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Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Jun. 30, 2017	Jul. 28, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
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		61,405,170

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 12,643	$ 11,167
Accounts receivable—net	61,957	88,091
Contract revenues in excess of billings	90,830	95,012
Inventories	35,770	37,137
Prepaid expenses and other current assets	54,199	75,819
Total current assets	255,399	307,226
PROPERTY AND EQUIPMENT—Net	416,058	413,008
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,779	85,075
INVENTORIES—Noncurrent	55,460	52,602
INVESTMENTS IN JOINT VENTURES	4,794	4,734
ASSETS HELD FOR SALE—Noncurrent	8,991	9,299
OTHER	14,007	21,644
TOTAL	839,488	893,588
LIABILITIES AND EQUITY
Accounts payable	77,543	103,185
Accrued expenses	40,727	69,043
Billings in excess of contract revenues	5,013	5,141
Current portion of long term debt	2,845	2,465
Total current liabilities	126,128	179,834
REVOLVING CREDIT FACILITY	86,000	104,111
NOTES PAYABLE	12,696	13,293
DEFERRED INCOME TAXES	55,875	68,449
OTHER	7,377	7,013
Total liabilities	608,690	645,698
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock—$.0001 par value; 90,000 authorized, 61,683 and 61,240 shares issued; 61,405 and 60,962 shares outstanding at June 30, 2017 and December 31, 2016, respectively.	6	6
Treasury stock, at cost	(1,433)	(1,433)
Additional paid-in capital	288,167	286,303
Accumulated deficit	(53,323)	(35,841)
Accumulated other comprehensive loss	(2,619)	(1,145)
Total equity	230,798	247,890
TOTAL	839,488	893,588
8% SENIOR NOTES [Member]
LIABILITIES AND EQUITY
SENIOR NOTES	$ 320,614
7 3/8% SENIOR NOTES [Member]
LIABILITIES AND EQUITY
SENIOR NOTES		$ 272,998

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	61,683,000	61,240,000
Common stock, shares outstanding	61,405,000	60,962,000
8% SENIOR NOTES [Member]
Debt instrument, interest rate, stated percentage	8.00%	8.00%
7 3/8% SENIOR NOTES [Member]
Debt instrument, interest rate, stated percentage	7.375%	7.375%

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Contract revenues	$ 176,859	$ 192,192	$ 347,445	$ 355,311
Costs of contract revenues	151,085	167,936	305,489	311,065
Gross profit	25,774	24,256	41,956	44,246
General and administrative expenses	17,267	19,751	34,062	39,840
Loss on sale of assets—net	169	687	180	677
Operating income	8,338	3,818	7,714	3,729
Interest expense—net	(6,441)	(5,903)	(12,023)	(11,624)
Equity in earnings (loss) of joint ventures	(1,468)	128	(1,467)	13
Loss on extinguishment of debt	(2,330)		(2,330)
Other expense	(285)	(518)	(77)	(1,281)
Loss from continuing operations before income taxes	(2,186)	(2,475)	(8,183)	(9,163)
Income tax benefit	1,124	756	3,398	3,409
Loss from continuing operations	(1,062)	(1,719)	(4,785)	(5,754)
Income (loss) from discontinued operations, net of income taxes	368		(12,697)
Net loss	$ (694)	$ (1,719)	$ (17,482)	$ (5,754)
Basic loss per share attributable to continuing operations	$ (0.02)	$ (0.03)	$ (0.08)	$ (0.10)
Basic loss per share attributable to discontinued operations, net of tax			(0.21)
Basic loss per share	$ (0.02)	$ (0.03)	$ (0.29)	$ (0.10)
Basic weighted average shares	61,342	60,711	61,204	60,609
Diluted loss per share attributable to continuing operations	$ (0.02)	$ (0.03)	$ (0.08)	$ (0.10)
Diluted loss per share attributable to discontinued operations, net of tax			(0.21)
Diluted loss per share	$ (0.02)	$ (0.03)	$ (0.29)	$ (0.10)
Diluted weighted average shares	61,342	60,711	61,204	60,609

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

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Statement Of Income And Comprehensive Income [Abstract]

Net loss

$ (694)

$ (1,719)

$ (17,482)

$ (5,754)

Currency translation adjustment—net of tax

^[1]

148

(22)

557

Net unrealized gain on derivatives—net of tax

^[2]

(718)

(1,452)

Other comprehensive income (loss)—net of tax

(712)

148

(1,474)

557

Comprehensive loss

$ (1,406)

$ (1,571)

$ (18,956)

$ (5,197)

[1]	Net of income tax provision of $6 and $99 for the three months ended June 30, 2017 and 2016, respectively. Net of income tax (provision) benefit of $33 and $(370) for the six months ended June 30, 2017 and 2016, respectively.
[2]	Net of income tax provision of $468 and $947 for the three and six months ended June 30, 2017.

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ 6	$ 99	$ 33	$ (370)
Net unrealized (gain) loss on derivatives, tax	$ 468		$ 947

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, 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 (loss)—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)
BALANCE - value at Dec. 31, 2016	247,890	$ 6	$ (1,433)	286,303	(35,841)	(1,145)
BALANCE - shares at Dec. 31, 2016		61,240	(278)
Share-based compensation, value	1,758			1,758
Share-based compensation, shares		164
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(328)			(328)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		147
Exercise of options and purchases from employee stock plans, value	434			434
Exercise of options and purchases from employee stock plans, shares		132
Net loss	(17,482)				(17,482)
Other comprehensive Income (loss)—net of tax	(1,474)					(1,474)
BALANCE - value at Jun. 30, 2017	$ 230,798	$ 6	$ (1,433)	$ 288,167	$ (53,323)	$ (2,619)
BALANCE - shares at Jun. 30, 2017		61,683	(278)

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES:
Net loss	$ (17,482)	$ (5,754)
Loss from discontinued operations, net of income taxes	(12,697)
Loss from continuing operations	(4,785)	(5,754)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	25,629	28,820
Equity in earnings of joint ventures	(3,087)	(3,815)
Cash distributions from joint ventures	4,486	1,233
Loss on extinguishment of 7 3/8% senior notes	2,330
Deferred income taxes	(3,428)	(2,657)
Loss on sale of assets	180	677
Amortization of deferred financing fees	1,646	1,249
Unrealized net (gain) loss from mark-to-market valuations of derivatives	1,089	(5,605)
Unrealized foreign currency gain	(115)	(244)
Share-based compensation expense	1,758	2,006
Changes in assets and liabilities:
Accounts receivable	26,126	19,553
Contract revenues in excess of billings	4,212	6,604
Inventories	(1,536)	(4,311)
Prepaid expenses and other current assets	(693)	(4,162)
Accounts payable and accrued expenses	(34,498)	(23,456)
Billings in excess of contract revenues	51	(2,108)
Other noncurrent assets and liabilities	1,379	(770)
Net cash flows provided by operating activities of continuing operations	20,744	7,260
Net cash flows used in operating activities of discontinued operations	(20,900)
Cash provided by (used in) operating activities	(156)	7,260
INVESTING ACTIVITIES:
Purchases of property and equipment	(34,266)	(32,150)
Proceeds from dispositions of property and equipment	2,212	10,318
Changes in restricted cash	7,035
Cash used in investing activities	(25,019)	(21,832)
FINANCING ACTIVITIES:
Proceeds from issuance of 8% senior notes	325,000
Redemption of 7 3/8% senior notes	(275,000)
7 3/8% senior notes tender premium	744
Deferred financing fees	(4,519)
Repayments of long term note payable	(567)	(531)
Repayments of term loan facility		(2,500)
Proceeds from equipment debt	1,241
Repayments of equipment debt	(819)	(708)
Taxes paid on settlement of vested share awards	(328)	(162)
Exercise of options and purchases from employee stock plans	434	415
Borrowings under revolving loans	52,046	91,500
Repayments of revolving loans	(70,157)	(66,500)
Cash provided by financing activities	26,587	21,514
Effect of foreign currency exchange rates on cash and cash equivalents	64	110
Net increase in cash and cash equivalents	1,476	7,052
Cash and cash equivalents at beginning of period	11,167	14,184
Cash and cash equivalents at end of period	12,643	21,236
Supplemental Cash Flow Information
Cash paid for interest	19,835	12,815
Cash paid (refunded) for income taxes	555	(331)
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 4,578	$ 4,289

Condensed Consolidated Statements Of Cash Flows (Parenthetical)	Jun. 30, 2017	May 31, 2017	Dec. 31, 2016
8% SENIOR NOTES [Member]
Debt instrument, interest rate, stated percentage	8.00%	8.00%	8.00%
7 3/8% SENIOR NOTES [Member]
Debt instrument, interest rate, stated percentage	7.375%	7.375%	7.375%

Basis Of Presentation

6 Months Ended

Jun. 30, 2017

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, 2016. 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, 2017, and its results of operations for the three and six months ended June 30, 2017 and 2016 and cash flows for the six months ended June 30, 2017 and 2016 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 23% 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 two operating segments: dredging and environmental & infrastructure, which are also the Company’s two reportable segments. The Company has determined that dredging, Terra Contracting Services, LLC (“Terra”) and Great Lakes Environmental & Infrastructure, LLC (“GLEI”) are the Company’s three reporting units.

The Company performed its most recent annual test of impairment as of July 1, 2016 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 2017 should no triggering events occur which would require a test prior to the next annual test.

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 January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2017-04 (“ASU 2017-04”), Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendment removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. The guidance is effective for fiscal years beginning after December 15, 2019. The Company does not anticipate that the adoption of ASU 2017-04 will have a material effect on the Company’s consolidated financial statements.

In November 2016, the FASB issued Accounting Standard Update No. 2016-18 (“ASU 2016-18”), Statement of Cashflows (Topic 230): Restricted Cash. The amendments require that the statement of cash flows explain the changes during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore amounts generally described as restricted cash or restricted cash equivalents should be included with the cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017. The Company does not anticipate that the adoption of ASU 2016-18 will have a material effect on the Company’s consolidated financial statements.

In August 2016, the FASB issued Accounting Standard Update No. 2016-15 (“ASU 2016-15”), Classification of Certain Cash Receipts and Cash Payments, which amends FASB’s standards for reporting cash flows in general-purpose financial statements. The amendments address the diversity in practice related to the classification of certain cash receipts and payments. The guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the impact of ASU 2016-15 on its consolidated financial statements.

In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842). The FASB 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 consolidated financial statements.

In May 2014, the FASB issued Accounting Standard Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), and subsequently issued other Accounting Standard Updates related to Accounting Standards Codification Topic 606 (collectively, “ASC 606”), which supersede the existing revenue recognition requirements. ASC 606 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. ASC 606 has been deferred to be effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period, which will be our first quarter of fiscal 2018. Early adoption is permitted in fiscal 2017. The Company currently expects to adopt ASC 606 as of January 1, 2018, under the modified retrospective method where the cumulative effect is recognized at the date of initial application. The Company’s evaluation of ASC 606 is ongoing and not complete. The Company is currently evaluating the overall impacts that ASC 606 will have on the methods currently used to measure progress toward completion (which affect the timing of recognition of revenue) and the changes necessitated on our financial systems, existing internal controls and processes to comply with the guidance. The FASB has issued and may issue in the future, interpretative guidance, which may cause the Company’s evaluation to change in future periods prior to adoption. In addition, the ongoing assessment may be impacted by implementation guidance specific to the construction industry. Accordingly, the Company is still evaluating the effect of the adoption of ASC 606 on its consolidated financial statements.

Earnings Per Share

6 Months Ended

Jun. 30, 2017

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, 2017 and 2016, the dilutive effect of 603 thousand and 651 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 six months ended June 30, 2017 and 2016, the dilutive effect of 654 thousand and 523 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 months ended June 30, 2017 and 2016, 1,331 thousand and 1,603 thousand stock options and restricted stock units, respectively, 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 six months ended June 30, 2017 and 2016, 1,455 thousand and 1,694 thousand stock options and restricted stock units, respectively, were excluded from the calculation of diluted earnings per share as such stock options and restricted stock units were determined to be anti-dilutive.

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

	Three Months Ended						Six Months Ended
(shares in thousands)	June 30,						June 30,
	2017			2016			2017			2016

Loss from continuing operations	$	(1,062	)	$	(1,719	)	$	(4,785	)	$	(5,754	)
Income (loss) from discontinued operations, net of income taxes		368			—			(12,697	)		—
Net loss		(694	)		(1,719	)		(17,482	)		(5,754	)

Weighted-average common shares outstanding — basic		61,342			60,711			61,204			60,609
Effect of stock options and restricted stock units		—			—			—			—

Weighted-average common shares outstanding — diluted		61,342			60,711			61,204			60,609

Loss per share from continuing operations — basic	$	(0.02	)	$	(0.03	)	$	(0.08	)	$	(0.10	)
Loss per share from continuing operations — diluted	$	(0.02	)	$	(0.03	)	$	(0.08	)	$	(0.10	)

Accounts Receivable And Contracts In Progress

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

Accounts receivable and contracts in progress

Accounts receivable at June 30, 2017 and December 31, 2016 are as follows:

	June 30,			December 31,
	2017			2016
Completed contracts	$	8,953		$	18,727
Contracts in progress		41,267			53,137
Retainage		16,975			21,399
		67,195			93,263
Allowance for doubtful accounts		(763	)		(747	)

Total accounts receivable—net	$	66,432		$	92,516

Current portion of accounts receivable—net	$	61,957		$	88,091
Long-term accounts receivable and retainage		4,475			4,425
Total accounts receivable—net	$	66,432		$	92,516

The components of contracts in progress at June 30, 2017 and December 31, 2016 are as follows:

	June 30,			December 31,
	2017			2016
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	579,761		$	587,371
Amounts billed		(514,069	)		(511,548	)
Costs and earnings in excess of billings for contracts in progress		65,692			75,823
Costs and earnings in excess of billings for completed contracts		25,138			19,189
Total contract revenues in excess of billings	$	90,830		$	95,012

Billings in excess of costs and earnings:
Amounts billed	$	(325,617	)	$	(268,754	)
Costs and earnings for contracts in progress		320,604			263,613
Total billings in excess of contract revenues	$	(5,013	)	$	(5,141	)

The Company has $17,860 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 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, 2017

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses

Accrued expenses at June 30, 2017 and December 31, 2016 are as follows:

	June 30,		December 31,
	2017		2016

Insurance	$	15,905	$	18,114
Payroll and employee benefits		6,441		10,028
Interest		3,268		8,660
Accumulated deficit in joint ventures		2,379		17,016
Fuel hedge contracts		1,853		—
Percentage of completion adjustment		1,758		3,322
Income and other taxes		1,592		3,208
Other		7,531		8,695
Total accrued expenses	$	40,727	$	69,043

Long-term Debt

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt

Credit Agreement

On December 30, 2016, the Company, Great Lakes Dredge & Dock Company, LLC, NASDI Holdings, LLC, Great Lakes Dredge & Dock Environmental, Inc., Great Lakes Environmental & Infrastructure Solutions, LLC and Great Lakes Environmental & Infrastructure, LLC (collectively, the “Credit Parties”) entered into a revolving credit and security agreement, as subsequently amended, (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, PNC Bank, National Association, as Agent, PNC Capital Markets, The PrivateBank and Trust Company, Suntrust Robinson Humphrey, Inc., Capital One, National Association and Bank of America, N.A., as Joint Lead Arrangers and Joint Bookrunners, Texas Capital Bank, National Association, as Syndication Agent and Woodforest National Bank, as Documentation Agent. The Credit Agreement, which replaced the Company’s former revolving credit agreement, provides for a senior secured revolving credit facility in an aggregate principal amount of up to $250,000, subfacilities for the issuance of standby letters of credit up to a $250,000 sublimit and swingline loans up to a $25,000 sublimit. The maximum borrowing capacity under the Credit Agreement is determined by a formula and may fluctuate depending on the value of the collateral included in such formula at the time of determination. The Credit Agreement also includes an increase option that will allow the Company to increase the senior secured revolving credit facility by an aggregate principal amount of up to $100,000. This increase is subject to lenders providing incremental commitments for such increase, the Credit Parties having adequate borrowing capacity and provided that no default or event of default exists both before and after giving effect to such incremental commitment increase.

The Credit Agreement contains customary representations and affirmative and negative covenants, including a springing financial covenant that requires the Credit Parties to maintain a fixed charge coverage ratio (ratio of earnings before income taxes, depreciation and amortization, net interest expenses, non-cash charges and losses and certain other non-recurring charges, minus capital expenditures, income and franchise taxes, to net cash interest expense plus scheduled cash principal payments with respect to debt plus restricted payments paid in cash) of not more than 1.10 to 1.00. The Credit Parties are also restricted in the amount of capital expenditures they may make in each fiscal year. 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 providers. The obligations of the Credit Parties under the Credit Agreement will be 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. Borrowings under the Credit Agreement were or will be used to refinance existing indebtedness under the Company’s former revolving credit agreement, refinance existing indebtedness under the Company’s former term loan agreement, pay fees and expenses related to the Credit Agreement, finance acquisitions permitted under the Credit Agreement, finance ongoing working capital and for other general corporate purposes. The Credit Agreement matures on December 30, 2019.

The obligations under the Credit Agreement are secured by substantially all of the assets of the Credit Parties. The outstanding obligations thereunder shall be secured by a valid first priority perfected lien on substantially all of the vessels of the Credit Parties and a valid perfected lien on all domestic accounts receivable and substantially all other assets of the Credit Parties, subject to the permitted liens and interests of other parties (including the Company’s surety bonding provider).

Interest on the senior secured revolving credit facility of the Credit Agreement is equal to either a base rate option or LIBOR option, at the Company’s election. The base rate option is (1) the base commercial lending rate of PNC Bank, National Association, as publicly announced plus (2)(a) an interest margin of 2.0% or (b) after the date on which a borrowing base certificate is required to be delivered under Section 9.2 of the Credit Agreement (commencing with the fiscal quarter ending December 31, 2017, the “Adjustment Date”), an interest margin ranging between 1.5% and 2.0% depending on the quarterly average undrawn availability on the senior secured revolving credit facility. The LIBOR option is the sum of (1) LIBOR and (2)(a) an interest margin of 3.0% or (b) after the Adjustment Date, an interest rate margin ranging between 2.5% to 3.0% per annum depending on the quarterly average undrawn availability on the senior secured revolving credit facility. The Credit Agreement is subject to an unused fee ranging from 0.25% to 0.375% per annum depending on the amount of average daily outstandings under the senior secured revolving credit facility.

As of June 30, 2017, the Company had $86,000 of borrowings on the revolver and $40,427 of letters of credit outstanding, resulting in $98,999 of availability under the Credit Agreement.

Prior revolving credit agreement and term loan facility

In conjunction with the Credit Agreement entered into on December 30, 2016, the senior revolving credit agreement with an aggregate principal amount of up to $199,000 and the senior secured term loan facility consisting of a term loan in an aggregate principal amount of $50,000 were paid in full. Depending on the Company’s consolidated leverage ratio, previous borrowings under the revolving credit facility bore interest at the option of the Company at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum. The previous borrowings under the senior secured term loan facility bore interest at a fixed rate of 4.655% per annum.

Senior Notes

In May 2017, the Company issued $325,000 of 8.000% senior notes (“8% Senior Notes”) due May 15, 2022. The 8% Senior Notes were issued at 100% of face value resulting in net proceeds of $321,653, net of underwriting fees. In connection with the issuance of the 8% Senior Notes, the Company retired all of its $275,000 of 7.375% senior notes due February 2019 for $282,638, which included a tender premium and accrued and unpaid interest. The Company used the remaining net proceeds from the debt offering to reduce the Company's indebtedness under its Credit Agreement.

Other

The Company enters into note arrangements to finance certain vessels and ancillary equipment. The current portion of all equipment notes is $2,845. The long term portion is $14,149 and is included in notes payable or other long term liabilities.

Fair Value Measurements

6 Months Ended

Jun. 30, 2017

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, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,853	$	—	$	1,853	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 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	$	2,293	$	—	$	2,293	$	—

Fuel hedge contracts

The Company is exposed to certain market risks, primarily commodity price risk as it relates to 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, 2017, 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 2018. As of June 30, 2017, there were 9.9 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through May 2018. Under these swap agreements, the Company will pay fixed prices ranging from $1.53 to $1.76 per gallon.

At June 30, 2017 the fair value liability of the fuel hedge contracts was estimated to be $1,853 and is recorded in accrued expenses. At December 31, 2016, the fair value asset of the fuel hedge contracts was estimated to be $2,293 and is recorded in prepaid expenses and other current assets. For fuel hedge contracts considered to be highly effective, the losses reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the six months ended June 30, 2017 were $195. The remaining gains and losses included in accumulated other comprehensive loss at June 30, 2017 will be reclassified into earnings over the next eleven months, corresponding to the period during which the hedged fuel is expected to be utilized. Changes in the fair value of fuel hedge contracts not considered highly effective are recorded as cost of contract revenues in the Statement of Operations. 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, 2017 and December 31, 2016 is as follows:

		Fair Value at
		June 30,		December 31,
	Balance Sheet Location	2017		2016
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	—	$	546
Derivatives not designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets		—		1,747
Total asset derivatives		$	—	$	2,293

Liability derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	1,853	$	—

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,
	2017			2016		2017			2016
Cumulative translation adjustments—net of tax	$	6		$	148	$	(22	)	$	557
Derivatives:
Reclassification of derivative losses to earnings—net of tax		155			—		195			—
Change in fair value of derivatives—net of tax		(873	)		—		(1,647	)		—
Net unrealized gain on derivatives—net of tax		(718	)		—		(1,452	)		—
Total other comprehensive income (loss)	$	(712	)	$	148	$	(1,474	)	$	557

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

		Three Months Ended				Six Months Ended
		June 30,				June 30,
	Statement of Operations Location	2017		2016		2017		2016
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	257	$	—	$	323	$	—
	Income tax benefit		102		—		128		—
		$	155	$	—	$	195	$	—

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 revolving credit agreement approximates fair value. In May 2017, the Company issued a total of $325,000 of 8% senior notes due May 15, 2022, which were outstanding at June 30, 2017 (see Note 5). The 8% Senior Notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the 8% Senior Notes. The fair value of the senior notes was $331,110 at June 30, 2017, 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, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

Share-based compensation

On May 11, 2017, the Company’s stockholders approved the Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan (the “Incentive Plan”), which previously had been approved by the Company’s board of directors subject to stockholder approval. The Incentive Plan permits the granting of stock options, stock appreciation rights, restricted stock and restricted stock units to the Company’s employees and directors for up to 3.3 million shares of common stock, plus an additional 1.7 million shares underlying equity awards issued under the 2007 Long-Term Incentive Plan.

During the six months ended June 30, 2017, the Company granted 920 thousand restricted stock units to certain employees. 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 $840 and $1,079 for the three months ended June 30, 2017 and 2016, respectively, and $1,758 and $2,006 for the six months ended June 30, 2017 and 2016, respectively.

Beginning in the first quarter of 2017, the Company includes income taxes related to share-based compensation as a component of net income.

Commitments And Contingencies

6 Months Ended

Jun. 30, 2017

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 bonding agreements with Argonaut Insurance Company, Berkley Insurance Company, Chubb Surety, Liberty Mutual Insurance Company and Zurich American Insurance Company (“Zurich”), under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty and Surety Company of America. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At June 30, 2017, the Company had outstanding performance bonds with a notional amount of approximately $1,083,982, of which $41,260 relates to projects from the Company’s historical environmental & infrastructure businesses. The revenue value remaining in backlog related to these projects totaled approximately $347,860.

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 and issued Zurich a letter of credit related to this exposure. In February 2017, the Company was notified by Zurich of an alleged default triggered on a historical demolition surety performance bond in the aggregate of approximately $20,000 for failure of the contractor to perform in accordance with the terms of a project. In May 2017, Zurich drew upon the letter of credit in the amount of $20,881. In order to fund the draw on the letter of credit, the Company had to increase the borrowings on its revolving credit facility. As the outstanding letters of credit previously reduced our availability under the revolving credit facility, this draw down on our letter of credit does not impact our liquidity or capital availability.

Pursuant to the terms of sale of our historical demolition business, the Company received an indemnification from the buyer for losses resulting from the bonding arrangement. The Company intends to aggressively pursue enforcement of the indemnification provisions if the buyer of the historical demolition business is found to be in default of its obligations. The Company cannot estimate the amount or range of recoveries related to the indemnification or resolution of the Company’s responsibilities under the surety bond. The surety bond claim impact has been included in discontinued operations and is discussed in Note 10.

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. Legal actions brought by the Company to enforce the buyer’s obligations under the sale agreement are described below.

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 the 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.

Also pursuant to the terms of the agreement to sell NASDI and Yankee and as described above, the Company agreed to keep in place surety bonds for certain pending demolition projects, and the buyer agreed to indemnify the Company for all losses relating to those bonds. As described above, in May 2017, Zurich drew upon the Company’s letter of credit in the amount of $20,881. On May 26, 2017, the Company and NASDI Holdings, LLC brought a second action in the Delaware Court of Chancery seeking indemnification for all losses relating to the bonds for that project.

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, 2017

Equity Method Investments And Joint Ventures [Abstract]

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, 2017 and December 31, 2016, the Company had net advances to TerraSea of $4,758 and $24,696, respectively, which are recorded in prepaid expenses and 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 $2,379 and $17,016 at June 30, 2017 and December 31, 2016, respectively, which is presented in accrued expenses. The Company is in the final stages of the wind down of TerraSea with its joint venture partner.

During the second quarter of 2017, the Company and the joint venture partner agreed to a final resolution of the net advances through additional funding of the joint venture. The Company recorded additional losses of $1,458 related to this agreement during the quarter ended June 30, 2017. There are no remaining TerraSea projects at June 30, 2017.

Business Combinations And Dispositions

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Business Combinations And Dispositions

10.

Business combinations and dispositions

Discontinued operations

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. The amount and timing of any realization of additional net proceeds has been 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.

As discussed in Note 8, the Company was notified by Zurich of an alleged default triggered on a historical demolition surety performance bond in the aggregate of approximately $20,000 for failure of the contractor to perform in accordance with the terms of a project. Zurich could be obligated to reimburse the loss, damage and expense that may arise from the alleged default. The Company estimated its exposure to a surety bond claim, including associated expenses, to be $20,900 and has recorded this amount in discontinued operations during the six months ended June 30, 2017 as follows:

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2017		2017

Revenue	$	—	$	—

Loss before income taxes from discontinued operations	$	—	$	(20,900	)
Income tax benefit		368		8,203
Loss from discontinued operations, net of income taxes	$	368	$	(12,697	)

Magnus Pacific acquisition

On November 4, 2014, the Company acquired Magnus Pacific Corporation (“Magnus”), a California corporation, for an aggregate purchase price of approximately $40 million. Under the terms of the acquisition, the aggregate purchase price is satisfied by payment of $25 million paid at closing, the issuance of a promissory note and an earnout payment.

Magnus did not reach the minimum EBITDA threshold for 2015 designated in the secured promissory note; therefore, during 2015, the Company reduced the remaining fair value to zero. Under the terms of the acquisition, as amended, the maximum potential aggregate earnout (the “Earnout Payment”) is $11,400 and will be determined based on the attainment of an average Adjusted EBITDA target of GLEI for the years ending December 31, 2017, December 31, 2018 and December 31, 2019. The Earnout Payment may be paid in cash or shares of the Company’s common stock, at the Company’s option. The Company remeasures the fair value of the contingent Earnout Payment based on projections of the earnings target for the business. Based on the Company’s current projections, GLEI is not expected to reach the minimum Adjusted EBITDA threshold designated in the amended share purchase agreement.

Other

During the fourth quarter of 2016, the Company sold assets associated with certain service lines of the environmental & infrastructure segment’s business, excluding assets supporting the remediation service line.

Segment Information

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Information

11.

Segment information

The Company and its subsidiaries currently operate in two reportable segments: dredging and environmental & infrastructure. 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,
	2017			2016			2017			2016
Dredging
Contract revenues	$	152,507		$	153,661		$	305,561		$	298,674
Operating income		8,481			10,624			10,587			21,209

Environmental & infrastructure
Contract revenues	$	24,711		$	39,782		$	43,935		$	58,872
Operating loss		(143	)		(6,806	)		(2,873	)		(17,480	)

Intersegment revenues	$	(359	)	$	(1,251	)	$	(2,051	)	$	(2,235	)
Total
Contract revenues	$	176,859		$	192,192		$	347,445		$	355,311
Operating income		8,338			3,818			7,714			3,729

Foreign dredging revenue for the three and six months ended June 30, 2017 of $12,420 and $31,574, respectively, was mostly attributable to work done in the Middle East. Foreign dredging revenue for the three and six months ended June 30, 2016 was $11,683 and $13,192, 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.

Subsidiary Guarantors

6 Months Ended

Jun. 30, 2017

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Subsidiary Guarantors

12.

Subsidiary guarantors

The Company’s long-term debt at June 30, 2017 includes $325,000 of 8.000% senior notes due May 15, 2022. The Company’s obligations under these senior unsecured notes are guaranteed by certain of the Company’s 100% owned domestic subsidiaries. Such guarantees are full, unconditional and joint and several.

In connection with the 8% Senior Notes issued in May 2017, certain of the Company’s 100% owned domestic subsidiaries were released as subsidiary guarantors of the debt. Accordingly, the 2016 financial information included below has been recast to reflect the release of these entities as subsidiary guarantors.

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, 2017 and December 31, 2016;

(ii)

statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2017 and 2016; and

(iii)

statements of cash flows for the six months ended June 30, 2017 and 2016.

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF JUNE 30, 2017
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	12,958		$	68		$	(383	)	$	—		$	12,643
Accounts receivable — net		59,583			3,457			—			(1,083	)		61,957
Contract revenues in excess of billings		87,328			3,502			—			—			90,830
Inventories		35,770			—			—			—			35,770
Prepaid expenses and other current assets		51,554			2,622			23			—			54,199
Total current assets		247,193			9,649			(360	)		(1,083	)		255,399

PROPERTY AND EQUIPMENT—Net		415,509			549			—			—			416,058
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		84,394			385			—			—			84,779
INVENTORIES — Noncurrent		55,460			—			—			—			55,460
INVESTMENTS IN JOINT VENTURES		4,745			49			—			—			4,794
ASSETS HELD FOR SALE—Noncurrent		8,436			555			—			—			8,991
RECEIVABLES FROM AFFILIATES		48,686			17,526			172,294			(238,506	)		—
INVESTMENTS IN SUBSIDIARIES		—			—			540,750			(540,750	)		—
OTHER		8,162			1			5,844			—			14,007
TOTAL	$	872,585		$	28,714		$	718,528		$	(780,339	)	$	839,488

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	77,954		$	672		$	—		$	(1,083	)	$	77,543
Accrued expenses		35,284			1,758			3,685			—			40,727
Billings in excess of contract revenues		5,013			—			—			—			5,013
Current portion of long term debt		1,667			—			1,178			—			2,845
Total current liabilities		119,918			2,430			4,863			(1,083	)		126,128

8% SENIOR NOTES		—			—			320,614			—			320,614
REVOLVING CREDIT FACILITY		—			—			86,000			—			86,000
NOTES PAYABLE		—			—			12,696			—			12,696
DEFERRED INCOME TAXES		(1,833	)		—			57,708			—			55,875
PAYABLES TO AFFILIATES		171,501			61,331			5,674			(238,506	)		—
INVESTMENTS IN SUBSIDIARIES		30,927			—			—			(30,927	)		—
OTHER		7,221			(19	)		175			—			7,377
Total liabilities		327,734			63,742			487,730			(270,516	)		608,690

TOTAL EQUITY		544,851			(35,028	)		230,798			(509,823	)		230,798
TOTAL	$	872,585		$	28,714		$	718,528		$	(780,339	)	$	839,488

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2016
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	10,414		$	751		$	2	$	—		$	11,167
Accounts receivable — net		75,412			14,242			—		(1,563	)		88,091
Contract revenues in excess of billings		91,478			3,534			—		—			95,012
Inventories		37,137			—			—		—			37,137
Prepaid expenses and other current assets		73,131			2,688			—		—			75,819
Total current assets		287,572			21,215			2		(1,563	)		307,226

PROPERTY AND EQUIPMENT—Net		407,516			5,492			—		—			413,008
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		84,643			432			—		—			85,075
INVENTORIES — Noncurrent		52,602			—			—		—			52,602
INVESTMENTS IN JOINT VENTURES		4,685			49			—		—			4,734
ASSETS HELD FOR SALE—Noncurrent		8,390			909			—		—			9,299
RECEIVABLES FROM AFFILIATES		58,284			16,807			82,340		(157,431	)		—
INVESTMENTS IN SUBSIDIARIES		—			—			636,216		(636,216	)		—
OTHER		14,692			1			6,951		—			21,644
TOTAL	$	918,384		$	44,905		$	725,509	$	(795,210	)	$	893,588

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	101,795		$	2,879		$	17	$	(1,506	)	$	103,185
Accrued expenses		55,940			3,222			9,881		—			69,043
Billings in excess of contract revenues		4,699			499			—		(57	)		5,141
Current portion of long term debt		305			1,015			1,145		—			2,465
Total current liabilities		162,739			7,615			11,043		(1,563	)		179,834

7 3/8% SENIOR NOTES		—			—			272,998		—			272,998
REVOLVING CREDIT FACILITY		—			—			104,111		—			104,111
NOTE PAYABLE		—			—			13,293		—			13,293
DEFERRED INCOME TAXES		(1,833	)		—			70,282		—			68,449
PAYABLES TO AFFILIATES		80,769			70,921			5,741		(157,431	)		—
INVESTMENTS IN SUBSIDIARIES		32,000			—			—		(32,000	)		—
OTHER		5,925			937			151		—			7,013
Total liabilities		279,600			79,473			477,619		(190,994	)		645,698

TOTAL EQUITY		638,784			(34,568	)		247,890		(604,216	)		247,890
TOTAL	$	918,384		$	44,905		$	725,509	$	(795,210	)	$	893,588

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)
FOR THE THREE MONTHS ENDED JUNE 30, 2017
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	174,360		$	3,061		$	—		$	(562	)	$	176,859
Costs of contract revenues		(149,800	)		(1,847	)		—			562			(151,085	)
Gross profit		24,560			1,214			—			—			25,774
OPERATING EXPENSES:
General and administrative expenses		16,848			425			(6	)		—			17,267
(Gain) loss on sale of assets—net		266			(97	)		—			—			169
Operating income		7,446			886			6			—			8,338
Interest expense—net		315			(325	)		(6,431	)		—			(6,441	)
Equity in earnings of subsidiaries		1,644			—			6,569			(8,213	)		—
Equity in loss of joint ventures		(1,468	)		—			—			—			(1,468	)
Loss on extinguishment of debt		—			—			(2,330	)		—			(2,330	)
Other income (expense)		(506	)		221			—			—			(285	)
Income (loss) from continuing operations before income taxes		7,431			782			(2,186	)		(8,213	)		(2,186	)
Income tax benefit		—			—			1,124			—			1,124
Income (loss) from continuing operations		7,431			782			(1,062	)		(8,213	)		(1,062	)
Income from discontinued operations, net of income taxes		—			—			368			—			368
Net income (loss)	$	7,431		$	782		$	(694	)	$	(8,213	)	$	(694	)

Comprehensive income (loss)	$	6,713		$	788		$	(1,406	)	$	(7,501	)	$	(1,406	)

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	177,749		$	15,551		$	—		$	(1,108	)	$	192,192
Costs of contract revenues		(148,127	)		(20,917	)		—			1,108			(167,936	)
Gross profit		29,622			(5,366	)		—			—			24,256
OPERATING EXPENSES:
General and administrative expenses		16,356			3,450			(55	)		—			19,751
(Gain) loss on sale of assets—net		690			(3	)		—			—			687
Operating income (loss)		12,576			(8,813	)		55			—			3,818
Interest expense—net		171			(355	)		(5,719	)		—			(5,903	)
Equity in earnings (loss) of subsidiaries		(7,808	)		—			3,190			4,618			—
Equity in earnings of joint ventures		128			—			—			—			128
Other income (expense)		(526	)		8			—			—			(518	)
Income (loss) before income taxes		4,541			(9,160	)		(2,474	)		4,618			(2,475	)
Income tax benefit		1			—			755			—			756
Net income (loss)	$	4,542		$	(9,160	)	$	(1,719	)	$	4,618		$	(1,719	)

Comprehensive income (loss)	$	4,542		$	(9,012	)	$	(1,571	)	$	4,470		$	(1,571	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS
FOR THE SIX MONTHS ENDED JUNE 30, 2017
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	344,298		$	4,277		$	—		$	(1,130	)	$	347,445
Costs of contract revenues		(302,340	)		(4,279	)		—			1,130			(305,489	)
Gross profit		41,958			(2	)		—			—			41,956
OPERATING EXPENSES:
General and administrative expenses		33,326			736			—			—			34,062
(Gain) loss on sale of assets—net		260			(80	)		—			—			180
Operating income (loss)		8,372			(658	)		—			—			7,714
Interest expense—net		637			(658	)		(12,002	)		—			(12,023	)
Equity in earnings of subsidiaries		1,041			—			6,135			(7,176	)		—
Equity in loss of joint ventures		(1,467	)		—			—			—			(1,467	)
Loss on extinguishment of debt		—			—			(2,330	)		—			(2,330	)
Other income (expense)		(463	)		386			—			—			(77	)
Income (loss) from continuing operations before income taxes		8,120			(930	)		(8,197	)		(7,176	)		(8,183	)
Income tax (provision) benefit		—			(14	)		3,412			—			3,398
Income (loss) from continuing operations		8,120			(944	)		(4,785	)		(7,176	)		(4,785	)
Loss from discontinued operations, net of income taxes		(20,900	)		—			(12,697	)		20,900			(12,697	)
Net loss	$	(12,780	)	$	(944	)	$	(17,482	)	$	13,724		$	(17,482	)

Comprehensive loss	$	(14,232	)	$	(966	)	$	(18,956	)	$	15,198		$	(18,956	)

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	332,328		$	24,628		$	—		$	(1,645	)	$	355,311
Costs of contract revenues		(277,090	)		(35,620	)		—			1,645			(311,065	)
Gross profit		55,238			(10,992	)		—			—			44,246
OPERATING EXPENSES:
General and administrative expenses		32,915			6,980			(55	)		—			39,840
(Gain) loss on sale of assets—net		681			(4	)		—			—			677
Operating income (loss)		21,642			(17,968	)		55			—			3,729
Interest expense—net		368			(733	)		(11,259	)		—			(11,624	)
Equity in earnings (loss) of subsidiaries		(16,781	)		—			2,041			14,740			—
Equity in earnings of joint ventures		13			—			—			—			13
Other expense		(513	)		(768	)		—			—			(1,281	)
Income (loss) before income taxes		4,729			(19,469	)		(9,163	)		14,740			(9,163	)
Income tax benefit		—			—			3,409			—			3,409
Net income (loss)	$	4,729		$	(19,469	)	$	(5,754	)	$	14,740		$	(5,754	)

Comprehensive income (loss)	$	4,729		$	(18,912	)	$	(5,197	)	$	14,183		$	(5,197	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2017
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	$	37,010		$	649		$	(16,915	)	$	—		$	20,744
Net cash flows used in operating activities of discontinued operations		(20,900	)		—			—			—			(20,900	)
Cash provided by (used in) operating activities		16,110			649			(16,915	)		—			(156	)

INVESTING ACTIVITIES:
Purchases of property and equipment		(41,828	)		7,562			—			—			(34,266	)
Proceeds from dispositions of property and equipment		1,229			983			—			—			2,212
Changes in restricted cash		7,035			—			—			—			7,035
Net change in accounts with affiliates		10,388			—			(90,635	)		80,247			—
Transfer to parent		—			—			81,000			(81,000	)		—
Cash provided by (used in) investing activities		(23,176	)		8,545			(9,635	)		(753	)		(25,019	)

FINANCING ACTIVITIES:
Proceeds from issuance of 8% senior notes		—			—			325,000			—			325,000
Redemption of 7 3/8% senior notes		—			—			(275,000	)		—			(275,000	)
7 3/8% senior notes tender premium		—			—			(744	)		—			(744	)
Deferred financing fees		—			—			(4,519	)		—			(4,519	)
Repayments of long term note payable		—			—			(567	)		—			(567	)
Proceeds from equipment debt		1,241			—			—			—			1,241
Repayments of equipment debt		(800	)		(19	)		—			—			(819	)
Net change in accounts with affiliates		90,169			(9,922	)		—			(80,247	)		—
Transfer to parent		(81,000	)		—			—			81,000			—
Taxes paid on settlement of vested share awards		—			—			(328	)		—			(328	)
Exercise of options and purchases from employee stock plans		—			—			434			—			434
Borrowings under revolving loans		—			—			52,046			—			52,046
Repayments of revolving loans		—			—			(70,157	)		—			(70,157	)
Cash provided by (used in) financing activities		9,610			(9,941	)		26,165			753			26,587

Effect of foreign currency exchange rates on cash and cash equivalents		—			64			—			—			64

Net increase (decrease) in cash and cash equivalents		2,544			(683	)		(385	)		—			1,476

Cash and cash equivalents at beginning of period		10,414			751			2			—			11,167

Cash and cash equivalents at end of period	$	12,958		$	68		$	(383	)	$	—		$	12,643

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	$	23,152		$	(5,974	)	$	(9,918	)	$	—		$	7,260

INVESTING ACTIVITIES:
Purchases of property and equipment		(32,129	)		(21	)		—			—			(32,150	)
Proceeds from dispositions of property and equipment		10,289			29			—			—			10,318
Net change in accounts with affiliates		(2,618	)		—			—			2,618			—
Cash provided by (used in) investing activities		(24,458	)		8			—			2,618			(21,832	)

FINANCING ACTIVITIES:
Repayments of long term note payable		—			—			(531	)		—			(531	)
Repayments of term loan facility		—			—			(2,500	)		—			(2,500	)
Repayment of equipment debt		(146	)		(562	)		—			—			(708	)
Net change in accounts with affiliates		31,585			6,337			(35,304	)		(2,618	)		—
Transfer to parent		(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	)
Cash provided by (used in) financing activities		8,439			5,775			9,918			(2,618	)		21,514

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

Net increase (decrease) in cash and cash equivalents		7,133			(81	)		—			—			7,052

Cash and cash equivalents at beginning of period		11,698			2,484			2			—			14,184

Cash and cash equivalents at end of period	$	18,831		$	2,403		$	2		$	—		$	21,236

- 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)	6 Months Ended
Basis Of Presentation (Policies)	Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2017-04 (“ASU 2017-04”), Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendment removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. The guidance is effective for fiscal years beginning after December 15, 2019. The Company does not anticipate that the adoption of ASU 2017-04 will have a material effect on the Company’s consolidated financial statements. In November 2016, the FASB issued Accounting Standard Update No. 2016-18 (“ASU 2016-18”), Statement of Cashflows (Topic 230): Restricted Cash. The amendments require that the statement of cash flows explain the changes during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore amounts generally described as restricted cash or restricted cash equivalents should be included with the cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017. The Company does not anticipate that the adoption of ASU 2016-18 will have a material effect on the Company’s consolidated financial statements. In August 2016, the FASB issued Accounting Standard Update No. 2016-15 (“ASU 2016-15”), Classification of Certain Cash Receipts and Cash Payments, which amends FASB’s standards for reporting cash flows in general-purpose financial statements. The amendments address the diversity in practice related to the classification of certain cash receipts and payments. The guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the impact of ASU 2016-15 on its consolidated financial statements. In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842). The FASB 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 consolidated financial statements. In May 2014, the FASB issued Accounting Standard Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), and subsequently issued other Accounting Standard Updates related to Accounting Standards Codification Topic 606 (collectively, “ASC 606”), which supersede the existing revenue recognition requirements. ASC 606 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. ASC 606 has been deferred to be effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period, which will be our first quarter of fiscal 2018. Early adoption is permitted in fiscal 2017. The Company currently expects to adopt ASC 606 as of January 1, 2018, under the modified retrospective method where the cumulative effect is recognized at the date of initial application. The Company’s evaluation of ASC 606 is ongoing and not complete. The Company is currently evaluating the overall impacts that ASC 606 will have on the methods currently used to measure progress toward completion (which affect the timing of recognition of revenue) and the changes necessitated on our financial systems, existing internal controls and processes to comply with the guidance. The FASB has issued and may issue in the future, interpretative guidance, which may cause the Company’s evaluation to change in future periods prior to adoption. In addition, the ongoing assessment may be impacted by implementation guidance specific to the construction industry. Accordingly, the Company is still evaluating the effect of the adoption of ASC 606 on its consolidated financial statements.

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Computations For Basic And Diluted Loss Per Share

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

	Three Months Ended						Six Months Ended
(shares in thousands)	June 30,						June 30,
	2017			2016			2017			2016

Loss from continuing operations	$	(1,062	)	$	(1,719	)	$	(4,785	)	$	(5,754	)
Income (loss) from discontinued operations, net of income taxes		368			—			(12,697	)		—
Net loss		(694	)		(1,719	)		(17,482	)		(5,754	)

Weighted-average common shares outstanding — basic		61,342			60,711			61,204			60,609
Effect of stock options and restricted stock units		—			—			—			—

Weighted-average common shares outstanding — diluted		61,342			60,711			61,204			60,609

Loss per share from continuing operations — basic	$	(0.02	)	$	(0.03	)	$	(0.08	)	$	(0.10	)
Loss per share from continuing operations — diluted	$	(0.02	)	$	(0.03	)	$	(0.08	)	$	(0.10	)

Accounts Receivable And Contracts In Progress (Tables)

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

Schedule Of Accounts Receivable

Accounts receivable at June 30, 2017 and December 31, 2016 are as follows:

	June 30,			December 31,
	2017			2016
Completed contracts	$	8,953		$	18,727
Contracts in progress		41,267			53,137
Retainage		16,975			21,399
		67,195			93,263
Allowance for doubtful accounts		(763	)		(747	)

Total accounts receivable—net	$	66,432		$	92,516

Current portion of accounts receivable—net	$	61,957		$	88,091
Long-term accounts receivable and retainage		4,475			4,425
Total accounts receivable—net	$	66,432		$	92,516

Components Of Contracts In Progress

The components of contracts in progress at June 30, 2017 and December 31, 2016 are as follows:

	June 30,			December 31,
	2017			2016
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	579,761		$	587,371
Amounts billed		(514,069	)		(511,548	)
Costs and earnings in excess of billings for contracts in progress		65,692			75,823
Costs and earnings in excess of billings for completed contracts		25,138			19,189
Total contract revenues in excess of billings	$	90,830		$	95,012

Billings in excess of costs and earnings:
Amounts billed	$	(325,617	)	$	(268,754	)
Costs and earnings for contracts in progress		320,604			263,613
Total billings in excess of contract revenues	$	(5,013	)	$	(5,141	)

Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2017

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses at June 30, 2017 and December 31, 2016 are as follows:

	June 30,		December 31,
	2017		2016

Insurance	$	15,905	$	18,114
Payroll and employee benefits		6,441		10,028
Interest		3,268		8,660
Accumulated deficit in joint ventures		2,379		17,016
Fuel hedge contracts		1,853		—
Percentage of completion adjustment		1,758		3,322
Income and other taxes		1,592		3,208
Other		7,531		8,695
Total accrued expenses	$	40,727	$	69,043

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,853	$	—	$	1,853	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 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	$	2,293	$	—	$	2,293	$	—

Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location

The fair value of the fuel hedge contracts outstanding as of June 30, 2017 and December 31, 2016 is as follows:

		Fair Value at
		June 30,		December 31,
	Balance Sheet Location	2017		2016
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	—	$	546
Derivatives not designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets		—		1,747
Total asset derivatives		$	—	$	2,293

Liability derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	1,853	$	—

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,
	2017			2016		2017			2016
Cumulative translation adjustments—net of tax	$	6		$	148	$	(22	)	$	557
Derivatives:
Reclassification of derivative losses to earnings—net of tax		155			—		195			—
Change in fair value of derivatives—net of tax		(873	)		—		(1,647	)		—
Net unrealized gain on derivatives—net of tax		(718	)		—		(1,452	)		—
Total other comprehensive income (loss)	$	(712	)	$	148	$	(1,474	)	$	557

Adjustments Reclassified From Accumulated Balances Other Comprehensive Income (Loss) To Earnings

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

		Three Months Ended				Six Months Ended
		June 30,				June 30,
	Statement of Operations Location	2017		2016		2017		2016
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	257	$	—	$	323	$	—
	Income tax benefit		102		—		128		—
		$	155	$	—	$	195	$	—

Business Combinations And Dispositions (Tables)

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Schedule Of Discontinued Operations

The Company estimated its exposure to a surety bond claim, including associated expenses, to be $20,900 and has recorded this amount in discontinued operations during the six months ended June 30, 2017 as follows

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2017		2017

Revenue	$	—	$	—

Loss before income taxes from discontinued operations	$	—	$	(20,900	)
Income tax benefit		368		8,203
Loss from discontinued operations, net of income taxes	$	368	$	(12,697	)

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

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+ Details

Segment Information (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Reporting By Segment

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
Dredging
Contract revenues	$	152,507		$	153,661		$	305,561		$	298,674
Operating income		8,481			10,624			10,587			21,209

Environmental & infrastructure
Contract revenues	$	24,711		$	39,782		$	43,935		$	58,872
Operating loss		(143	)		(6,806	)		(2,873	)		(17,480	)

Intersegment revenues	$	(359	)	$	(1,251	)	$	(2,051	)	$	(2,235	)
Total
Contract revenues	$	176,859		$	192,192		$	347,445		$	355,311
Operating income		8,338			3,818			7,714			3,729

Subsidiary Guarantors (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	12,958		$	68		$	(383	)	$	—		$	12,643
Accounts receivable — net		59,583			3,457			—			(1,083	)		61,957
Contract revenues in excess of billings		87,328			3,502			—			—			90,830
Inventories		35,770			—			—			—			35,770
Prepaid expenses and other current assets		51,554			2,622			23			—			54,199
Total current assets		247,193			9,649			(360	)		(1,083	)		255,399

PROPERTY AND EQUIPMENT—Net		415,509			549			—			—			416,058
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		84,394			385			—			—			84,779
INVENTORIES — Noncurrent		55,460			—			—			—			55,460
INVESTMENTS IN JOINT VENTURES		4,745			49			—			—			4,794
ASSETS HELD FOR SALE—Noncurrent		8,436			555			—			—			8,991
RECEIVABLES FROM AFFILIATES		48,686			17,526			172,294			(238,506	)		—
INVESTMENTS IN SUBSIDIARIES		—			—			540,750			(540,750	)		—
OTHER		8,162			1			5,844			—			14,007
TOTAL	$	872,585		$	28,714		$	718,528		$	(780,339	)	$	839,488

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	77,954		$	672		$	—		$	(1,083	)	$	77,543
Accrued expenses		35,284			1,758			3,685			—			40,727
Billings in excess of contract revenues		5,013			—			—			—			5,013
Current portion of long term debt		1,667			—			1,178			—			2,845
Total current liabilities		119,918			2,430			4,863			(1,083	)		126,128

8% SENIOR NOTES		—			—			320,614			—			320,614
REVOLVING CREDIT FACILITY		—			—			86,000			—			86,000
NOTES PAYABLE		—			—			12,696			—			12,696
DEFERRED INCOME TAXES		(1,833	)		—			57,708			—			55,875
PAYABLES TO AFFILIATES		171,501			61,331			5,674			(238,506	)		—
INVESTMENTS IN SUBSIDIARIES		30,927			—			—			(30,927	)		—
OTHER		7,221			(19	)		175			—			7,377
Total liabilities		327,734			63,742			487,730			(270,516	)		608,690

TOTAL EQUITY		544,851			(35,028	)		230,798			(509,823	)		230,798
TOTAL	$	872,585		$	28,714		$	718,528		$	(780,339	)	$	839,488

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2016
(In thousands)

ASSETS	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation		Eliminations			Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	10,414		$	751		$	2	$	—		$	11,167
Accounts receivable — net		75,412			14,242			—		(1,563	)		88,091
Contract revenues in excess of billings		91,478			3,534			—		—			95,012
Inventories		37,137			—			—		—			37,137
Prepaid expenses and other current assets		73,131			2,688			—		—			75,819
Total current assets		287,572			21,215			2		(1,563	)		307,226

PROPERTY AND EQUIPMENT—Net		407,516			5,492			—		—			413,008
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		84,643			432			—		—			85,075
INVENTORIES — Noncurrent		52,602			—			—		—			52,602
INVESTMENTS IN JOINT VENTURES		4,685			49			—		—			4,734
ASSETS HELD FOR SALE—Noncurrent		8,390			909			—		—			9,299
RECEIVABLES FROM AFFILIATES		58,284			16,807			82,340		(157,431	)		—
INVESTMENTS IN SUBSIDIARIES		—			—			636,216		(636,216	)		—
OTHER		14,692			1			6,951		—			21,644
TOTAL	$	918,384		$	44,905		$	725,509	$	(795,210	)	$	893,588

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	101,795		$	2,879		$	17	$	(1,506	)	$	103,185
Accrued expenses		55,940			3,222			9,881		—			69,043
Billings in excess of contract revenues		4,699			499			—		(57	)		5,141
Current portion of long term debt		305			1,015			1,145		—			2,465
Total current liabilities		162,739			7,615			11,043		(1,563	)		179,834

7 3/8% SENIOR NOTES		—			—			272,998		—			272,998
REVOLVING CREDIT FACILITY		—			—			104,111		—			104,111
NOTE PAYABLE		—			—			13,293		—			13,293
DEFERRED INCOME TAXES		(1,833	)		—			70,282		—			68,449
PAYABLES TO AFFILIATES		80,769			70,921			5,741		(157,431	)		—
INVESTMENTS IN SUBSIDIARIES		32,000			—			—		(32,000	)		—
OTHER		5,925			937			151		—			7,013
Total liabilities		279,600			79,473			477,619		(190,994	)		645,698

TOTAL EQUITY		638,784			(34,568	)		247,890		(604,216	)		247,890
TOTAL	$	918,384		$	44,905		$	725,509	$	(795,210	)	$	893,588

Condensed Consolidating Operations And Comprehensive Income (Loss)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)
FOR THE THREE MONTHS ENDED JUNE 30, 2017
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	174,360		$	3,061		$	—		$	(562	)	$	176,859
Costs of contract revenues		(149,800	)		(1,847	)		—			562			(151,085	)
Gross profit		24,560			1,214			—			—			25,774
OPERATING EXPENSES:
General and administrative expenses		16,848			425			(6	)		—			17,267
(Gain) loss on sale of assets—net		266			(97	)		—			—			169
Operating income		7,446			886			6			—			8,338
Interest expense—net		315			(325	)		(6,431	)		—			(6,441	)
Equity in earnings of subsidiaries		1,644			—			6,569			(8,213	)		—
Equity in loss of joint ventures		(1,468	)		—			—			—			(1,468	)
Loss on extinguishment of debt		—			—			(2,330	)		—			(2,330	)
Other income (expense)		(506	)		221			—			—			(285	)
Income (loss) from continuing operations before income taxes		7,431			782			(2,186	)		(8,213	)		(2,186	)
Income tax benefit		—			—			1,124			—			1,124
Income (loss) from continuing operations		7,431			782			(1,062	)		(8,213	)		(1,062	)
Income from discontinued operations, net of income taxes		—			—			368			—			368
Net income (loss)	$	7,431		$	782		$	(694	)	$	(8,213	)	$	(694	)

Comprehensive income (loss)	$	6,713		$	788		$	(1,406	)	$	(7,501	)	$	(1,406	)

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	177,749		$	15,551		$	—		$	(1,108	)	$	192,192
Costs of contract revenues		(148,127	)		(20,917	)		—			1,108			(167,936	)
Gross profit		29,622			(5,366	)		—			—			24,256
OPERATING EXPENSES:
General and administrative expenses		16,356			3,450			(55	)		—			19,751
(Gain) loss on sale of assets—net		690			(3	)		—			—			687
Operating income (loss)		12,576			(8,813	)		55			—			3,818
Interest expense—net		171			(355	)		(5,719	)		—			(5,903	)
Equity in earnings (loss) of subsidiaries		(7,808	)		—			3,190			4,618			—
Equity in earnings of joint ventures		128			—			—			—			128
Other income (expense)		(526	)		8			—			—			(518	)
Income (loss) before income taxes		4,541			(9,160	)		(2,474	)		4,618			(2,475	)
Income tax benefit		1			—			755			—			756
Net income (loss)	$	4,542		$	(9,160	)	$	(1,719	)	$	4,618		$	(1,719	)

Comprehensive income (loss)	$	4,542		$	(9,012	)	$	(1,571	)	$	4,470		$	(1,571	)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS
FOR THE SIX MONTHS ENDED JUNE 30, 2017
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	344,298		$	4,277		$	—		$	(1,130	)	$	347,445
Costs of contract revenues		(302,340	)		(4,279	)		—			1,130			(305,489	)
Gross profit		41,958			(2	)		—			—			41,956
OPERATING EXPENSES:
General and administrative expenses		33,326			736			—			—			34,062
(Gain) loss on sale of assets—net		260			(80	)		—			—			180
Operating income (loss)		8,372			(658	)		—			—			7,714
Interest expense—net		637			(658	)		(12,002	)		—			(12,023	)
Equity in earnings of subsidiaries		1,041			—			6,135			(7,176	)		—
Equity in loss of joint ventures		(1,467	)		—			—			—			(1,467	)
Loss on extinguishment of debt		—			—			(2,330	)		—			(2,330	)
Other income (expense)		(463	)		386			—			—			(77	)
Income (loss) from continuing operations before income taxes		8,120			(930	)		(8,197	)		(7,176	)		(8,183	)
Income tax (provision) benefit		—			(14	)		3,412			—			3,398
Income (loss) from continuing operations		8,120			(944	)		(4,785	)		(7,176	)		(4,785	)
Loss from discontinued operations, net of income taxes		(20,900	)		—			(12,697	)		20,900			(12,697	)
Net loss	$	(12,780	)	$	(944	)	$	(17,482	)	$	13,724		$	(17,482	)

Comprehensive loss	$	(14,232	)	$	(966	)	$	(18,956	)	$	15,198		$	(18,956	)

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

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

Contract revenues	$	332,328		$	24,628		$	—		$	(1,645	)	$	355,311
Costs of contract revenues		(277,090	)		(35,620	)		—			1,645			(311,065	)
Gross profit		55,238			(10,992	)		—			—			44,246
OPERATING EXPENSES:
General and administrative expenses		32,915			6,980			(55	)		—			39,840
(Gain) loss on sale of assets—net		681			(4	)		—			—			677
Operating income (loss)		21,642			(17,968	)		55			—			3,729
Interest expense—net		368			(733	)		(11,259	)		—			(11,624	)
Equity in earnings (loss) of subsidiaries		(16,781	)		—			2,041			14,740			—
Equity in earnings of joint ventures		13			—			—			—			13
Other expense		(513	)		(768	)		—			—			(1,281	)
Income (loss) before income taxes		4,729			(19,469	)		(9,163	)		14,740			(9,163	)
Income tax benefit		—			—			3,409			—			3,409
Net income (loss)	$	4,729		$	(19,469	)	$	(5,754	)	$	14,740		$	(5,754	)

Comprehensive income (loss)	$	4,729		$	(18,912	)	$	(5,197	)	$	14,183		$	(5,197	)

Condensed Consolidating Statement of Cash Flows

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2017
(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	$	37,010		$	649		$	(16,915	)	$	—		$	20,744
Net cash flows used in operating activities of discontinued operations		(20,900	)		—			—			—			(20,900	)
Cash provided by (used in) operating activities		16,110			649			(16,915	)		—			(156	)

INVESTING ACTIVITIES:
Purchases of property and equipment		(41,828	)		7,562			—			—			(34,266	)
Proceeds from dispositions of property and equipment		1,229			983			—			—			2,212
Changes in restricted cash		7,035			—			—			—			7,035
Net change in accounts with affiliates		10,388			—			(90,635	)		80,247			—
Transfer to parent		—			—			81,000			(81,000	)		—
Cash provided by (used in) investing activities		(23,176	)		8,545			(9,635	)		(753	)		(25,019	)

FINANCING ACTIVITIES:
Proceeds from issuance of 8% senior notes		—			—			325,000			—			325,000
Redemption of 7 3/8% senior notes		—			—			(275,000	)		—			(275,000	)
7 3/8% senior notes tender premium		—			—			(744	)		—			(744	)
Deferred financing fees		—			—			(4,519	)		—			(4,519	)
Repayments of long term note payable		—			—			(567	)		—			(567	)
Proceeds from equipment debt		1,241			—			—			—			1,241
Repayments of equipment debt		(800	)		(19	)		—			—			(819	)
Net change in accounts with affiliates		90,169			(9,922	)		—			(80,247	)		—
Transfer to parent		(81,000	)		—			—			81,000			—
Taxes paid on settlement of vested share awards		—			—			(328	)		—			(328	)
Exercise of options and purchases from employee stock plans		—			—			434			—			434
Borrowings under revolving loans		—			—			52,046			—			52,046
Repayments of revolving loans		—			—			(70,157	)		—			(70,157	)
Cash provided by (used in) financing activities		9,610			(9,941	)		26,165			753			26,587

Effect of foreign currency exchange rates on cash and cash equivalents		—			64			—			—			64

Net increase (decrease) in cash and cash equivalents		2,544			(683	)		(385	)		—			1,476

Cash and cash equivalents at beginning of period		10,414			751			2			—			11,167

Cash and cash equivalents at end of period	$	12,958		$	68		$	(383	)	$	—		$	12,643

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	$	23,152		$	(5,974	)	$	(9,918	)	$	—		$	7,260

INVESTING ACTIVITIES:
Purchases of property and equipment		(32,129	)		(21	)		—			—			(32,150	)
Proceeds from dispositions of property and equipment		10,289			29			—			—			10,318
Net change in accounts with affiliates		(2,618	)		—			—			2,618			—
Cash provided by (used in) investing activities		(24,458	)		8			—			2,618			(21,832	)

FINANCING ACTIVITIES:
Repayments of long term note payable		—			—			(531	)		—			(531	)
Repayments of term loan facility		—			—			(2,500	)		—			(2,500	)
Repayment of equipment debt		(146	)		(562	)		—			—			(708	)
Net change in accounts with affiliates		31,585			6,337			(35,304	)		(2,618	)		—
Transfer to parent		(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	)
Cash provided by (used in) financing activities		8,439			5,775			9,918			(2,618	)		21,514

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

Net increase (decrease) in cash and cash equivalents		7,133			(81	)		—			—			7,052

Cash and cash equivalents at beginning of period		11,698			2,484			2			—			14,184

Cash and cash equivalents at end of period	$	18,831		$	2,403		$	2		$	—		$	21,236

Basis Of Presentation (Narrative) (Details)	6 Months Ended
Basis Of Presentation (Narrative) (Details)	Jun. 30, 2017 segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Average equipment-related costs of total costs of contract revenue	23.00%
Number of operating Segments	2
Number of reportable segments	2
Number of reportable segments with goodwill	3

Earnings Per Share (Narrative) (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	1,331	1,603	1,455	1,694
Securities excluded from computation of earnings per share amount due to loss	603	651	654	523

Earnings Per Share - (Computations For Basic And Diluted Loss Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Loss from continuing operations	$ (1,062)	$ (1,719)	$ (4,785)	$ (5,754)
Income (loss) from discontinued operations, net of income taxes	368		(12,697)
Net loss	$ (694)	$ (1,719)	$ (17,482)	$ (5,754)
Weighted-average common shares outstanding — basic	61,342	60,711	61,204	60,609
Weighted-average common shares outstanding — diluted	61,342	60,711	61,204	60,609
Loss per share from continuing operations — basic	$ (0.02)	$ (0.03)	$ (0.08)	$ (0.10)
Loss per share from continuing operations — diluted	$ (0.02)	$ (0.03)	$ (0.08)	$ (0.10)

- 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

- Definition

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

+ References + Details

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Completed contracts	$ 8,953	$ 18,727
Contracts in progress	41,267	53,137
Retainage	16,975	21,399
Accounts receivable, gross	67,195	93,263
Allowance for doubtful accounts	(763)	(747)
Total accounts receivable—net	66,432	92,516
Current portion of accounts receivable—net	61,957	88,091
Long-term accounts receivable and retainage	$ 4,475	$ 4,425

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 65,692	$ 75,823
Costs and earnings in excess of billings for completed contracts	25,138	19,189
Total contract revenues in excess of billings	90,830	95,012
Total billings in excess of contract revenues	(5,013)	(5,141)
Costs And Earnings In Excess Of Billings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	579,761	587,371
Amounts billed	(514,069)	(511,548)
Billings In Excess Of Costs And Earnings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	320,604	263,613
Amounts billed	$ (325,617)	$ (268,754)

Accounts Receivable And Contracts In Progress (Narrative) (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Receivables [Abstract]
Costs in excess of billings	$ 17,860

Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Insurance	$ 15,905	$ 18,114
Payroll and employee benefits	6,441	10,028
Interest	3,268	8,660
Accumulated deficit in joint ventures	2,379	17,016
Fuel hedge contracts	1,853
Percentage of completion adjustment	1,758	3,322
Income and other taxes	1,592	3,208
Other	7,531	8,695
Total accrued expenses	$ 40,727	$ 69,043

Long-Term Debt (Narrative) (Details) - USD ($)		1 Months Ended	6 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Dec. 30, 2016	May 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Revolving credit facility			$ 86,000,000
Letters of credit outstanding			40,427,000
Letter of credit remaining borrowing capacity			98,999,000
Long-term debt, current maturities			2,845,000	$ 2,465,000
Senior Notes [Member]
Debt Instrument [Line Items]
Face value of senior notes issued, percentage		100.00%
Net proceeds from issuance		$ 321,653,000
Vessels and Ancillary Equipment [Member]
Debt Instrument [Line Items]
Long-term debt, current maturities			2,845,000
Long-term debt, excluding current Maturities			$ 14,149,000
8.000% Senior Notes Due in 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 325,000,000
Debt instrument, interest rate, stated percentage		8.00%	8.00%	8.00%
Maturity date		May 15, 2022
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%	7.375%	7.375%
Maturity date		Feb. 01, 2019
Redemption of notes		$ 282,638,000
Maximum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.10%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000
Line of credit facility optional increase capacity	$ 100,000,000
Revolving credit facility, maturity date			Dec. 30, 2019
Revolving credit facility, description			The Credit Agreement matures on December 30, 2019.
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Revolving Credit Facility [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Unused fee percentage	0.375%
Revolving Credit Facility [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Revolving Credit Facility [Member] \| Maximum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Unused fee percentage	0.25%
Revolving Credit Facility [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Revolving Credit Facility [Member] \| Minimum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	25,000,000
Prior Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Repayments of lines of credit	$ 199,000,000
Prior Revolving Credit Agreement [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Prior Revolving Credit Agreement [Member] \| Maximum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Prior Revolving Credit Agreement [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Prior Revolving Credit Agreement [Member] \| Minimum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Prior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Payment of secured term loan	$ 50,000,000
Term loan facility bear interest fixed rate	4.655%

Fair Value Measurements (Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date) (Details) - Fuel Hedge Contracts [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,853	$ 2,293
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,853	$ 2,293

Fair Value Measurements (Narrative) (Details) gal in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2017 USD ($)	Jun. 30, 2017 USD ($) $ / gal	Jun. 30, 2017 USD ($) $ / gal gal	Dec. 31, 2016 USD ($)
Derivatives Fair Value [Line Items]
Derivative underlying hedge percent			80.00%
Derivative, Nonmonetary Notional Amount, Volume \| gal			9.9
Fair value hedge assets				$ 2,293,000
Fair value hedge liabilities		$ 1,853,000	$ 1,853,000
Reclassification of derivative losses to earnings-net of tax		$ (155,000)	$ (195,000)
8.000% Senior Notes Due in 2022 [Member]
Derivatives Fair Value [Line Items]
Debt instrument, face amount	$ 325,000,000
Stated interest rate	8.00%	8.00%	8.00%	8.00%
Maturity date	May 15, 2022
8.000% Senior Notes Due in 2022 [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivatives Fair Value [Line Items]
Fair value of debt		$ 331,110,000	$ 331,110,000
Minimum [Member]
Derivatives Fair Value [Line Items]
Fixed price range \| $ / gal		1.53	1.53
Maximum [Member]
Derivatives Fair Value [Line Items]
Fixed price range \| $ / gal		1.76	1.76

Fair Value Measurements (Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Asset derivatives		$ 2,293
Prepaid Expenses and Other Current Assets [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Asset derivatives		546
Prepaid Expenses and Other Current Assets [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Asset derivatives		$ 1,747
Accrued Expenses [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Liability derivatives	$ 1,853

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

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Cumulative translation adjustments—net of tax

^[1]

$ 6

$ 148

$ (22)

$ 557

Reclassification of derivative losses to earnings—net of tax

155

195

Change in fair value of derivatives—net of tax

(873)

(1,647)

Net unrealized gain on derivatives—net of tax

^[2]

(718)

(1,452)

Other comprehensive income (loss)—net of tax

$ (712)

$ 148

$ (1,474)

$ 557

[1]	Net of income tax provision of $6 and $99 for the three months ended June 30, 2017 and 2016, respectively. Net of income tax (provision) benefit of $33 and $(370) for the six months ended June 30, 2017 and 2016, respectively.
[2]	Net of income tax provision of $468 and $947 for the three and six months ended June 30, 2017.

Fair Value Measurements (Adjustments Reclassified From Accumulated Balances Other Comprehensive Income (Loss) To Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	$ (151,085)	$ (167,936)	$ (305,489)	$ (311,065)
Income tax benefit	(1,124)	(756)	(3,398)	(3,409)
Net income (loss)	694	$ 1,719	17,482	$ 5,754
Fuel Hedge Contracts [Member] \| Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges \| Reclassification Out Of Accumulated Other Comprehensive Income
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	257		323
Income tax benefit	102		128
Net income (loss)	$ 155		$ 195

Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	May 11, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units				920
Share-based compensation expense		$ 840	$ 1,079	$ 1,758	$ 2,006
Employees And Directors [Member] \| 2017 Long-Term Incentive Plan [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	3,300
Employees And Directors [Member] \| 2007 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Underlying equity awards issued	1,700

Commitments And Contingencies (Narrative) (Details) - USD ($)			6 Months Ended
	Feb. 28, 2017	Jan. 14, 2015	Jun. 30, 2017	May 31, 2017
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 1,083,982,000
Revenue value remaining from outstanding performance bonds			347,860,000
Proceeds from Legal Settlements		$ 5,309,000
Surety Bond [Member]
Commitments And Contingencies [Line Items]
Aggregate demolition surety performance bond	$ 20,000,000
Letter of Credit [Member]
Commitments And Contingencies [Line Items]
Line of credit, borrowing capacity				$ 20,881,000
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
Environmental And Infrastructure Segment [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 41,260,000

Investments (Details) - USD ($) $ in Thousands	3 Months Ended
Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]
Prepaid expenses and other current assets	$ 54,199	$ 75,819
Accumulated deficit in joint ventures	$ 2,379	17,016
TerraSea Environmental Solutions [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Prepaid expenses and other current assets	$ 4,758	24,696
Accumulated deficit in joint ventures	2,379	$ 17,016
Loss from joint venture	$ 1,458

Business Combinations And Dispositions (Narrative) (Details) - USD ($) $ in Thousands				6 Months Ended
	Feb. 28, 2017	Nov. 04, 2014	Apr. 23, 2014	Jun. 30, 2017	Dec. 31, 2015
Business Acquisition [Line Items]
Estimated surety bond claim, including associated expenses				$ 20,900
Great Lakes Environmental & Infrastructure, LLC [Member]
Business Acquisition [Line Items]
Maximum potential aggregate earnout payment		$ 11,400
Magnus Pacific Acquisition [Member]
Business Acquisition [Line Items]
Base purchase price		40,000
Payments for previous acquisition		$ 25,000
Magnus Pacific Acquisition [Member] \| 5.75% Senior Notes Due In 2023 [Member]
Business Acquisition [Line Items]
Fair value of debt					$ 0
Surety Bond [Member]
Business Acquisition [Line Items]
Aggregate demolition surety performance bond	$ 20,000
NASDI, LLC and Yankee Environmental Services, LLC
Business Acquisition [Line Items]
Proceeds from divestiture of businesses			$ 5,309

Business Combinations And Dispositions - (Schedule Of Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Business Combinations [Abstract]
Loss before income taxes from discontinued operations		$ (20,900)
Income tax benefit	$ 368	8,203
Loss from discontinued operations, net of income taxes	$ 368	$ (12,697)

- Definition

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

+ References + Details

- Definition

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

+ References + Details

- Definition

+ References + Details

Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Narrative) (Details) $ in Thousands	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			2
Contract revenues	$ 176,859	$ 192,192	$ 347,445	$ 355,311
Dredging Segment [Member] \| Foreign [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 12,420	$ 11,683	$ 31,574	$ 13,192

Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Contract revenues	$ 176,859	$ 192,192	$ 347,445	$ 355,311
Operating income (loss)	8,338	3,818	7,714	3,729
Dredging Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	8,481	10,624	10,587	21,209
Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(143)	(6,806)	(2,873)	(17,480)
Operating Segment [Member] \| Dredging Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	152,507	153,661	305,561	298,674
Operating Segment [Member] \| Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	24,711	39,782	43,935	58,872
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ (359)	$ (1,251)	$ (2,051)	$ (2,235)

Subsidiary Guarantors (Narrative) (Details) - 8% SENIOR NOTES [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Condensed Financial Statements, Captions [Line Items]
SENIOR NOTES	$ 325,000
Debt instrument, interest rate, stated percentage	8.00%
Maturity date	May 15, 2022
Owned Domestic Subsidiaries Percent	100.00%

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 12,643	$ 11,167	$ 21,236	$ 14,184
Accounts receivable—net	61,957	88,091
Contract revenues in excess of billings	90,830	95,012
Inventories	35,770	37,137
Prepaid expenses and other current assets	54,199	75,819
Total current assets	255,399	307,226
PROPERTY AND EQUIPMENT—Net	416,058	413,008
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,779	85,075
INVENTORIES—Noncurrent	55,460	52,602
INVESTMENTS IN JOINT VENTURES	4,794	4,734
ASSETS HELD FOR SALE—Noncurrent	8,991	9,299
OTHER	14,007	21,644
TOTAL	839,488	893,588
LIABILITIES AND EQUITY
Accounts payable	77,543	103,185
Accrued expenses	40,727	69,043
Billings in excess of contract revenues	5,013	5,141
Current portion of long term debt	2,845	2,465
Total current liabilities	126,128	179,834
REVOLVING CREDIT FACILITY	86,000	104,111
NOTES PAYABLE	12,696	13,293
DEFERRED INCOME TAXES	55,875	68,449
OTHER	7,377	7,013
Total liabilities	608,690	645,698
TOTAL EQUITY	230,798	247,890	249,235	252,173
TOTAL	839,488	893,588
8% SENIOR NOTES [Member]
LIABILITIES AND EQUITY
SENIOR NOTES	320,614
7 3/8% SENIOR NOTES [Member]
LIABILITIES AND EQUITY
SENIOR NOTES		272,998
Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	12,958	10,414	18,831	11,698
Accounts receivable—net	59,583	75,412
Contract revenues in excess of billings	87,328	91,478
Inventories	35,770	37,137
Prepaid expenses and other current assets	51,554	73,131
Total current assets	247,193	287,572
PROPERTY AND EQUIPMENT—Net	415,509	407,516
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,394	84,643
INVENTORIES—Noncurrent	55,460	52,602
INVESTMENTS IN JOINT VENTURES	4,745	4,685
ASSETS HELD FOR SALE—Noncurrent	8,436	8,390
RECEIVABLES FROM AFFILIATES	48,686	58,284
OTHER	8,162	14,692
TOTAL	872,585	918,384
LIABILITIES AND EQUITY
Accounts payable	77,954	101,795
Accrued expenses	35,284	55,940
Billings in excess of contract revenues	5,013	4,699
Current portion of long term debt	1,667	305
Total current liabilities	119,918	162,739
DEFERRED INCOME TAXES	1,833	1,833
PAYABLES TO AFFILIATES	171,501	80,769
INVESTMENTS IN SUBSIDIARIES	30,927	32,000
OTHER	7,221	5,925
Total liabilities	327,734	279,600
TOTAL EQUITY	544,851	638,784
TOTAL	872,585	918,384
Reportable Legal Entities [Member] \| Non Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	68	751	2,403	2,484
Accounts receivable—net	3,457	14,242
Contract revenues in excess of billings	3,502	3,534
Prepaid expenses and other current assets	2,622	2,688
Total current assets	9,649	21,215
PROPERTY AND EQUIPMENT—Net	549	5,492
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	385	432
INVESTMENTS IN JOINT VENTURES	49	49
ASSETS HELD FOR SALE—Noncurrent	555	909
RECEIVABLES FROM AFFILIATES	17,526	16,807
OTHER	1	1
TOTAL	28,714	44,905
LIABILITIES AND EQUITY
Accounts payable	672	2,879
Accrued expenses	1,758	3,222
Billings in excess of contract revenues		499
Current portion of long term debt		1,015
Total current liabilities	2,430	7,615
PAYABLES TO AFFILIATES	61,331	70,921
OTHER	(19)	937
Total liabilities	63,742	79,473
TOTAL EQUITY	(35,028)	(34,568)
TOTAL	28,714	44,905
Reportable Legal Entities [Member] \| GLDD Corporation [Member]
CURRENT ASSETS:
Cash and cash equivalents	(383)	2	$ 2	$ 2
Prepaid expenses and other current assets	23
Total current assets	(360)	2
RECEIVABLES FROM AFFILIATES	172,294	82,340
INVESTMENTS IN SUBSIDIARIES	540,750	636,216
OTHER	5,844	6,951
TOTAL	718,528	725,509
LIABILITIES AND EQUITY
Accounts payable		17
Accrued expenses	3,685	9,881
Current portion of long term debt	1,178	1,145
Total current liabilities	4,863	11,043
REVOLVING CREDIT FACILITY	86,000	104,111
NOTES PAYABLE	12,696	13,293
DEFERRED INCOME TAXES	57,708	70,282
PAYABLES TO AFFILIATES	5,674	5,741
OTHER	175	151
Total liabilities	487,730	477,619
TOTAL EQUITY	230,798	247,890
TOTAL	718,528	725,509
Reportable Legal Entities [Member] \| 8% SENIOR NOTES [Member] \| GLDD Corporation [Member]
LIABILITIES AND EQUITY
SENIOR NOTES	320,614
Reportable Legal Entities [Member] \| 7 3/8% SENIOR NOTES [Member] \| GLDD Corporation [Member]
LIABILITIES AND EQUITY
SENIOR NOTES		272,998
Consolidation Eliminations [Member]
CURRENT ASSETS:
Accounts receivable—net	(1,083)	(1,563)
Total current assets	(1,083)	(1,563)
RECEIVABLES FROM AFFILIATES	(238,506)	(157,431)
INVESTMENTS IN SUBSIDIARIES	(540,750)	(636,216)
TOTAL	(780,339)	(795,210)
LIABILITIES AND EQUITY
Accounts payable	(1,083)	(1,506)
Billings in excess of contract revenues		(57)
Total current liabilities	(1,083)	(1,563)
PAYABLES TO AFFILIATES	(238,506)	(157,431)
INVESTMENTS IN SUBSIDIARIES	(30,927)	(32,000)
Total liabilities	(270,516)	(190,994)
TOTAL EQUITY	(509,823)	(604,216)
TOTAL	$ (780,339)	$ (795,210)

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 176,859	$ 192,192	$ 347,445	$ 355,311
Costs of contract revenues	(151,085)	(167,936)	(305,489)	(311,065)
Gross profit	25,774	24,256	41,956	44,246
General and administrative expenses	17,267	19,751	34,062	39,840
Loss on sale of assets	169	687	180	677
Operating income	8,338	3,818	7,714	3,729
Interest expense—net	(6,441)	(5,903)	(12,023)	(11,624)
Equity in earnings (loss) of joint ventures	(1,468)	128	(1,467)	13
Loss on extinguishment of debt	(2,330)		(2,330)
Other income (expense)	(285)	(518)	(77)	(1,281)
Loss from continuing operations before income taxes	(2,186)	(2,475)	(8,183)	(9,163)
Income tax (provision) benefit	1,124	756	3,398	3,409
Loss from continuing operations	(1,062)	(1,719)	(4,785)	(5,754)
Income (loss) from discontinued operations, net of income taxes	368		(12,697)
Net loss	(694)	(1,719)	(17,482)	(5,754)
Comprehensive income (loss)	(1,406)	(1,571)	(18,956)	(5,197)
Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	174,360	177,749	344,298	332,328
Costs of contract revenues	(149,800)	(148,127)	(302,340)	(277,090)
Gross profit	24,560	29,622	41,958	55,238
General and administrative expenses	16,848	16,356	33,326	32,915
Loss on sale of assets	266	690	260	681
Operating income	7,446	12,576	8,372	21,642
Interest expense—net	315	171	637	368
Equity in earnings (loss) of subsidiaries	1,644	(7,808)	1,041	(16,781)
Equity in earnings (loss) of joint ventures	(1,468)	128	(1,467)	13
Other income (expense)	(506)	(526)	(463)	(513)
Loss from continuing operations before income taxes	7,431	4,541	8,120	4,729
Income tax (provision) benefit		1
Loss from continuing operations	7,431		8,120
Income (loss) from discontinued operations, net of income taxes			(20,900)
Net loss	7,431	4,542	(12,780)	4,729
Comprehensive income (loss)	6,713	4,542	(14,232)	4,729
Reportable Legal Entities [Member] \| Non Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	3,061	15,551	4,277	24,628
Costs of contract revenues	(1,847)	(20,917)	(4,279)	(35,620)
Gross profit	1,214	(5,366)	(2)	(10,992)
General and administrative expenses	425	3,450	736	6,980
Loss on sale of assets	(97)	(3)	(80)	(4)
Operating income	886	(8,813)	(658)	(17,968)
Interest expense—net	(325)	(355)	(658)	(733)
Other income (expense)	221	8	386	(768)
Loss from continuing operations before income taxes	782	(9,160)	(930)	(19,469)
Income tax (provision) benefit			(14)
Loss from continuing operations	782		(944)
Net loss	782	(9,160)	(944)	(19,469)
Comprehensive income (loss)	788	(9,012)	(966)	(18,912)
Reportable Legal Entities [Member] \| GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
General and administrative expenses	(6)	(55)		(55)
Operating income	6	55		55
Interest expense—net	(6,431)	(5,719)	(12,002)	(11,259)
Equity in earnings (loss) of subsidiaries	6,569	3,190	6,135	2,041
Loss on extinguishment of debt	(2,330)		(2,330)
Loss from continuing operations before income taxes	(2,186)	(2,474)	(8,197)	(9,163)
Income tax (provision) benefit	1,124	755	3,412	3,409
Loss from continuing operations	(1,062)		(4,785)
Income (loss) from discontinued operations, net of income taxes	368		(12,697)
Net loss	(694)	(1,719)	(17,482)	(5,754)
Comprehensive income (loss)	(1,406)	(1,571)	(18,956)	(5,197)
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(562)	(1,108)	(1,130)	(1,645)
Costs of contract revenues	562	1,108	1,130	1,645
Equity in earnings (loss) of subsidiaries	(8,213)	4,618	(7,176)	14,740
Loss from continuing operations before income taxes	(8,213)	4,618	(7,176)	14,740
Loss from continuing operations	(8,213)		(7,176)
Income (loss) from discontinued operations, net of income taxes			20,900
Net loss	(8,213)	4,618	13,724	14,740
Comprehensive income (loss)	$ (7,501)	$ 4,470	$ 15,198	$ 14,183

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	$ 20,744	$ 7,260
Net cash flows used in operating activities of discontinued operations	(20,900)
Cash provided by (used in) operating activities	(156)	7,260
INVESTING ACTIVITIES:
Purchases of property and equipment	(34,266)	(32,150)
Proceeds from dispositions of property and equipment	2,212	10,318
Changes in restricted cash	7,035
Cash used in investing activities	(25,019)	(21,832)
FINANCING ACTIVITIES:
Proceeds from issuance of 8% senior notes	325,000
Redemption of 7 3/8% senior notes	(275,000)
7 3/8% senior notes tender premium	(744)
Deferred financing fees	(4,519)
Repayments of long term note payable	(567)	(531)
Proceeds from equipment debt	1,241
Repayments of term loan facility		(2,500)
Repayments of equipment debt	(819)	(708)
Taxes paid on settlement of vested share awards	(328)	(162)
Exercise of options and purchases from employee stock plans	434	415
Borrowings under revolving loans	52,046	91,500
Repayments of revolving loans	(70,157)	(66,500)
Cash provided by financing activities	26,587	21,514
Effect of foreign currency exchange rates on cash and cash equivalents	64	110
Net increase in cash and cash equivalents	1,476	7,052
Cash and cash equivalents at beginning of period	11,167	14,184
Cash and cash equivalents at end of period	12,643	21,236
Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	37,010
Net cash flows used in operating activities of discontinued operations	(20,900)
Cash provided by (used in) operating activities	16,110	23,152
INVESTING ACTIVITIES:
Purchases of property and equipment	(41,828)	(32,129)
Proceeds from dispositions of property and equipment	1,229	10,289
Changes in restricted cash	7,035
Net change in accounts with affiliates	10,388	(2,618)
Cash used in investing activities	(23,176)	(24,458)
FINANCING ACTIVITIES:
Proceeds from equipment debt	1,241
Repayments of equipment debt	(800)	(146)
Net change in accounts with affiliates	90,169	31,585
Transfer to parent	(81,000)	(23,000)
Cash provided by financing activities	9,610	8,439
Net increase in cash and cash equivalents	2,544	7,133
Cash and cash equivalents at beginning of period	10,414	11,698
Cash and cash equivalents at end of period	12,958	18,831
Reportable Legal Entities [Member] \| Non Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	649
Cash provided by (used in) operating activities	649	(5,974)
INVESTING ACTIVITIES:
Purchases of property and equipment	(7,562)	(21)
Proceeds from dispositions of property and equipment	983	29
Cash used in investing activities	8,545	8
FINANCING ACTIVITIES:
Repayments of equipment debt	(19)	(562)
Net change in accounts with affiliates	(9,922)	6,337
Cash provided by financing activities	(9,941)	5,775
Effect of foreign currency exchange rates on cash and cash equivalents	64	110
Net increase in cash and cash equivalents	(683)	(81)
Cash and cash equivalents at beginning of period	751	2,484
Cash and cash equivalents at end of period	68	2,403
Reportable Legal Entities [Member] \| GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities of continuing operations	(16,915)
Cash provided by (used in) operating activities	(16,915)	(9,918)
INVESTING ACTIVITIES:
Net change in accounts with affiliates	(90,635)
Transfer to parent	81,000
Cash used in investing activities	(9,635)
FINANCING ACTIVITIES:
Proceeds from issuance of 8% senior notes	325,000
Redemption of 7 3/8% senior notes	(275,000)
7 3/8% senior notes tender premium	(744)
Deferred financing fees	(4,519)
Repayments of long term note payable	(567)	(531)
Repayments of term loan facility		(2,500)
Net change in accounts with affiliates		(35,304)
Transfer to parent		23,000
Taxes paid on settlement of vested share awards	(328)	(162)
Exercise of options and purchases from employee stock plans	434	415
Borrowings under revolving loans	52,046	91,500
Repayments of revolving loans	(70,157)	(66,500)
Cash provided by financing activities	26,165	9,918
Net increase in cash and cash equivalents	(385)
Cash and cash equivalents at beginning of period	2	2
Cash and cash equivalents at end of period	(383)	2
Consolidation Eliminations [Member]
INVESTING ACTIVITIES:
Net change in accounts with affiliates	80,247	2,618
Transfer to parent	(81,000)
Cash used in investing activities	(753)	2,618
FINANCING ACTIVITIES:
Net change in accounts with affiliates	(80,247)	(2,618)
Transfer to parent	81,000
Cash provided by financing activities	$ 753	$ (2,618)