517	592	977	1,581
Equity in earnings (loss) of subsidiaries	(3,094)	(10,696)	(1,863)	(1,523)
Income (loss) before income taxes	(3,094)	(10,696)	(1,863)	(1,523)
Net income (loss)	(3,094)	(10,696)	(1,863)	(1,523)
Comprehensive income (loss)	(3,242)	(10,749)	(2,420)	(768)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	192,709	235,151	356,288	407,505
Costs of contract revenues	(167,005)	(203,184)	(309,188)	(364,388)
Gross profit	25,704	31,967	47,100	43,117
General and administrative expenses	19,806	15,543	39,891	33,491
Impairment of goodwill		2,750		2,750
(Gain) loss on sale of assets—net	687	5	677	(3)
Operating income	5,211	13,669	6,532	6,879
Interest expense—net	(184)	40	(365)	(259)
Equity in earnings (loss) of subsidiaries	(96)		(178)	4
Equity in earnings (loss) of joint ventures	128	(2,616)	13	(3,714)
Other income (expense)	(518)	(618)	(1,273)	(1,052)
Income (loss) before income taxes	4,541	10,475	4,729	1,858
Income tax (provision) benefit	1
Net income (loss)	4,542	10,475	4,729	1,858
Comprehensive income (loss)	4,542	10,475	4,729	1,858
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues		4,318		7,510
Costs of contract revenues	(1,448)	(3,998)	(2,854)	(7,658)
Gross profit	(1,448)	320	(2,854)	(148)
General and administrative expenses			4
Operating income	(1,448)	320	(2,858)	(148)
Other income (expense)			(8)	(7)
Income (loss) before income taxes	(1,448)	320	(2,866)	(155)
Income tax (provision) benefit		(99)		(180)
Net income (loss)	(1,448)	221	(2,866)	(335)
Comprehensive income (loss)	(1,300)	274	(2,309)	(1,090)
GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
General and administrative expenses	(55)		(55)
Operating income	55		55
Interest expense—net	(5,719)	(5,607)	(11,259)	(10,938)
Equity in earnings (loss) of subsidiaries	3,190	10,696	2,041	1,519
Income (loss) before income taxes	(2,474)	5,089	(9,163)	(9,419)
Income tax (provision) benefit	755	(2,365)	3,409	3,753
Net income (loss)	(1,719)	2,724	(5,754)	(5,666)
Comprehensive income (loss)	$ (1,571)	$ 2,777	$ (5,197)	$ (6,421)

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$ 7,260	$ (6,881)
INVESTING ACTIVITIES:
Purchases of property and equipment	(32,150)	(36,830)
Proceeds from dispositions of property and equipment	10,318	115
Net cash flows used in investing activities	(21,832)	(36,715)
FINANCING ACTIVITIES:
Deferred financing fees		(29)
Taxes paid on settlement of vested share awards	(162)	(265)
Repayments of long term note payable	(531)
Repayments of term loan facility	(2,500)	(2,500)
Repayments of equipment debt	(708)	(506)
Proceeds from equipment debt		410
Exercise of options and purchases from employee stock plans	415	846
Excess income tax benefit from share-based compensation		(13)
Borrowings under revolving loans	91,500	79,000
Repayments of revolving loans	(66,500)	(61,000)
Net cash provided by financing activities	21,514	15,943
Effect of foreign currency exchange rates on cash and cash equivalents	110	(40)
Net increase (decrease) in cash and cash equivalents	7,052	(27,693)
Cash and cash equivalents at beginning of period	14,184	42,389
Cash and cash equivalents at end of period	21,236	14,696
Consolidation Eliminations [Member]
INVESTING ACTIVITIES:
Net change in accounts with affiliates	(13,734)	12,571
Net cash flows used in investing activities	(13,734)	12,571
FINANCING ACTIVITIES:
Net change in accounts with affiliates	13,734	(12,571)
Net cash provided by financing activities	13,734	(12,571)
Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	19,388	4,427
INVESTING ACTIVITIES:
Purchases of property and equipment	(32,150)	(36,830)
Proceeds from dispositions of property and equipment	10,318	115
Net change in accounts with affiliates	13,734	(12,571)
Net cash flows used in investing activities	(8,098)	(49,286)
FINANCING ACTIVITIES:
Repayments of equipment debt	(708)	(506)
Proceeds from equipment debt		2
Net change in accounts with affiliates	20,686
Capital contributions		16,800
Intercompany dividends	(23,000)
Net cash provided by financing activities	(3,022)	16,296
Net increase (decrease) in cash and cash equivalents	8,268	(28,563)
Cash and cash equivalents at beginning of period	12,035	41,724
Cash and cash equivalents at end of period	20,303	13,161
Non Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	(2,210)	(322)
FINANCING ACTIVITIES:
Net change in accounts with affiliates	884	1,232
Net cash provided by financing activities	884	1,232
Effect of foreign currency exchange rates on cash and cash equivalents	110	(40)
Net increase (decrease) in cash and cash equivalents	(1,216)	870
Cash and cash equivalents at beginning of period	2,147	663
Cash and cash equivalents at end of period	931	1,533
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	(9,918)	(10,986)
FINANCING ACTIVITIES:
Deferred financing fees		(29)
Taxes paid on settlement of vested share awards	(162)	(265)
Repayments of long term note payable	(531)
Repayments of term loan facility	(2,500)	(2,500)
Proceeds from equipment debt		408
Net change in accounts with affiliates	(35,304)	11,339
Capital contributions		(16,800)
Intercompany dividends	23,000
Exercise of options and purchases from employee stock plans	415	846
Excess income tax benefit from share-based compensation		(13)
Borrowings under revolving loans	91,500	79,000
Repayments of revolving loans	(66,500)	(61,000)
Net cash provided by financing activities	9,918	10,986
Cash and cash equivalents at beginning of period	2	2
Cash and cash equivalents at end of period	$ 2	$ 2