10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2018

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                  to                 

Commission file number: 001-33225

Great Lakes Dredge & Dock Corporation

(Exact name of registrant as specified in its charter)

Delaware	20-5336063
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
2122 York Road, Oak Brook, IL	60523
(Address of principal executive offices)	(Zip Code)

(630) 574-3000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer	☐	Accelerated Filer	☒
Non-Accelerated Filer	☐ (Do not check if a smaller reporting company)	Smaller reporting company	☐
Emerging Growth Company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

As of July 27, 2018, 62,305,408 shares of the Registrant’s Common Stock, par value $.0001 per share, were outstanding.

Great Lakes Dredge & Dock Corporation and Subsidiaries

Quarterly Report Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

For the Quarterly Period ended June 30, 2018

INDEX

		Page
	Part I Financial Information (Unaudited)	3
Item 1	Financial Statements	3
	Condensed Consolidated Balance Sheets at June 30, 2018 and December 31, 2017	3
	Condensed Consolidated Statements of Operations for the Three and Six Months ended June 30, 2018 and 2017	4
	Condensed Consolidated Statements of Comprehensive Loss for the Three and Six Months ended June 30, 2018 and 2017	5
	Condensed Consolidated Statements of Equity for the Six Months Ended June 30, 2018 and 2017	6
	Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2018 and 2017	7
	Notes to Condensed Consolidated Financial Statements	9
Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	22
Item 3	Quantitative and Qualitative Disclosures About Market Risk	33
Item 4	Controls and Procedures	33
	Part II Other Information	34
Item 1	Legal Proceedings	34
Item 1A	Risk Factors	34
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	34
Item 3	Defaults Upon Senior Securities	34
Item 4	Mine Safety Disclosures	34
Item 5	Other Information	34
Item 6	Exhibits	35
	Signature	36

2

PART I — Financial Information

Item 1. Financial Statements.

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

Condensed Consolidated Balance Sheets

(Unaudited)

(in thousands, except per share amounts)  

	June 30,			December 31,
	2018			2017
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	13,538		$	15,852
Accounts receivable—net		82,306			75,533
Contract revenues in excess of billings		55,003			90,788
Inventories		32,340			34,600
Prepaid expenses and other current assets		40,947			45,411
Total current assets		224,134			262,184
PROPERTY AND EQUIPMENT—Net		371,807			407,294
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		84,186			84,484
INVENTORIES—Noncurrent		55,200			54,023
INVESTMENTS IN JOINT VENTURES		3,489			2,714
ASSETS HELD FOR SALE—Noncurrent		6,916			8,530
OTHER		12,473			13,128
TOTAL	$	758,205		$	832,357
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	68,751		$	87,659
Accrued expenses		45,943			56,218
Billings in excess of contract revenues		9,050			3,615
Current portion of long-term debt		1,169			2,758
Total current liabilities		124,913			150,250
LONG-TERM DEBT		321,503			333,141
REVOLVING CREDIT FACILITY		70,882			95,000
DEFERRED INCOME TAXES		21,896			25,561
OTHER		7,497			7,109
Total liabilities		546,691			611,061
COMMITMENTS AND CONTINGENCIES (Note 9)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 62,583 and 61,897 shares issued; 62,305 and 61,619 shares outstanding at June 30, 2018 and December 31, 2017, respectively.		6			6
Treasury stock, at cost		(1,433	)		(1,433	)
Additional paid-in capital		291,468			289,821
Accumulated deficit		(78,973	)		(67,101	)
Accumulated other comprehensive income		446			3
Total equity		211,514			221,296
TOTAL	$	758,205		$	832,357

See notes to unaudited condensed consolidated financial statements.

3

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Operations

(Unaudited)

(in thousands, except per share amounts)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Contract revenues	$	150,590		$	176,859		$	297,183		$	347,445
Costs of contract revenues		128,350			156,577			260,238			312,351
Gross profit		22,240			20,282			36,945			35,094
General and administrative expenses		15,169			17,267			31,113			34,062
(Gain) loss on sale of assets—net		(1,063	)		169			(1,262	)		180
Operating income		8,134			2,846			7,094			852
Interest expense—net		(8,997	)		(6,441	)		(17,657	)		(12,023	)
Equity in loss of joint ventures		—			(1,468	)		—			(1,467	)
Loss on extinguishment of debt		—			(2,330	)		—			(2,330	)
Other expense		(57	)		(285	)		(2,973	)		(77	)
Loss from continuing operations before income taxes		(920	)		(7,678	)		(13,536	)		(15,045	)
Income tax (provision) benefit		(54	)		3,454			3,241			6,247
Loss from continuing operations		(974	)		(4,224	)		(10,295	)		(8,798	)
Income (loss) from discontinued operations, net of income taxes		—			368			—			(12,697	)
Net loss	$	(974	)	$	(3,856	)	$	(10,295	)	$	(21,495	)
Basic loss per share attributable to continuing operations	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)
Basic loss per share attributable to discontinued operations, net of tax		—			—			—			(0.21	)
Basic loss per share	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.35	)
Basic weighted average shares		62,267			61,342			62,041			61,204
Diluted loss per share attributable to continuing operations	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)
Diluted loss per share attributable to discontinued operations, net of tax		—			—			—			(0.21	)
Diluted loss per share	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.35	)
Diluted weighted average shares		62,267			61,342			62,041			61,204

See notes to unaudited condensed consolidated financial statements.

4

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Comprehensive Loss

(Unaudited)

(in thousands)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Net loss	$	(974	)	$	(3,856	)	$	(10,295	)	$	(21,495	)
Currency translation adjustment—net of tax (1)		(57	)		6			1,304			(22	)
Net unrealized gain on derivatives—net of tax (2)		(127	)		(718	)		(861	)		(1,452	)
Other comprehensive income (loss)—net of tax		(184	)		(712	)		443			(1,474	)
Comprehensive loss	$	(1,158	)	$	(4,568	)	$	(9,852	)	$	(22,969	)

(1) Net of income tax (provision) benefit of $5 and $(6) for the three months ended June 30, 2018 and 2017, respectively. Net of income tax (provision) benefit of $(530) and $33 for the six months ended June 30, 2018 and 2017, respectively.

(2) Net of income tax provision of $689 and $468 for the three months ended June 30, 2018 and 2017, respectively. Net of income tax provision of $949 and $947 for the six months ended June 30, 2018 and 2017, respectively.

See notes to unaudited condensed consolidated financial statements.

5

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Equity

(Unaudited)

(in thousands)

																	Accumulated
	Sharesof				Shares of						Additional						Other
	Common		Common		Treasury			Treasury			Paid-In			Accumulated			Comprehensive
	Stock		Stock		Stock			Stock			Capital			Deficit			Income (loss)		Total
BALANCE—January 1, 2018		61,897	$	6		(278	)	$	(1,433	)	$	289,821		$	(67,101	)	$	3	$	221,296
Cumulative effect of recent accounting pronouncements		—		—		—			—			—			(1,577	)		—		(1,577	)
Share-based compensation		72		—		—			—			2,264			—			—		2,264
Vesting of restricted stock units, including impact of shares withheld for taxes		486		—		—			—			(1,060	)		—			—		(1,060	)
Exercise of options and purchases from employee stock plans		128		—		—			—			443			—			—		443
Net loss		—		—		—			—			—			(10,295	)		—		(10,295	)
Other comprehensive income—net of tax		—		—		—			—			—			—			443		443
BALANCE—June 30, 2018		62,583	$	6		(278	)	$	(1,433	)	$	291,468		$	(78,973	)	$	446	$	211,514

																	Accumulated
	Shares of				Shares of						Additional						Other
	Common		Common		Treasury			Treasury			Paid-In			Accumulated			Comprehensive
	Stock		Stock		Stock			Stock			Capital			Deficit			Income (loss)			Total
BALANCE—January 1, 2017		61,240	$	6		(278	)	$	(1,433	)	$	286,303		$	(35,841	)	$	(1,145	)	$	247,890
Share-based compensation		164		—		—			—			1,758			—			—			1,758
Vesting of restricted stock units, including impact of shares withheld for taxes		147		—		—			—			(328	)		—			—			(328	)
Exercise of options and purchases from employee stock plans		132		—		—			—			434			—			—			434
Net loss		—		—		—			—			—			(21,495	)		—			(21,495	)
Other comprehensive loss—net of tax		—		—		—			—			—			—			(1,474	)		(1,474	)
BALANCE—June 30, 2017		61,683	$	6		(278	)	$	(1,433	)	$	288,167		$	(57,336	)	$	(2,619	)	$	226,785

See notes to unaudited condensed consolidated financial statements.

6

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(Unaudited)

(in thousands)

	Six Months Ended
	June 30,
	2018			2017
OPERATING ACTIVITIES:
Net loss	$	(10,295	)	$	(21,495	)
Loss from discontinued operations, net of income taxes		—			(12,697	)
Loss from continuing operations	$	(10,295	)	$	(8,798	)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation and amortization		28,981			27,501
Equity in earnings of joint ventures		(1,313	)		(3,087	)
Cash distributions from joint ventures		538			4,486
Loss on extinguishment of 7 3/8% senior notes		—			2,330
Deferred income taxes		(2,850	)		(6,277	)
(Gain) loss on sale of assets		(1,262	)		180
Other non-cash restructuring items		2,015			—
Amortization of deferred financing fees		1,769			1,646
Unrealized net loss from mark-to-market valuations of derivatives		—			1,089
Unrealized foreign currency gain		(201	)		(115	)
Share-based compensation expense		2,264			1,758
Changes in assets and liabilities:
Accounts receivable		(2,297	)		26,126
Contract revenues in excess of billings		32,823			4,212
Inventories		1,083			(1,536	)
Prepaid expenses and other current assets		11,361			6,169
Accounts payable and accrued expenses		(30,348	)		(34,498	)
Billings in excess of contract revenues		(2,249	)		51
Other noncurrent assets and liabilities		(4,743	)		1,379
Net cash flows provided by operating activities from continuing operations		25,276			22,616
Net cash flows used in operating activities of discontinued operations		—			(20,900	)
Cash provided by operating activities		25,276			1,716
INVESTING ACTIVITIES:
Purchases of property and equipment		(11,790	)		(34,266	)
Proceeds from dispositions of property and equipment		9,979			2,212
Cash used in investing activities		(1,811	)		(32,054	)

7

	Six Months Ended
	June 30,
	2018			2017
FINANCING ACTIVITIES:
7 3/8% senior notes tender premium		—			(744	)
Deferred financing fees		—			(4,519	)
Repayments of debt		(1,070	)		(276,386	)
Proceeds from issuance of debt		—			326,241
Taxes paid on settlement of vested share awards		(1,060	)		(328	)
Exercise of options and purchases from employee stock plans		443			434
Borrowings under revolving loans		18,000			52,046
Repayments of revolving loans		(42,118	)		(70,157	)
Cash provided by (used in) financing activities		(25,805	)		26,587
Effect of foreign currency exchange rates on cash and cash equivalents		26			64
Net decrease in cash, cash equivalents and restricted cash		(2,314	)		(3,687	)
Cash, cash equivalents and restricted cash at beginning of period		17,352			19,702
Cash, cash equivalents and restricted cash at end of period	$	15,038		$	16,015
Supplemental Cash Flow Information
Cash paid for interest	$	16,245		$	19,835
Cash paid for income taxes	$	243		$	555
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$	5,220		$	4,578
Repayments of debt with proceeds from sale-leaseback transactions	$	13,034		$	—

See notes to unaudited condensed consolidated financial statements.

8

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(dollar amounts in thousands, except per share amounts or as otherwise noted)

1. Basis of presentation

The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Great Lakes Dredge & Dock Corporation and Subsidiaries (the “Company” or “Great Lakes”) and the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. 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, 2018, and its results of operations for the three and six months ended June 30, 2018 and 2017 and cash flows for the six months ended June 30, 2018 and 2017 have been included.

The Company adopted Accounting Standard Update No. 2016-18 (“ASU 2016-18”), Statement of Cashflows (Topic 230): Restricted Cash on January 1, 2018. 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 impact of the adoption of ASU 2016-18 has been applied retrospectively and the prior period presented has been recast.

The following table provides a reconciliation of cash, cash equivalents and restricted cash at June 30, 2018 and December 31, 2017 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statements of Cash Flows.

	June 30, 2018		December 31, 2017
Cash and cash equivalents	$	13,538	$	15,852
Restricted cash included in other long-term assets		1,500		1,500
Cash, cash equivalents and restricted cash at end of period	$	15,038	$	17,352

Effective beginning the first quarter of 2018, the Company changed the method of accounting for allocated fixed equipment costs for interim periods such that fixed equipment costs are now recognized as incurred. The Company adopted this change as a result of management’s belief that the new method is preferable and results in a more objective measure of quarterly expense that will better support planning and resource allocation decisions by management. The change has been applied retrospectively and all prior interim periods presented have been recast. The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. Previously, the Company allocated fixed equipment costs to interim periods in proportion to revenues recognized over the year. Specifically, at each interim reporting date the Company compared actual revenues earned to date on its dredging contracts to expected annual revenues and recognized 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 impact of the change in accounting policy on our Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets is as follows:

	Three Months Ended			Six Months Ended
	June 30, 2017			June 30, 2017
Costs of contract revenues	$	5,492		$	6,862
Income tax benefit		2,330			2,849
Loss from continuing operations		(3,162	)		(4,013	)
Net loss	$	(3,162	)	$	(4,013	)
Comprehensive loss	$	(3,162	)	$	(4,013	)
Basic loss per share attributable to continuing operations	$	(0.05	)	$	(0.06	)
Diluted loss per share attributable to continuing operations	$	(0.05	)	$	(0.06	)

9

	June 30, 2017
Prepaid expenses and other current assets	$	(6,862	)
Deferred income taxes		(2,849	)
Accumulated deficit	$	(4,013	)

The Company adopted 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”) on January 1, 2018 under the modified retrospective method such that the cumulative effect is recognized at the date of initial application. The adoption of ASC 606 may result in a change in the timing of recognition of both contract revenue and costs from our prior practices. Upon the adoption of ASC 606, the Company recorded a cumulative net adjustment of $1,950 to the beginning retained earnings balance. Refer to Note 7, Revenue, for further discussion of the adoption of ASC 606.

In February 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2018-02 (“ASU 2018-02”), Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The new guidance allows entities to reclassify from accumulated other comprehensive income to retained earnings stranded tax effects resulting from the Tax Cut and Jobs Act. The Company elected to early adopt ASU 2018-02 during the quarter ended March 31, 2018.

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 has two operating segments: dredging and environmental & infrastructure, which are also the Company’s reportable segments and reporting units of which the Company tests goodwill for impairment. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2018.

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 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 February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) and subsequently issued other Accounting Standard Updates related to the Accounting Standards Codification Topic 842 (collectively, “ASC 842”). The FASB issued ASC 842 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’s evaluation of ASC 842 is ongoing and not complete. The Company is currently evaluating the overall impacts that ASC 842 will have on the classification of leases and resulting pattern of expense recognition in the income statement, existing internal controls and processes to comply with the guidance. Accordingly, the Company is still evaluating the effect of the adoption of ASC 842 on its consolidated financial statements.

2. Earnings per share

Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings per share is computed the same as 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.

10

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

	Three Months Ended						Six Months Ended
(shares in thousands)	June 30,						June 30,
	2018			2017			2018			2017
Loss from continuing operations	$	(974	)	$	(4,224	)	$	(10,295	)	$	(8,798	)
Income (loss) from discontinued operations, net of income taxes		—			368			—			(12,697	)
Net loss		(974	)		(3,856	)		(10,295	)		(21,495	)
Weighted-average common shares outstanding — basic		62,267			61,342			62,041			61,204
Effect of stock options and restricted stock units		—			—			—			—
Weighted-average common shares outstanding — diluted		62,267			61,342			62,041			61,204
Loss per share from continuing operations — basic	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)
Loss per share from continuing operations — diluted	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)

For the quarter and year ended June 30, 2018 and 2017, the following stock options and restricted stock units were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during these periods:

	Three Months Ended				Six Months Ended
(shares in thousands)	June 30,				June 30,
	2018		2017		2018		2017
Effect of stock options and restricted stock units		429		603		920		654

For the quarter and year ended June 30, 2018 and 2017, the following stock options and restricted stock units were excluded from the calculation of diluted earnings per share as such stock options and restricted stock units were determined to be anti-dilutive:

	Three Months Ended				Six Months Ended
(shares in thousands)	June 30,				June 30,
	2018		2017		2018		2017
Effect of stock options and restricted stock units		1,495		1,331		1,524		1,455

3. Accrued expenses

Accrued expenses at June 30, 2018 and December 31, 2017 are as follows:

	June 30,		December 31,
	2018		2017
Insurance	$	14,357	$	22,941
Payroll and employee benefits		8,078		8,747
Accrued rent		5,417		6,519
Interest		3,853		4,210
Percentage of completion adjustment		3,302		3,591
Income and other taxes		2,341		2,794
Other		8,595		7,416
Total accrued expenses	$	45,943	$	56,218

4. 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, CIBC Bank USA, Suntrust Robinson Humphrey, Inc., Capital One, National Association

11

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 that no default or event of default exists both before and after giving effect to such incremental commitment increase.

The Credit Agreement also provides for certain actions contemplated in the plan of restructuring with respect to the Company’s 2017 and 2018 fiscal years including allowing up to an aggregate of $20,000 of expenses related to the buy-out of operating leases and allowing capital expenditures planned but not incurred by all Credit Parties in fiscal year 2017 to be carried forward to fiscal year 2018; provided that, the aggregate amount of all capital expenditures incurred by all Credit Parties in fiscal years 2017 and 2018 does not exceed $135,000. Additionally, the Credit Agreement contains acknowledgments and agreements from the Agent and the required lenders with respect to certain EBITDA add-backs for fiscal years 2017 and 2018 described therein. See Note 8, Restructuring charges.

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 Company is required to maintain this ratio if its availability under the Credit Agreement falls below $31,250 for five consecutive days or $25,000 for one day. 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 and 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, 2018, the Company had $70,882 of borrowings on the revolver, $31,587 of letters of credit outstanding and $75,520 of availability under the Credit Agreement. The availability under the Credit Agreement is suppressed by $72,011 as of June 30, 2018 as a result of certain additional limitations set forth in the Credit Agreement.

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Senior Notes and subsidiary guarantors

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.

The Company’s obligations under these Senior Notes are guaranteed by certain of the Company’s 100% owned domestic subsidiaries. Such guarantees are full, unconditional and joint and several. The parent company issuer has no independent assets or operations and all non-guarantor subsidiaries have been determined to be minor.

Other

The Company enters into note arrangements to finance certain vessels and ancillary equipment. The current portion of all equipment notes is $1,169. The long-term portion is $376 and is included in notes payable or other long-term liabilities. In February 2018, the Company completed a sale-leaseback of a vessel yielding net proceeds of $4,500. Included in this transaction was the retirement of the asset and related equipment note, and the transaction resulted in a deferred gain that will be amortized over the life of the lease.

5. 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, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	1,335	$	—		1,335	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 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	$	2,501	$	—	$	2,501	$	—

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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 could 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, 2018, 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 June 2019. As of June 30, 2018, there were 5.2 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through June 2019. Under these swap agreements, the Company will pay fixed prices ranging from $1.74 to $2.23 per gallon.

At June 30, 2018 and December 31, 2017, the fair value assets of the fuel hedge contracts were estimated to be $1,335 and $2,501, respectively, and are recorded in prepaid expenses and other current assets. For fuel hedge contracts considered to be highly effective, the gains reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the six months ended June 30, 2018 were $1,769. The remaining gains and losses included in accumulated other comprehensive loss at June 30, 2018 will be reclassified into earnings over the next twelve 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, 2018 and December 31, 2017 is as follows:

		Fair Value at
		June 30,		December 31,
	Balance Sheet Location	2018		2017
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	1,335	$	2,501

Accumulated other comprehensive income

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,
	2018			2017			2018			2017
Cumulative translation adjustments—net of tax	$	(57	)	$	6		$	1,304		$	(22	)
Derivatives:
Reclassification of derivative (gains) losses to earnings—net of tax		(1,037	)		155			(1,769	)		195
Change in fair value of derivatives—net of tax		910			(873	)		908			(1,647	)
Net unrealized gain on derivatives—net of tax		(127	)		(718	)		(861	)		(1,452	)
Total other comprehensive income (loss)	$	(184	)	$	(712	)	$	443		$	(1,474	)

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

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		Three Months Ended					Six Months Ended
		June 30,					June 30,
	Statement of Operations Location	2018			2017		2018			2017
Derivatives:
Fuelhedge contracts	Costs of contract revenues	$	(1,404	)	$	257	$	(2,396	)	$	323
	Income tax (provision) benefit		(367	)		102		(627	)		128
		$	(1,037	)	$	155	$	(1,769	)	$	195

The Company substantially completed the closeout of its Brazil operations, during the first quarter of 2018. This liquidation resulted in the reversal of the Company’s cumulative translation adjustment of $2,015, recorded during the first quarter of 2018, related to Brazil which is included in other expense in the Condensed Consolidated Statements of Operations.

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, 2018, refer to Note 4, Long-term debt. 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 $332,313 at June 30, 2018, 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.

6. 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, 2018, the Company granted 1,976 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 or restricted stock units. Compensation cost charged to expense related to share-based compensation arrangements was $1,255 and $840 for the three months ended June 30, 2018 and 2017, respectively, and $2,264 and $1,758 for the six months ended June 30, 2018 and 2017, respectively.

7. Revenue

The Company’s revenue is derived from contracts for services with federal, state, local and foreign governmental entities and private customers. Dredging revenues are generally derived from the enhancement or preservation of navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Revenues within the environmental & infrastructure segment are generally generated from environmental and geotechnical construction as well as soil, water and sediment environmental remediation.

Previously, the Company measured completion based on engineering estimates of the physical percentage completed for dredging contracts and based upon cost incurred to date compared to total estimated costs, also known as cost-to-cost, for environmental & infrastructure contracts. Under the new accounting principle, the Company measures progress toward completion on all contracts utilizing the cost-to-cost method. Additionally, the Company capitalizes certain pre-contract and pre-construction costs, and defers recognition over the life of the contract. At June 30, 2018, the impact of this change in accounting principle on the Condensed Consolidated Balance Sheets is as follows:

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	June 30, 2018
ASSETS
Contract revenues in excess of billings	$	(19,353	)
Other current assets		10,310
Other		5,012
LIABILITIES AND EQUITY
Accrued expenses		(547	)
Billings in excess of contract revenues		2,259
Deferred taxes		(1,493	)
Accumulated deficit	$	(4,250	)

For the three and six months ended June 30, 2018, the impact of this change in accounting principle on the Condensed Consolidated Statements of Operations is as follows:

	Three Months Ended			Six Months Ended
	June 30,			June 30,
	2018			2018
Contract revenues	$	(12,951	)	$	(21,612	)
Cost of contract revenues		(9,174	)		(15,869	)
Income tax benefit		982			1,493
Loss from continuing operations		(2,795	)		(4,250	)
Net loss	$	(2,795	)	$	(4,250	)
Comprehensive loss	$	(2,795	)	$	(4,250	)

Performance obligations

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account upon which the Company’s revenue is calculated. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue as the performance obligation is satisfied. Fixed-price contracts, which comprise substantially all of the Company’s revenue, will most often represent a single performance obligation as the promise to transfer the individual services is not separately identifiable from other promises in the contracts and, therefore, not distinct.

The Company capitalizes certain pre-contract and pre-construction costs, and defers recognition over the life of the contract. The Company’s performance obligations are satisfied over time and revenue is recognized using contract fulfillment costs incurred to date compared to total estimated costs at completion, also known as cost-to-cost, to measure progress towards completion. As the Company’s performance creates an asset that customer controls, this method provides a faithful depiction of the transfer of an asset to the customer. Generally, the Company has an enforceable right to payment for performance completed to date.

The dredging and environmental & infrastructure segments typically satisfy their performance obligations upon completion of service. The majority of the Company’s contracts are completed in a year or less. At June 30, 2018, the Company had $534,965 of remaining performance obligations, which the Company refers to as total backlog. Approximately 52% of the Company’s backlog will be completed in 2018 with the remaining balance expected to be completed by 2020.

Transaction price

The transaction price is calculated using the Company’s estimated costs to complete a project. These costs are based on the types of equipment required to perform the specified service, project site conditions, the estimated project duration, seasonality, location and complexity of a project.

The nature of the Company’s contracts gives rise to several types of variable consideration, including pay on quantity dredged for dredging projects and contract modifications for both dredging and environmental & infrastructure projects. For dredging projects, estimated pay quantity is the amount of material the Company expects to dredge for which it will receive payment. Estimated quantity to be dredged is calculated using engineering estimates based on current survey data and the Company’s knowledge based on historical project experience. Contract modifications are changes in the scope or price (or both) of a contract that are approved by the

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parties to the contract. The Company recognizes a contract modification when the parties to a contract approve a modification that either creates new, or changes existing, enforceable rights and obligations of the parties to the contract. Contract modifications are included in the transaction price only if it is probable that the modification estimate will not result in a significant reversal of revenue. Contract modifications are routine in the performance of the Company’s contracts. In most instances, contract modifications are for services that are not distinct, and, therefore, are accounted for as part of the existing contract.

Revisions in estimated gross profit percentages are recorded in the period during which the change in circumstances is experienced or becomes known. As the duration of most of the Company’s contracts is one year or less, the cumulative net impact of these revisions in estimates, individually and in the aggregate across our projects, does not significantly affect our results across annual reporting periods. Provisions for estimated losses on contracts in progress are made in the period in which such losses are determined.

Revenue by category

The following series of tables presents our revenue disaggregated by several categories.

Domestically, our work generally is performed in coastal waterways and deep water ports. The U.S. dredging market consists of four primary types of work: capital, coastal protection, maintenance and rivers & lakes.Foreign projects typically involve capital work.

The following table sets forth, by segment and type of work, the Company’s contract revenues for the periods ended:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Revenues (in thousands)	2018		2017			2018		2017
Dredging:
Capital—U.S.	$	69,651	$	31,472		$	146,603	$	98,073
Capital—foreign		3,279		12,420			8,802		31,574
Coastal protection		38,121		60,304			79,982		100,639
Maintenance		19,077		34,337			26,880		56,250
Rivers & lakes		5,142		13,974			6,626		19,025
Total dredging revenues		135,270		152,507			268,893		305,561
Environmental & infrastructure		15,320		24,711			28,290		43,935
Intersegment revenue		—		(359	)		—		(2,051	)
Total revenues	$	150,590	$	176,859		$	297,183	$	347,445

The following table sets forth, by segment and type of customer, the Company’s contract revenues for the periods ended:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Revenues (in thousands)	2018		2017			2018		2017
Dredging:
Federal government	$	92,913	$	83,632		$	169,607	$	195,126
State and local government		23,346		45,027			69,971		60,672
Private		15,732		11,428			20,513		18,189
Foreign		3,279		12,420			8,802		31,574
Total dredging revenues		135,270		152,507			268,893		305,561
Environmental & infrastructure:
Private		11,037		10,961			17,401		21,496
Other		4,283		13,750			10,889		22,439
Intersegment revenue		—		(359	)		—		(2,051	)
Total revenues	$	150,590	$	176,859		$	297,183	$	347,445

Foreign dredging revenue was $3,279 and $12,420 for the three months ended June 30, 2018 and 2017, respectively, and $8,802 and $31,574 for the six months ended June 30, 2018 and 2017, respectively, and was mostly attributable to work done in the Middle East.

Contract balances

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Billings on contracts are generally submitted after verification with the customers of physical progress and are recognized as accounts receivable in the balance sheet. For billings that do not match the timing of revenue recognition, the difference between amounts billed and recognized as revenue is reflected in the balance sheet as either contract revenues in excess of billings or billings in excess of contract revenues. Certain pre-contract and pre-construction costs are capitalized and reflected as contract assets in the balance sheet. Customer advances, deposits and commissions are reflected in the balance sheet as contract liabilities.

Accounts receivable at June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
	2018			2017
Completed contracts	$	13,859		$	15,974
Contracts in progress		50,302			42,759
Retainage		18,575			21,866
		82,736			80,599
Allowance for doubtful accounts		(430	)		(591	)
Total accounts receivable—net	$	82,306		$	80,008
Current portion of accounts receivable—net	$	82,306		$	75,533
Long-term accounts receivable and retainage		—			4,475
Total accounts receivable—net	$	82,306		$	80,008

The components of contracts in progress at June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
	2018			2017
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	482,780		$	558,557
Amounts billed		(447,617	)		(490,732	)
Costs and earnings in excess of billings for contracts in progress		35,163			67,825
Costs and earnings in excess of billings for completed contracts		19,840			22,963
Total contract revenues in excess of billings	$	55,003		$	90,788
Billings in excess of costs and earnings:
Amounts billed	$	(219,428	)	$	(325,350	)
Costs and earnings for contracts in progress		210,378			321,735
Total billings in excess of contract revenues	$	(9,050	)	$	(3,615	)

The Company has $17,693 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 costs incurred related to this project. Additionally, the timing of realization may be impacted by the timing of a delay in the sale of these environmental credits, requiring a longer period required to recover our investment.

For amounts included in billings in excess of contract revenues balance at the beginning of the year, the Company recognized nearly all of the related revenue during the six months ended June 30, 2018.

At June 30, 2018 and January 1, 2018, costs to fulfill contracts with customers recognized as an asset were $16,300 and $7,732, respectively, and are recorded in other current assets and other noncurrent assets. These costs relate to pre-contract and pre-construction activities. During the three and six months ended June 30, 2018, the company amortized $4,299 and $6,796 of pre-construction costs, respectively.

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8. Restructuring charges

In 2017, a strategic review was begun to improve the Company’s financial results in both domestic and international operations enabling debt reduction, improvements in return on capital and the continued renewal of our extensive fleet with new and efficient dredges to best serve our domestic and international clients. As a result of this review, management began execution of a plan to reduce general and administrative and overhead expenses, retire certain underperforming and underutilized assets, write-off pre-contract costs on a project that was never formally awarded and that the Company no longer intends to pursue and closeout the Company’s Brazil operations. These changes will result in total restructuring charges of approximately $42,000-$47,000, including severance of approximately $3,000, asset retirements of approximately $30,000-$34,000, pre-contract costs of approximately $6,500 and closeout costs of approximately $2,500-$3,500.

Approximately $38,000-$43,000 of this charge consists of non-cash items including depreciation, loss on sale of assets and other items, approximating totals of $12,500-$14,500, $3,000-$5,000 and $21,500-$23,500, respectively. The majority of the charge was recorded in the second half of 2017 with the remainder to be recognized in the dredging segment in 2018.

Restructuring charges currently recognized for the above actions are summarized as follows:

	Three Months Ended			Six Months Ended
	June 30, 2018			June 30, 2018
Costs of contract revenues - depreciation	$	1,676		$	4,668
Costs of contract revenues - other		(274	)		993
General and administrative expenses		(28	)		(21	)
Gain on sale of assets—net		(840	)		(847	)
Other expense		—			2,015
Total Dredging		534			6,808
General and administrative expenses		(9	)		159
Total Environmental & Infrastructure		(9	)		159
Costs of contract revenues - depreciation		1,676			4,668
Costs of contract revenues - other		(274	)		993
General and administrative expenses		(37	)		138
Gain on sale of assets—net		(840	)		(847	)
Other expense		—			2,015
Total Consolidated	$	525		$	6,967

The Company accrued rent expense of $4,959 and $5,930 and severance expense of $849 and $1,567 at June 30, 2018 and December 31, 2017, respectively. Both of these items are included in accrued expenses at June 30, 2018 and December 31, 2017 and are expected to be settled in 2018.

9. 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 and Liberty Mutual Insurance Company, under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty, Surety Company of America and Zurich American Insurance Company (“Zurich”). 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, 2018, the Company had outstanding performance bonds with a notional amount of approximately $1,245,099 of which $41,085 relates to projects from the Company’s historical environmental & infrastructure businesses. The revenue value remaining in backlog related to these projects totaled approximately $498,059.

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

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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 11, Business dispositions.

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 U.S. federal government, the U.S. federal 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 U.S. federal 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.

10. Investments

The Company owned 50% of TerraSea Environmental Solutions (“TerraSea”) as a joint venture. TerraSea was engaged in the environmental services business through its ability to remediate contaminated soil and dredged sediment treatment. During the second

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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. TerraSea was dissolved in the third quarter of 2017.

11. 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 9, Commitments and contingencies, 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 three and 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 $11,400and will be determined based on the attainment of an average Adjusted EBITDA target of Magnus, now referred to as Great Lakes E&I, 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, Great Lakes E&I is not expected to reach the minimum Adjusted EBITDA threshold designated in the amended share purchase agreement.

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12. 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,
	2018			2017			2018			2017
Dredging
Contract revenues	$	135,270		$	152,507		$	268,893		$	305,561
Operating income		11,567			2,989			13,745			3,725
Environmental & infrastructure
Contract revenues	$	15,320		$	24,711		$	28,290		$	43,935
Operating loss		(3,433	)		(143	)		(6,651	)		(2,873	)
Intersegment revenues	$	—		$	(359	)	$	—		$	(2,051	)
Total
Contract revenues	$	150,590		$	176,859		$	297,183		$	347,445
Operating income		8,134			2,846			7,094			852

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Cautionary note regarding forward-looking statements

Certain statements in this Quarterly Report on Form 10-Q may constitute “forward-looking” statements as defined in Section 27A of the Securities Act of 1933 (the “Securities Act”), Section 21E of the Securities Exchange Act of 1934 (the “Exchange Act”), the Private Securities Litigation Reform Act of 1995 (the “PSLRA”) or in releases made by the Securities and Exchange Commission (“SEC”), all as may be amended from time to time. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause the actual results, performance or achievements of Great Lakes Dredge & Dock Corporation and its subsidiaries (“Great Lakes” or the “Company”), or industry results, to differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements. Statements that are not historical fact are forward-looking statements. Forward-looking statements can be identified by, among other things, the use of forward-looking language, such as the words “plan,” “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “may,” “would,” “could,” “should,” “seeks,” or “scheduled to,” or other similar words, or the negative of these terms or other variations of these terms or comparable language, or by discussion of strategy or intentions. In addition, these statements include, but are not limited to, our statements regarding the likelihood of realizing, and amount of, expected restructuring charges to be realized in connection with the restructuring activities.

These cautionary statements are being made pursuant to the Securities Act, the Exchange Act and the PSLRA with the intention of obtaining the benefits of the “safe harbor” provisions of such laws. Great Lakes cautions investors that any forward-looking statements made by Great Lakes are not guarantees or indicative of future performance. Important assumptions and other important factors that could cause actual results to differ materially from those forward-looking statements with respect to Great Lakes, include, but are not limited to, risks and uncertainties that are described in Item 1A. “Risk Factors” of Great Lakes’ Annual Report on Form 10-K for the year ended December 31, 2017, and in other securities filings by Great Lakes with the SEC.

Although Great Lakes believes that its plans, intentions and expectations reflected in or suggested by such forward-looking statements are reasonable, actual results could differ materially from a projection or assumption in any forward-looking statements. Great Lakes’ future financial condition and results of operations, as well as any forward-looking statements, are subject to change and inherent risks and uncertainties. The forward-looking statements contained in this Quarterly Report on Form 10-Q are made only as of the date hereof and Great Lakes does not have or undertake any obligation to update or revise any forward-looking statements whether as a result of new information, subsequent events or otherwise, unless otherwise required by law.

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General

The Company is the largest provider of dredging services in the United States and a major provider of environmental and infrastructure services. In addition, the Company is the only U.S. dredging service provider with significant international operations. The mobility of the Company’s fleet enables the Company to move equipment in response to changes in demand for dredging services.

Dredging generally involves the enhancement or preservation of navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Domestically, our work generally is performed in coastal waterways and deep water ports. The U.S. dredging market consists of four primary types of work: capital, coastal protection, maintenance and rivers & lakes. The Company’s bid market is defined as the aggregate dollar value of domestic dredging projects on which the Company bid or could have bid if not for capacity constraints (“bid market”). The Company experienced an average combined bid market share in the U.S. of 46% over the prior three years, including 77%, 40%, 28% and 14% of the domestic capital, coastal protection, maintenance and rivers & lakes sectors, respectively.

The Company’s largest domestic dredging customer is the U.S. Army Corps of Engineers (the “Corps”), which has responsibility for federally funded projects related to navigation and flood control of U.S. waterways. In the first six months of 2018, the Company’s dredging revenues earned from contracts with federal government agencies, including the Corps as well as other federal entities were approximately 63% of dredging revenues, in line with the Company’s prior three year average of 64%.

The Company’s environmental & infrastructure segment provides environmental and geotechnical construction as well as soil, water and sediment environmental remediation for the state, local and private party markets. Environmental and geotechnical construction includes the creation, repair or stabilization of environmental barriers including slurry walls, in-situ stabilization, coal combustion residuals pond cap and close, dam and levee rehabilitation and other specialty civil construction. Remediation involves the containment, immobilization or removal of contamination from an environment through the use of any combination of isolation, treatment or exhumation techniques, including off-site disposal, based on the quantity and severity of the contamination. The environmental & infrastructure segment accounted for 10% of total revenues in the first six months of 2018.

The Company has two operating segments: dredging and environmental & infrastructure, which are also the Company’s two reportable segments and reporting units.

Results of operations

The following tables set forth the components of net loss and Adjusted EBITDA from continuing operations, as defined below, as a percentage of contract revenues for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Contract revenues		100.0	%		100.0	%		100.0	%		100.0	%
Costs of contract revenues		(85.2	)		(88.5	)		(87.6	)		(89.9	)
Gross profit		14.8			11.5			12.4			10.1
General and administrative expenses		10.1			9.8			10.5			9.8
(Gain) loss on sale of assets—net		(0.7	)		0.1			(0.4	)		0.1
Operating income		5.4			1.7			2.3			0.2
Interest expense—net		(6.0	)		(3.6	)		(5.9	)		(3.5	)
Equity in loss of joint ventures		—			(0.8	)		—			(0.4	)
Loss on extinguishment of debt		—			(1.3	)		—			(0.7	)
Other expense		—			(0.2	)		(1.0	)		—
Loss from continuing operations before income taxes		(0.6	)		(4.2	)		(4.6	)		(4.4	)
Income tax (provision) benefit		—			2.0			1.1			1.8
Loss from continuing operations		(0.6	)		(2.2	)		(3.5	)		(2.6	)
Income (loss) from discontinued operations, net of income taxes		—			0.2			—			(3.7	)
Net loss		(0.6	)		(2.2	)		(3.5	)		(6.3	)
Adjusted EBITDA from continuing operations		14.2	%		8.5	%		11.1	%		7.7	%

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Adjusted EBITDA from continuing operations, as provided herein, represents net income (loss), adjusted for net interest expense, income taxes, depreciation and amortization expense, debt extinguishment, accelerated maintenance expense for new international deployments, goodwill or asset impairments and gains on bargain purchase acquisitions. Adjusted EBITDA from continuing operations is not a measure derived in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Company presents Adjusted EBITDA from continuing operations as an additional measure by which to evaluate the Company’s operating trends. The Company believes that Adjusted EBITDA from continuing operations is a measure frequently used to evaluate performance of companies with substantial leverage and that the Company’s primary stakeholders (i.e., its stockholders, bondholders and banks) use Adjusted EBITDA from continuing operations to evaluate the Company’s period to period performance. Additionally, management believes that Adjusted EBITDA from continuing operations provides a transparent measure of the Company’s recurring operating performance and allows management and investors to readily view operating trends, perform analytical comparisons and identify strategies to improve operating performance. For this reason, the Company uses a measure based upon Adjusted EBITDA from continuing operations to assess performance for purposes of determining compensation under the Company’s incentive plan. Adjusted EBITDA from continuing operations should not be considered an alternative to, or more meaningful than, amounts determined in accordance with GAAP including: (a) operating income as an indicator of operating performance; or (b) cash flows from operations as a measure of liquidity. As such, the Company’s use of Adjusted EBITDA from continuing operations, instead of a GAAP measure, has limitations as an analytical tool, including the inability to determine profitability or liquidity due to the exclusion of accelerated maintenance expense for new international deployments, goodwill or asset impairments, gains on bargain purchase acquisitions, interest and income tax expense and the associated significant cash requirements and the exclusion of depreciation and amortization, which represent significant and unavoidable operating costs given the level of indebtedness and capital expenditures needed to maintain the Company’s business. For these reasons, the Company uses operating income to measure the Company’s operating performance and uses Adjusted EBITDA from continuing operations only as a supplement. The following is a reconciliation of Adjusted EBITDA from continuing operations to net income (loss):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
(in thousands)
Net loss	$	(974	)	$	(3,856	)	$	(10,295	)	$	(21,495	)
Income (loss) from discontinued operations, net of income taxes		—			368			—			(12,697	)
Loss from continuing operations		(974	)		(4,224	)		(10,295	)		(8,798	)
Adjusted for:
Interest expense—net		8,997			6,441			17,657			12,023
Income tax (provision) benefit		54			(3,454	)		(3,241	)		(6,247	)
Depreciation and amortization		13,340			14,023			28,981			27,501
Loss on extinguishment of debt		—			2,330			—			2,330
Adjusted EBITDA from continuing operations	$	21,417		$	15,116		$	33,102		$	26,809

The following table sets forth, by segment and type of work, the Company’s contract revenues for each of the periods indicated:

	Three Months Ended								Six Months Ended
	June 30,								June 30,
Revenues (in thousands)	2018		2017			Change			2018		2017			Change
Dredging:
Capital—U.S.	$	69,651	$	31,472			121.3	%	$	146,603	$	98,073			49.5	%
Capital—foreign		3,279		12,420			(73.6	)%		8,802		31,574			(72.1	)%
Coastal protection		38,121		60,304			(36.8	)%		79,982		100,639			(20.5	)%
Maintenance		19,077		34,337			(44.4	)%		26,880		56,250			(52.2	)%
Rivers & lakes		5,142		13,974			(63.2	)%		6,626		19,025			(65.2	)%
Total dredging revenues		135,270		152,507			(11.3	)%		268,893		305,561			(12.0	)%
Environmental & infrastructure		15,320		24,711			(38.0	)%		28,290		43,935			(35.6	)%
Intersegment revenue		—		(359	)		(100.0	)%		—		(2,051	)		(100.0	)%
Total revenues	$	150,590	$	176,859			(14.9	)%	$	297,183	$	347,445			(14.5	)%

Total revenue was $150.6 million for the three months ended June 30, 2018, down $26.3 million, or 15%, from $176.9 million for the same period in the prior year. For the six months ended June 30, 2018, total revenue was $297.2 million, down from revenue of $347.4 million for the same period in the prior year, representing a decrease of $50.2 million or 14%. For the three and six months

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ended June 30, 2018, the Company experienced an increase in domestic capital revenues offset by decreases in all other types of work within both segments when compared to the prior year periods.

Capital dredging consists primarily of port expansion projects, which involve the deepening of channels and berthing basins to allow access by larger, deeper draft ships and the provision of land fill used to expand port facilities. In addition to port work, capital projects also include coastal restoration and land reclamations, trench digging for pipelines, tunnels and cables, and other dredging related to the construction of breakwaters, jetties, canals and other marine structures. For the quarter ended June 30, 2018, domestic capital dredging was $69.7 million, up $38.2 million, or 121%, compared to $31.5 million for the same quarter in 2017. The increase in domestic capital dredging revenues for the quarter was driven by a greater amount of revenue being earned on coastal restoration projects in Louisiana and Mississippi in the current quarter compared to the same period of the prior year. The Charleston entrance channel deepening projects also contributed to the increase in revenue for the three months ended June 30, 2018. These increases in revenue were partially offset by a liquefied natural gas (“LNG”) project in Texas earning higher revenue during the same period in the prior year. Domestic capital dredging for the six months ended June 30, 2018 was $146.6 million compared to $98.1 million for the same period in 2017, representing an increase of $48.5 million, or 49%. For the six months ended June 30, 2018, the higher domestic capital dredging revenues were primarily related to a greater amount of revenue earned on coastal restoration projects and the Charleston entrance deepening projects during the first six months of 2018 as compared to the same period in the prior year. This increase was partially offset by a greater amount of revenue earned on a deepening project on the Delaware River and a LNG project in Texas during the first half of 2017. The Savannah Harbor deepening project also contributed to revenue for the six months ended June 30, 2018.

Foreign capital projects typically involve land reclamations, channel deepening and port infrastructure development. In the second quarter of 2018, foreign capital revenue was $3.3 million, a decrease of $9.1 million, or 73%, as compared to $12.4 million in the same quarter in the prior year. Foreign capital revenue for the first half of 2018 was $8.8 million, a decrease of $22.8 million, or 72%, as compared to $31.6 million for the same period in the prior year. For the three and six months ended June 30, 2018, revenue earned on two projects in Bahrain was offset by revenue earned on a project in Saudi Arabia during 2017 that was not replaced during the current year. Delays in the commencement of a large land reclamation project in Bahrain further contributed to the change in revenue for the three and six months ended June 30, 2018 compared to the same periods of the prior year. During the first quarter of 2018, the Company substantially completed the closeout of its Brazil operations. The absence of projects in Brazil during the current year contributed to the change in revenue for the two periods.

Coastal protection projects generally involve moving sand from the ocean floor to shoreline locations where erosion threatens shoreline assets. Coastal protection revenue for the quarter ended June 30, 2018 was $38.1 million, a decrease of $22.2 million, or 37%, compared to $60.3 million in the prior year period. The decrease in coastal protection revenue for the three months ended June 30, 2018 is mostly attributable to a decrease in revenue earned from projects in New York and New Jersey, Virginia and North Carolina. That decrease was partially offset by an increase in revenue from projects in Florida and Delaware. Coastal protection revenue for the six months ended June 30, 2018 was $80.0 million, down $20.6 million or 21%, from $100.6 million for the first six months of 2017. The decrease in coastal protection revenue for the six months ended June 30, 2018 was mostly attributable to prior year revenue earned on projects in New York, New Jersey and Virginia. This decrease was partially offset by revenue earned during the current year on large projects in Florida and Georgia as compared to the same period in 2017. Additionally, revenue for the first half of 2017 included a project in North Carolina that did not repeat during the current year period. A coastal protection project in South Carolina also contributed to revenue for the first half of 2018.

Maintenance dredging consists of the re-dredging of previously deepened waterways and harbors to remove silt, sand and other accumulated sediments. Due to natural sedimentation, most channels generally require maintenance dredging every one to three years, thus creating a recurring source of dredging work that is typically non-deferrable if optimal navigability is to be maintained. In addition, severe weather such as hurricanes, flooding and droughts can also cause the accumulation of sediments and drive the need for maintenance dredging. Maintenance revenue for the second quarter of 2018 was $19.1 million, down $15.2 million, or 44%, from $34.3 million in the second quarter of 2017. The decrease in maintenance revenues for the three months ended June 30, 2018 was mostly attributable to revenue earned on projects in Maryland, North Carolina and other locations in the Northwest in 2017 that did not repeat in 2018. Maintenance projects in Texas and Virginia contributed to revenue during the three months ended June 30, 2018. Maintenance revenue for the first six months of 2018 was $26.9 million, a decrease of $29.4 million, or 52%, compared to $56.3 million for the comparable period in the prior year. The decrease in maintenance dredging revenues for the three and six months ended June 30, 2018 was mostly attributable to a greater volume of projects worked during the same periods in the prior year. Maintenance projects in Texas, Virginia, Mississippi and Maryland contributed to revenue during the three and six months ended June 30, 2018.

Rivers & lakes dredging and related operations typically consist of lake and river dredging, inland levee and construction dredging, environmental restoration and habitat improvement and other marine construction projects. During the second quarter of 2018 rivers & lakes revenue was $5.1 million, a decrease of $8.9 million, or 64% from $14.0 million during the same period of 2017. Rivers & lakes revenue for the six months ended June 30, 2018 was $6.6 million, down $12.4 million, or 65%, from $19.0 million in the first six

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months of 2017. The decrease in rivers & lakes revenue for the three and six months ended June 30, 2018 was driven by a greater amount of revenue earned on a lake project in Illinois in the prior year periods and a project in Florida that did not reoccur in the current year.

The environmental & infrastructure segment provides environmental and geotechnical construction as well as soil, water and sediment environmental remediation. Environmental and geotechnical construction includes the creation, repair or stabilization of environmental barriers including slurry walls, in-situ stabilization, coal combustion residuals pond cap and close, dam and levee rehabilitation, deep soil mixing and other specialty civil construction. Remediation involves the containment, immobilization or removal of contamination from an environment through the use of any combination of isolation, treatment or exhumation techniques, including off-site disposal, based on the quantity and severity of the contamination. Environmental & infrastructure segment revenues during the second quarter of 2018 were $15.3 million, a $9.4 million, or 38%, decrease from $24.7 million for the same prior year period. For the six months ended June 30, 2018, the environmental & infrastructure segment recorded revenues of $28.3 million, a $15.6 million, or 36%, decrease from $43.9 million for the same prior year period. Environmental & infrastructure revenue for the first six months of 2018 included work on remediation projects in New Jersey and California and a geotechnical project in Texas. Revenue on these projects was offset by greater revenue earned in the prior year on remediation projects in Florida, Pennsylvania and Colorado in addition to emergency geotechnical work that did not repeat during the current year. The three and six months ended June 30, 2017 include revenue related to service lines of the environmental & infrastructure segment’s business which did not operate during the current year.

Consolidated gross profit for the quarter ended June 30, 2018 was $22.2 million, up $1.9 million, or 9%, compared to $20.3 million in the same quarter of 2017. Gross profit margin for the three months ended June 30, 2018 was 14.7% compared to 11.5% in the second quarter of 2017. Gross profit for the three months ended June 30, 2018 includes $1.4 million of restructuring charges related to asset retirements. For the second quarter of 2018, the increase in gross profit was due to improved project performance, greater fixed cost coverage and lower overhead in the dredging segment offset by lower margin on environmental & infrastructure projects compared to the same period in the prior year. Consolidated gross profit for the six months ended June 30, 2018 was $36.9 million, up $1.8 million, or 5%, compared to $35.1 million in the same period of the prior year. Gross profit margin for the six months ended June 30, 2018 was 12.4% up from 10.1% in the first six months of 2017. Gross profit for the six months ended June 30, 2018 includes $5.7 million of restructuring charges related to asset retirements and the closeout of the Company’s Brazil operations. During the six months ended June 30, 2018, the Company incurred lower plant costs when compared to the same period of the prior year resulting from the retirement of certain underperforming and underutilized assets. This change was partially offset by lower margin experienced in the environmental & infrastructure segment primarily attributable to a project loss and lower fixed cost coverage on plant due to lower volume of work during the first half of 2018. Further, the prior year periods include an approved change order on a project in the environmental & infrastructure segment which positively impacted gross profit.

During the three and six months ended June 30, 2018, general and administrative expenses were $15.2 million and $31.1 million, respectively, compared to the same periods in prior year in which the three and six months totaled $17.3 million and $34.1 million, respectively. General and administrative expenses decreased by $2.1 million and $3.0 million for the three and six months ended June 30, 2018, respectively compared to the same periods of the prior year. These decreases were attributable to decreases in payroll and benefits for the three and six months of $0.9 million and $1.3 million, respectively. Further decreases in technical and consulting fees of $0.7 million and $1.1 million for the three and six months, respectively contributed to the change in general and administrative expenses compared to the same periods of 2017. The first half of 2018 includes $0.1 million of general and administrative charges associated with restructuring.

Operating income for the second quarter of 2018 was $8.1 million, up $5.3 million compared to operating income of $2.8 million for the same quarter in 2017. The increase in operating income for the second quarter of 2018 was a result of higher gross profit and lower general and administrative expenses compared to the same period in the prior year, as described above. This increase in operating income was offset by a $1.2 million decrease in gain on sale of assets. For the six months ended June 30, 2018, the Company experienced operating income of $7.1 million, a change of $6.2 million, from operating income of $0.9 million in the same prior year period. The change in operating loss for the second quarter of 2018 was a result of lower general and administrative expenses partially and higher gross profit compared to the same period in the prior year, as described above. For the six months ended June 30, 2018, there was a $1.4 million increase in gain on sale of assets.

For the three months ended June 30, 2018 and 2017, net interest expense was $9.0 million and $6.4 million, respectively. Net interest expense for the six months ended June 30, 2018 was $17.7 million, up $5.7 million, or 48%, from interest expense of $12.0 million for the same period in the prior year. The increase in interest expense for the six months ended June 30, 2018 was primarily attributable to a decrease in the amount of interest expense that was being capitalized during the construction of the Company’s dual mode articulated tug/barge trailing suction hopper dredge, the Ellis Island, and an increase in interest expense related to the higher principal on the Company’s new senior notes as compared to the same periods in the prior year.

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Income tax provision for the three months ended June 30, 2018 was $0.1 million compared to an income tax benefit of $3.5 million, for the same period in the prior year. For the six months ended June 30, 2018 and 2017, the income tax benefit was $3.2 million and $6.2 million, respectively. The effective tax rate for the six months ended June 30, 2018 was 23.9%, lower than the effective tax rate of 41.5% for the same period of 2017. The change in effective tax rate is attributable to the recent Tax Cuts and Jobs Act enacted in the fourth quarter of 2017.

The Company experienced a net loss from continuing operations of $1.0 million and a diluted loss per share attributable to continuing operations of $0.02 for the three months ended June 30, 2018, compared to a net loss from continuing operations of $4.2 million and diluted loss per share attributable to continuing operations of $0.07 for the three months ended June 30, 2017. The Company experienced a net loss from continuing operations of $10.3 million and a diluted loss per share attributable to continuing operations of $0.17 for the six months ended June 30, 2018, compared to a net loss from continuing operations of $8.8 million and a diluted loss per share attributable to continuing operations of $0.14 for the same period of 2017. The change in net loss from continuing operations for the three and six months was driven by an increase in interest expense offset by a $2.3 million loss on extinguishment of debt resulting from the Company’s senior notes and a $1.5 million loss associated with the Company’s TerraSea joint venture that were incurred in the same period in the prior year. The change in net loss from continuing operations for the six months ended June 30, 2018 was driven by a $2.0 million charge to other expense for the reversal of a currency translation adjustment related to the closeout of the Company’s Brazil operations during the current year. These items were partially offset by positive changes to operating income and income tax benefit, as noted above, during the first six months of 2018 when compared to the same period in the prior year.

Adjusted EBITDA from continuing operations (as defined on page 24) for the quarter ended June 30, 2018 was $21.4 million, up $6.3 million, or 42%, from $15.1 million in the same quarter in the prior year. The change in Adjusted EBITDA from continuing operations during the second quarter of 2018 was driven by higher gross profit, excluding depreciation. This change was increased by lower general and administrative expenses and an increase of $1.2 million in (gain) loss on sale of fixed assets, as described above. For the six months ended June 30, 2018, Adjusted EBITDA from continuing operations was $33.1 million, up $6.3 million, or 23.5% compared to $26.8 million for the same prior year period. The change in Adjusted EBITDA from continuing operations during the first six months of 2018 was attributable to higher gross profit, excluding depreciation, mostly offset by the $2.0 million charge to other expense, as described above. The three and six months ended June 30, 2017 included a $1.5 million loss associated with the Company’s TerraSea joint venture.

Results by segment

Dredging

Dredging segment revenues for the second quarter of 2018 were $135.3 million, a decrease of $17.2 million, or 11% as compared to revenues of $152.5 million for the second quarter of 2017. Dredging revenues for the six months ended June 30, 2018 were $268.9 million, down $36.7 million, or 12%, compared to revenues of $305.6 million for the same prior year period. For the six months ended June 30, 2018, the dredging segment the experienced an increase in domestic capital revenues. This increase was offset by decreases in all other types of work. This change in current year revenues was driven by a greater volume of maintenance projects worked during the three and six months ended June 30, 2017 as compared to the current year periods as well as revenue earned on a project in Saudi Arabia during the first half of 2017 that did not repeat in 2018. Further, the Company earned a greater amount of revenue on a lake project in Illinois and on coastal protection projects in New York, New Jersey and Virginia during the first six months of 2017. These negative impacts to the change in revenue year over year were partially offset by higher domestic capital dredging revenues driven by revenue earned on coastal restoration projects as well as the Charleston entrance channel deepening projects during the three and six months ended June 30, 2018.

Dredging segment gross profit for the second quarter of 2018 was $22.1 million, an increase of $6.1 million or 38%, from a gross profit of $16.0 million in the same period of the prior year. For the six months ended June 30, 2018, the dredging segment gross profit was $36.3 million, up from a gross profit of $29.1 million in the same period of 2017. Dredging segment gross profit margin for the second quarter of 2018 was 16.3% compared to 10.5% for the second quarter of 2017. Further, dredging segment gross profit margin for the six months ended June 30, 2018 increased to 13.5% from gross profit margin of 9.5% for the six months of 2017. Gross profit for the three and six months ended June 30, 2018 includes $1.4 million and $5.7 million, respectively, of restructuring charges related to asset retirements and the closeout of the Company’s Brazil operations. The increase in dredging segment gross profit for the three months ended June 30, 2018 was attributable to improved project execution, greater fixed cost coverage and a reduction of overhead when compared to the same quarter in the prior year. The increase in dredging segment gross profit for the first half of 2018 was driven by lower spend on plant costs during the current year when compared to the same period of the prior year resulting from the retirement of certain underperforming and underutilized assets. This increase was partially offset by lower margins on some of the Company’s domestic dredging projects.

For the quarter ended June 30, 2018, the dredging segment recorded operating income of $11.6 million, up $8.6 million, from $3.0 million for the same period of the prior year. Dredging segment operating income for the six months ended June 30, 2018 was $13.7

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million, a $10.0 million increase from $3.7 million in the first six months of 2017. The change in operating income for the three and six months ended June 30, 2018 is primarily attributable to higher gross profit, as described above. General and administrative expenses within the dredging segment declined slightly during the three and six months ended June 30, 2018, mostly related to decreases in payroll and benefits expense, resulting from restructuring savings initiatives, slightly offset by increases in legal and professional fees compared to the same periods in 2017. The Company recorded a gain on sale of assets of $1.1 million and $1.3 million for the three and six months ended June 30, 2018, respectively, which further contributed to the increase in operating income compared to the same prior year periods.

Environmental & infrastructure

For the quarter ended June 30, 2018, environmental & infrastructure revenues were $15.3 million, down $9.4 million from revenues of $24.7 million in the same quarter of the previous year. Environmental & infrastructure segment revenues for the six months ended June 30, 2018 were $28.3 million, down $15.6 million, or 36%, from revenue of $43.9 million for the first six months of 2017. Environmental & infrastructure revenues for the first six months of 2018 included work on remediation projects in New Jersey and California and a geotechnical project in Texas. Revenue on these projects was offset by greater revenue earned in the prior year on remediation projects in Florida, Pennsylvania and Colorado in addition to emergency geotechnical work that did not repeat during the current year. Additionally, the three and six months ended June 30, 2017 includes revenue related to service lines of the environmental & infrastructure segment’s business which did not operate during the current year.

Environmental & infrastructure segment gross profit for the second quarter of 2018 was $0.1 million, down $4.2 million, from gross profit of $4.3 million in the second quarter of 2017. The environmental & infrastructure segment experienced a gross profit of $0.7 million and $6.0 million for the six months ended June 30, 2018 and 2017, respectively. Environmental & infrastructure gross profit margin was 0.7% and 17.3% for the three months ended June 30, 2018 and 2017, respectively. For the first six months of 2018, the environmental & infrastructure segment experienced a gross profit margin of 2.5% compared to 13.6% for the same period of the prior year. The change in gross profit was driven by lower margins on projects in the second quarter of 2018 when compared to the same period in the prior year. The change in gross profit during the six months ended June 30, 2018 was driven lower margin resulting from a project loss and lower fixed cost coverage on plant due to lower volume of work during the first half of 2018. Further, the prior year periods include an approved change order on a project which positively impacted the environmental & infrastructure segment’s gross profit.

The environmental & infrastructure segment experienced an operating loss of $3.4 million for the quarter ended June 30, 2018, a $3.3 million change from an operating loss of $0.1 million for the same quarter in 2017. For the six months ended June 30, 2018, the environmental & infrastructure segment experienced an operating loss of $6.7 million, a change of $3.8 million compared to an operating loss of $2.9 million for the same period of the prior year. The change in operating loss for the six months ended June 30, 2018 is mostly attributable to the decrease in gross profit, as described above, partially offset by a decrease in general and administrative expenses. For the three and six months ended June 30, 2018, the environmental & infrastructure segment experienced decreases in payroll and benefits expenses resulting from restructuring savings initiatives and a slight decline in technical and consulting fees when compared to the same periods in 2017.

Bidding activity and backlog

The following table sets forth, by reporting segment and type of dredging work, the Company’s backlog as of the dates indicated:

	June 30,		December31,		June 30,
Backlog (in thousands)	2018		2017		2017
Dredging:
Capital - U.S.	$	335,588	$	383,577	$	238,581
Capital - foreign		3,788		8,575		9,784
Coastal protection		129,689		76,460		55,439
Maintenance		12,254		23,662		42,866
Rivers & lakes		25,192		19,046		38,801
Dredging Backlog		506,511		511,320		385,471
Environmental & infrastructure		28,454		35,357		52,768
Total Backlog	$	534,965	$	546,677	$	438,239

The Company’s contract backlog represents its estimate of the revenues that will be realized under the portion of the contracts remaining to be performed. For dredging and environmental & infrastructure contracts these estimates are based on the time and remaining costs required to complete the project relative to total estimated project costs and project revenues agreed to with the

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customer. However, these estimates are necessarily subject to variances based upon actual circumstances. Because of these factors, as well as factors affecting the time required to complete each job, backlog is not always indicative of future revenues or profitability. Also, 82% of the Company’s June 30, 2018 dredging backlog relates to federal government contracts, which can be canceled at any time without penalty to the government, subject to the Company’s contractual right to recover the Company’s actual committed costs and profit on work performed up to the date of cancellation. The Company’s backlog may fluctuate significantly from quarter to quarter based upon the type and size of the projects the Company is awarded from the bid market. A quarterly increase or decrease of the Company’s backlog does not necessarily result in an improvement or a deterioration of the Company’s business. The Company’s backlog includes only those projects for which the Company has obtained a signed contract with the customer.

The domestic dredging bid market for the quarter ended June 30, 2018 was $359.6 million, a $140.3 million increase compared to the same period in the prior year. For the six months ended June 30, 2018, the domestic dredging bid market was $692.1 million, an increase of $264.8 million, compared to the first six months of 2017. Domestic capital projects awarded during the current year period include the Boston Harbor deepening project, an additional deepening project in Massachusetts, the option on the Charleston entrance channel deepening project and a channel widening project in Texas. Additional domestic projects awarded during the current period include maintenance work in Louisiana and on the West Coast, an LNG project in Texas, coastal protection projects in New York, Florida, South Carolina and North Carolina and rivers & lakes projects in Louisiana and on the Mississippi River. The bid market for the six months ended June 30, 2018 improved over the prior year due to higher amounts of all domestic dredging work types being bid as compared to the same prior year period. For the contracts awarded during the first half of the current year, the Company won 76%, or $135.7 million, of the coastal protection projects, 35%, or $86.0 million, of the domestic capital projects, 4%, or $8.6 million, of the maintenance projects and 23%, or $12.4 million, of rivers & lakes projects through June 30, 2018. The Company won 35% of the overall domestic bid market for the first six months of 2018, which is below the Company’s prior three year average of 46%. Variability in contract wins from quarter to quarter is not unusual and one quarter’s win rate is generally not indicative of the win rate the Company is likely to achieve for a full year.

The Company’s contracted dredging backlog was $506.5 million at June 30, 2018 compared to $511.3 million of backlog at December 31, 2017. These amounts do not reflect approximately $84.2 million of domestic low bids pending formal award and additional phases (“options”) pending on projects currently in backlog at June 30, 2018. At December 31, 2017 the amount of domestic low bids and options pending award was $69.9 million.

Domestic capital dredging backlog at June 30, 2018 was $48.0 million lower than at December 31, 2017. During the first six months of 2018, the Company was awarded the option on the Charleston entrance channel deepening project and a channel widening project in Texas. During the six months ended June 30, 2018, the Company earned revenue on the Charleston entrance channel deepening project, coastal restoration projects in Louisiana and an LNG project in Texas which were in backlog at December 31, 2017.The Company completed work on the multi-year Delaware River and Savannah Harbor deepening projects during the first six months of 2018. Subsequent to the end of the quarter, the Company was awarded a $14 million variation order for deepening work on the Delaware River. Successful expansion of the Panama Canal in recent years continues to put pressure on ports on the East and Gulf Coasts to deepen and widen in anticipation of the neo-Panamax vessels. With several port expansions underway, several other port expansions are entering new phases and several additional projects are being expedited. Deepening projects in Corpus Christi, Jacksonville and Tampa were recently let for bid. Further, projects to deepen the Mississippi River and Port of Virginia are being expedited. The nation’s governors continue to show commitment to their respective ports through engagement and funding.  Finally, Congress has also shown a commitment to ports and waterways, providing record annual budgets for the Corps for port deepening and channel maintenance.

Foreign capital dredging backlog at June 30, 2018 was $4.8 million lower than at December 31, 2017. During the second quarter of 2017, the Company was the low bidder on a $68 million project in Bahrain which the Company expects to be awarded by the third quarter of 2018. During the first six months of 2018, the Company continued to earn revenue on projects in the Middle East which were in backlog at December 31, 2017. During the first quarter of 2018, the Company completed work on a multi-year project in Saudi Arabia. Upcoming projects expected to be awarded are not being completed under the tight time constraints that were required on prior years’ large infrastructure projects. As a result, anticipated margins in the current year are expected to be lower than margins experienced internationally over the past several years. The world’s need for reclaimed land continues to expand to support global energy consumption, seaborne trade, population growth and tourism, all of which are expected to add nearly 400 viable dredging projects over the next several years. The Company expects the additional global opportunities to provide a continued source of future international dredging revenue.

Coastal protection dredging backlog at June 30, 2018 was $53.2 million higher than at December 31, 2017. In the first six months of 2018, the Company was awarded coastal protection projects in Georgia, New York, Virginia, North Carolina and South Carolina totaling approximately $135.7 million. During the first six months of 2018, the Company completed coastal protection projects in New Jersey, South Carolina and Florida which were in backlog at December 31, 2017. Coastal protection and storm impacts continue to provide the major impetus for coastal project investment at federal and state levels. With continued funding available for projects in

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the Northeast from the Sandy supplemental appropriations, the Company expects to continue to see an increase in projects let for bid in the coastal protection market. As a result of the extreme storm system last year involving Hurricanes Harvey, Irma, and Maria, the U.S. Senate Committee on Appropriations passed supplemental appropriations for disaster relief and recovery which includes $17.4 billion for the Corps to fund projects that will reduce the risk of future damage from flood and storm events. The Corps is beginning to provide visibility on their plans for this money, and it is currently believed that over $1 billion is expected to be added to their dredging related budget over the next few years. Most of this work is anticipated to be coastal protection related, but some funding may be provided for channel maintenance.

Maintenance dredging backlog was down $11.4 million from December 31, 2017. During the first six months of 2018, the Company was awarded a maintenance project in Texas. During the first six months of 2018, the Company completed work on projects in Maryland, Mississippi and Delaware which were in backlog at December 31, 2017. The Company continued to earn revenue on a project in Virginia during the first half of 2018. In March 2018, Congress approved and the President signed an omnibus spending bill through fiscal year 2018. The spending bill continues the increases in the budget for the Corps and exceeds the increase in Harbor Maintenance Trust Fund (“HMTF”) spending for maintenance dredging as required by the 2014 Water Resources and Development Act. Further, the water resources development bill, rebranded as the Water Infrastructure Improvements for the Nation Act (“WIIN”) was enacted during the fourth quarter of 2016. WIIN emphasizes previous Water Resources Reform and Development Act (“WRRDA”) language which calls for full use of the HMTF for its intended purpose of maintaining future access to the waterways and ports that support our nation’s economy. Further, WIIN ensures that Harbor Maintenance Tax (“HMT”) funding targets will increase by three percent over the prior year, even if the HMT revenue estimates decrease, to continue annual progress towards full use of the HMT by 2025. Through the increased appropriation of HMTF monies, the Company anticipates an increase in harbor projects to be let for bid throughout 2018 and beyond. In line with their commitment, Congress has improved spending from the HMTF by providing the Corps with record annual budgets including 94% utilization of the HMTF in FY 2018 and 95% proposed in the FY 2019 budget.  

Rivers & lakes backlog at June 30, 2018 increased by $6.1 million from backlog at December 31, 2017. During the second quarter of 2018, the Company was awarded a project in Louisiana. For the six months ended June 30, 2018, the Company continued to earn revenue on projects in New Jersey and Mississippi and on a lake project in Illinois which were in backlog at December 31, 2017. Subsequent to the end of the second quarter, the Company was awarded a $70 million project in Texas which is the first major Houston-area flood-control project after Hurricane Harvey. The project is expected to keep the Company’s rivers & lakes’ equipment occupied into 2019.

Environmental & infrastructure services backlog decreased $6.9 million from December 31, 2017. During the first six months of 2018, the Company was awarded five remediation projects and three geotechnical projects. For the six months ended June 30, 2018, the Company continued to earn revenue on remediation projects in New Jersey, California and Texas which were in backlog at December 31, 2017. Environmental & infrastructure continues to hold focus on geographical expansion of geotechnical service offerings. Additionally, the Company is pursuing remediation opportunities arising from the transformation of the U.S. infrastructure, specifically related to the remediation requirements as mandated by the Environmental Protection Agency’s rule to regulate the disposal of coal combustion residuals from electric utilities promulgated in June 2015. The Company has implemented an aggressive initiative targeting project work in the water management and infrastructure sector, including embankment (dam and levee) rehabilitation, channel maintenance, wetlands and habitat restoration, reservoir construction and maintenance, and shoreline stabilization and reinforcement.

Liquidity and capital resources

The Company’s principal sources of liquidity are net cash flows provided by operating activities, borrowings under the Company’s revolving credit facility and proceeds from previous issuances of long term debt. The Company’s principal uses of cash are to meet debt service requirements, finance capital expenditures, provide working capital and other general corporate purposes.

The Company’s cash provided by operating activities of continuing operations for the six months ended June 30, 2018 and 2017 totaled $25.3 million and $22.6 million, respectively. Normal increases or decreases in the level of working capital relative to the level of operational activity impact cash flow from operating activities. The increase in cash provided by operating activities of continuing operations in the first six months of 2018 compared to the same period in the prior year was driven by a greater investment in working capital during the prior year period.

The Company’s cash flows used in investing activities for the first six months of 2018 and 2017 totaled $1.8 million and $32.1 million, respectively. Investing activities primarily relate to normal course upgrades and capital maintenance of the Company’s dredging fleet. During the first quarter of 2018, the Company received $4.5million in cash proceeds from a sale-leaseback of a dredge. Additionally, during the first half of 2018, the Company received $5.5 million in proceeds from the sale of underperforming

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and underutilized assets identified through the Company’s strategic review. During the six months ended June 30, 2018, the Company spent $1.7 million on the Company’s dual mode articulated tug/barge trailing suction hopper dredge, the Ellis Island, compared to $18.4 million in the same period in the prior year.

The Company’s cash flows provided by (used in) financing activities for the six months ended June 30, 2018 and 2017 totaled $(25.8) million and $26.6 million, respectively. The decrease in cash provided by financing activities primarily relates to the issuance of the Company’s $325 million of 8% senior notes during the second quarter of 2017. The Company used a portion of the net proceeds to redeem its $275 million of 7.375% senior notes and repay a portion of the Company’s revolver during the six months ended June 30, 2017. The Company also paid $4.5 million in financing fees on the issuance of the senior notes during the prior year period. Further, the Company had $24.1 million of repayments on its revolving credit facility during the first six months of 2018 compared to repayments of $18.1 million during the same period of the prior year.

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, CIBC Bank USA, 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 million, subfacilities for the issuance of standby letters of credit up to a $250 million sublimit and swingline loans up to a $25 million 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 million. This increase is subject to lenders providing incremental commitments for such increase, the Credit Parties having adequate borrowing capacity and that no default or event of default exists both before and after giving effect to such incremental commitment increase.

The Credit Agreement also provides for certain actions contemplated in the plan of restructuring with respect to the Company’s 2017 and 2018 fiscal years including allowing up to an aggregate of $20 million of expenses related to the buy-out of operating leases and allowing capital expenditures planned but not incurred by all Credit Parties in fiscal year 2017 to be carried forward to fiscal year 2018; provided that, the aggregate amount of all capital expenditures incurred by all Credit Parties in fiscal years 2017 and 2018 does not exceed $135 million. Additionally, the Credit Agreement contains acknowledgments and agreements from the Agent and the required lenders with respect to certain EBITDA add-backs for fiscal years 2017 and 2018 described therein. Refer to Note 8, Restructuring charges, in the company’s financial statements.

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 Company is required to maintain this ratio if its availability under the Credit Agreement falls below $31.3 million for five consecutive days or $25.0 million for one day. 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 and 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 providers).

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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 publically 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 outstanding under the senior secured revolving credit facility.

As of June 30, 2018, the Company had $70.9 million of borrowings on the revolver and $31.6 million of letters of credit outstanding, resulting in $75.5 million of availability under the Credit Agreement. The availability under the Credit Agreement is suppressed by $72.0 million as of June 30, 2018 as a result of certain additional limitations set forth in the Credit Agreement.

Surety agreements

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 and Liberty Mutual Insurance Company, under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty, Surety Company of America and Zurich American Insurance Company (“Zurich”). Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1 million to $10 million. At June 30, 2018, the Company had outstanding performance bonds totaling approximately $1,245.1 million, of which $41.1 million relates to projects from the Company’s historical environmental & infrastructure businesses. The revenue value remaining in backlog related to these projects totaled approximately $498.1 million.

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 million 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 $20.9 million. 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 11, Business dispositions, to the Company’s condensed consolidated financial statements.

Senior notes

In May 2017, the Company issued $325 million in aggregate principal amount of its 8% senior notes (“8% Senior Notes”) due May 15, 2022. Approximately $283 million of the net proceeds from the issuance of the 8% Senior Notes were used to prepay all of the Company’s 7.375% senior notes due February 2019, including a tender premium and accrued and unpaid interest. Interest on the 8% Senior Notes is payable semi-annually in arrears on May 15 and November 15 of each year, beginning on November 15, 2017. The 8% Senior Notes are senior unsecured obligations of the Company and will be guaranteed on a senior unsecured basis by the guarantors and any other subsidiary guarantors that from time to time become parties to the indenture. The terms of the indenture, among other things, limit the ability of the Company and its restricted subsidiaries to (i) pay dividends, or make certain other restricted payments or investments; (ii) incur additional indebtedness and issue disqualified stock; (iii) create liens on their assets; (iv) transfer and sell assets; (v) enter into certain business combinations with third parties or into certain other transactions with affiliates; (vi) create restrictions on dividends or other payments by the Company’s restricted subsidiaries; and (vii) create guarantees of indebtedness by restricted subsidiaries. These covenants are subject to a number of important limitations and exceptions that are described in the indenture.

Other

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The impact of changes in functional currency exchange rates against the U.S. dollar on non-U.S. dollar cash balances, primarily the Australian Dollar, is reflected in the cumulative translation adjustment—net within accumulated other comprehensive loss. Cash held in non-U.S. dollar currencies primarily is used for project-related and other operating costs in those currencies reducing the Company’s exposure to future realized exchange gains and losses.

The Company believes its cash and cash equivalents, its anticipated cash flows from operations and availability under its revolving credit facility will be sufficient to fund the Company’s operations, capital expenditures and the scheduled debt service requirements for the next twelve months. Beyond the next twelve months, the Company’s ability to fund its working capital needs, planned capital expenditures, scheduled debt payments and dividends, if any, and to comply with all the financial covenants under the Credit Agreement and bonding agreement, depends on its future operating performance and cash flows, which in turn, are subject to prevailing economic conditions and to financial, business and other factors, some of which are beyond the Company’s control.

Critical accounting policies and estimates

In preparing its consolidated financial statements, the Company follows GAAP, which is described in Note 1, Basis of presentation, to the Company’s December 31, 2017 Consolidated Financial Statements included on Form 10-K. The application of these principles requires significant judgments or an estimation process that can affect the results of operations, financial position and cash flows of the Company, as well as the related footnote disclosures. The Company continually reviews its accounting policies and financial information disclosures. Except as noted in Note 1, Basis of presentation, of the company’s financial statements, there have been no material changes in the Company’s critical accounting policies or estimates since December 31, 2017.

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

The market risk of the Company’s financial instruments as of June 30, 2018 has not materially changed since December 31, 2017. The market risk profile of the Company on December 31, 2017 is disclosed in Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

Item 4. Controls and Procedures.

a) Evaluation of disclosure controls and procedures.

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Company’s disclosure controls and procedures, as required by Rule 13a-15(b) and 15d-15(b) under the Securities Exchange Act of 1934 (the “Exchange Act”) as of June 30, 2018. Our disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports that we file or submit under the Exchange Act a) is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding disclosure and b) is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

Our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of June 30, 2018 in providing such a reasonable assurance.

b) Changes in internal control over financial reporting.

There have been no changes in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) during the fiscal quarter ended June 30, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

33

PART II — Other Information

Item 1. Legal Proceedings.

See Note 9, Commitments and contingencies, in the Notes to Condensed Consolidated Financial Statements.

Item 1A. Risk Factors.

There have been no material changes, except for the following, during the six months ended June 30, 2018 to the risk factors previously disclosed in Item 1A. “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

New tariffs have resulted in increased prices and could adversely affect our business operations, revenues and profits.

Recently, the United States imposed Section 232 tariffs on certain steel and aluminum products, such as imported dredge-related machinery and pipes. These tariffs have increased the prices of these inputs. Increased prices for imported steel and aluminum products have lead domestic sellers to respond with market-based increases to prices for such inputs as well. We cannot be sure of the ultimate effect such tariffs or any additional tariffs will have on our operating profits. If we are not able to pass these price increases on to our customers or to secure adequate alternative sources for such inputs on a timely basis, the tariffs may have a material adverse effect on our business operations, revenues and profits.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

None.

Item 3. Defaults Upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information

None.

34

Item 6. Exhibits

31.1	Certification Pursuant to Rules 13a-14 and 15d-14 under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. *
31.2	Certification Pursuant to Rules 13a-14 and 15d-14 under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. *
32.1	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. **
32.2	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. **
101.INS	XBRL Instance Document. *
101.SCH	XBRL Taxonomy Extension Schema. *
101.CAL	XBRL Taxonomy Extension Calculation Linkbase. *
101.DEF	XBRL Taxonomy Extension Definition Linkbase. *
101.LAB	XBRL Taxonomy Extension Label Linkbase. *
101.PRE	XBRL Taxonomy Extension Presentation Linkbase. *
* Filed herewith
** Furnished herewith

35

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Great Lakes Dredge & Dock Corporation
(registrant)
By:	/s/  Mark W. Marinko
	Mark W. Marinko
	Senior Vice President and Chief Financial Officer
	(Principal Financial and Accounting Officer and Duly Authorized Officer)

Date:  August 1, 2018

36

EX-31.1

Exhibit 31.1

CERTIFICATIONS PURSUANT TO

SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

CERTIFICATION

I, Lasse J. Petterson, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Great Lakes Dredge & Dock Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 1, 2018

/s/ Lasse J. Petterson

Lasse J. Petterson

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS PURSUANT TO

SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

CERTIFICATION

I, Mark W. Marinko, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Great Lakes Dredge & Dock Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 1, 2018

/s/ Mark W. Marinko

Mark W. Marinko

Senior Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Great Lakes Dredge & Dock Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lasse J. Petterson, Chief Executive Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by Great Lakes Dredge & Dock Corporation for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

/s/ Lasse J. Petterson

Lasse J. Petterson

Chief Executive Officer

Date: August 1, 2018

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Great Lakes Dredge & Dock Corporation and will be retained by Great Lakes Dredge & Dock Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Great Lakes Dredge & Dock Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark W. Marinko, Senior Vice President and Chief Financial Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by Great Lakes Dredge & Dock Corporation for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

/s/ Mark W. Marinko

Mark W. Marinko

Senior Vice President and Chief Financial Officer

Date: August 1, 2018

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Great Lakes Dredge & Dock Corporation and will be retained by Great Lakes Dredge & Dock Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 27, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
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		62,305,408

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 13,538	$ 15,852
Accounts receivable—net	82,306	75,533
Contract revenues in excess of billings	55,003	90,788
Inventories	32,340	34,600
Prepaid expenses and other current assets	40,947	45,411
Total current assets	224,134	262,184
PROPERTY AND EQUIPMENT—Net	371,807	407,294
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,186	84,484
INVENTORIES—Noncurrent	55,200	54,023
INVESTMENTS IN JOINT VENTURES	3,489	2,714
ASSETS HELD FOR SALE—Noncurrent	6,916	8,530
OTHER	12,473	13,128
TOTAL	758,205	832,357
LIABILITIES AND EQUITY
Accounts payable	68,751	87,659
Accrued expenses	45,943	56,218
Billings in excess of contract revenues	9,050	3,615
Current portion of long-term debt	1,169	2,758
Total current liabilities	124,913	150,250
LONG-TERM DEBT	321,503	333,141
REVOLVING CREDIT FACILITY	70,882	95,000
DEFERRED INCOME TAXES	21,896	25,561
OTHER	7,497	7,109
Total liabilities	546,691	611,061
COMMITMENTS AND CONTINGENCIES (Note 9)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 62,583 and 61,897 shares issued; 62,305 and 61,619 shares outstanding at June 30, 2018 and December 31, 2017, respectively.	6	6
Treasury stock, at cost	(1,433)	(1,433)
Additional paid-in capital	291,468	289,821
Accumulated deficit	(78,973)	(67,101)
Accumulated other comprehensive income	446	3
Total equity	211,514	221,296
TOTAL	$ 758,205	$ 832,357

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	62,583,000	61,897,000
Common stock, shares outstanding	62,305,000	61,619,000

XML

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Contract revenues	$ 150,590	$ 176,859	$ 297,183	$ 347,445
Type of Revenue [Extensible List]	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember
Costs of contract revenues	$ 128,350	$ 156,577	$ 260,238	$ 312,351
Type of Cost, Good or Service [Extensible List]	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember
Gross profit	$ 22,240	$ 20,282	$ 36,945	$ 35,094
General and administrative expenses	15,169	17,267	31,113	34,062
(Gain) loss on sale of assets—net	(1,063)	169	(1,262)	180
Operating income	8,134	2,846	7,094	852
Interest expense—net	(8,997)	(6,441)	(17,657)	(12,023)
Equity in loss of joint ventures		(1,468)		(1,467)
Loss on extinguishment of debt		(2,330)		(2,330)
Other expense	(57)	(285)	(2,973)	(77)
Loss from continuing operations before income taxes	(920)	(7,678)	(13,536)	(15,045)
Income tax (provision) benefit	(54)	3,454	3,241	6,247
Loss from continuing operations	(974)	(4,224)	(10,295)	(8,798)
Income (loss) from discontinued operations, net of income taxes		368		(12,697)
Net loss	$ (974)	$ (3,856)	$ (10,295)	$ (21,495)
Basic loss per share attributable to continuing operations	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.14)
Basic loss per share attributable to discontinued operations, net of tax				(0.21)
Basic loss per share	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.35)
Basic weighted average shares	62,267	61,342	62,041	61,204
Diluted loss per share attributable to continuing operations	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.14)
Diluted loss per share attributable to discontinued operations, net of tax				(0.21)
Diluted loss per share	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.35)
Diluted weighted average shares	62,267	61,342	62,041	61,204

XML

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (974)	$ (3,856)	$ (10,295)	$ (21,495)
Currency translation adjustment—net of tax	[1]	(57)	6	1,304	(22)
Net unrealized gain on derivatives—net of tax	[2]	(127)	(718)	(861)	(1,452)
Other comprehensive income (loss)—net of tax		(184)	(712)	443	(1,474)
Comprehensive loss		$ (1,158)	$ (4,568)	$ (9,852)	$ (22,969)

[1] Net of income tax (provision) benefit of $5 and $(6) for the three months ended June 30, 2018 and 2017, respectively. Net of income tax (provision) benefit of $(530) and $33 for the six months ended June 30, 2018 and 2017, respectively.

[2] Net of income tax provision of $689 and $468 for the three months ended June 30, 2018 and 2017, respectively. Net of income tax provision of $949 and $947 for the six months ended June 30, 2018 and 2017, respectively.

XML

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ 5	$ (6)	$ (530)	$ 33
Net unrealized gain on derivatives, tax	$ 689	$ 468	$ 949	$ 947

XML

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 Income (loss) [Member]
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	(21,495)				(21,495)
Other comprehensive income (loss)—net of tax	(1,474)					(1,474)
BALANCE - value at Jun. 30, 2017	226,785	$ 6	$ (1,433)	288,167	(57,336)	(2,619)
BALANCE - shares at Jun. 30, 2017		61,683	(278)
BALANCE - value at Dec. 31, 2017	221,296	$ 6	$ (1,433)	289,821	(67,101)	3
BALANCE - shares at Dec. 31, 2017		61,897	(278)
Cumulative effect of recent accounting pronouncements	(1,577)				(1,577)
Share-based compensation, value	2,264			2,264
Share-based compensation, shares		72
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(1,060)			(1,060)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		486
Exercise of options and purchases from employee stock plans, value	443			443
Exercise of options and purchases from employee stock plans, shares		128
Net loss	(10,295)				(10,295)
Other comprehensive income (loss)—net of tax	443					443
BALANCE - value at Jun. 30, 2018	$ 211,514	$ 6	$ (1,433)	$ 291,468	$ (78,973)	$ 446
BALANCE - shares at Jun. 30, 2018		62,583	(278)

XML

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES:
Net loss	$ (10,295)	$ (21,495)
Income (loss) from discontinued operations, net of income taxes		(12,697)
Loss from continuing operations	(10,295)	(8,798)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Depreciation and amortization	28,981	27,501
Equity in earnings of joint ventures	(1,313)	(3,087)
Cash distributions from joint ventures	538	4,486
Loss on extinguishment of 7 3/8% senior notes		2,330
Deferred income taxes	(2,850)	(6,277)
(Gain) loss on sale of assets—net	(1,262)	180
Other non-cash restructuring items	2,015
Amortization of deferred financing fees	1,769	1,646
Unrealized net loss from mark-to-market valuations of derivatives		1,089
Unrealized foreign currency gain	(201)	(115)
Share-based compensation expense	2,264	1,758
Changes in assets and liabilities:
Accounts receivable	(2,297)	26,126
Contract revenues in excess of billings	32,823	4,212
Inventories	1,083	(1,536)
Prepaid expenses and other current assets	11,361	6,169
Accounts payable and accrued expenses	(30,348)	(34,498)
Billings in excess of contract revenues	(2,249)	51
Other noncurrent assets and liabilities	(4,743)	1,379
Net cash flows provided by operating activities from continuing operations	25,276	22,616
Net cash flows used in operating activities of discontinued operations		(20,900)
Cash provided by operating activities	25,276	1,716
INVESTING ACTIVITIES:
Purchases of property and equipment	(11,790)	(34,266)
Proceeds from dispositions of property and equipment	9,979	2,212
Cash used in investing activities	(1,811)	(32,054)
FINANCING ACTIVITIES:
7 3/8% senior notes tender premium		(744)
Deferred financing fees		(4,519)
Repayments of debt	(1,070)	(276,386)
Proceeds from issuance of debt		326,241
Taxes paid on settlement of vested share awards	(1,060)	(328)
Exercise of options and purchases from employee stock plans	443	434
Borrowings under revolving loans	18,000	52,046
Repayments of revolving loans	(42,118)	(70,157)
Cash provided by (used in) financing activities	(25,805)	26,587
Effect of foreign currency exchange rates on cash and cash equivalents	26	64
Net decrease in cash, cash equivalents and restricted cash	(2,314)	(3,687)
Cash, cash equivalents and restricted cash at beginning of period	17,352	19,702
Cash, cash equivalents and restricted cash at end of period	15,038	16,015
Supplemental Cash Flow Information
Cash paid for interest	16,245	19,835
Cash paid for income taxes	243	555
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	5,220	$ 4,578
Repayments of debt with proceeds from sale-leaseback transactions	$ 13,034

XML

Condensed Consolidated Statements Of Cash Flows (Parenthetical)	Jun. 30, 2018	Jun. 30, 2017	May 31, 2017
7 3/8% SENIOR NOTES [Member]
Debt instrument, interest rate, stated percentage	7.375%	7.375%	7.375%

XML

Basis Of Presentation

6 Months Ended

Jun. 30, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis Of Presentation

1. Basis of presentation

The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Great Lakes Dredge & Dock Corporation and Subsidiaries (the “Company” or “Great Lakes”) and the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. 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, 2018, and its results of operations for the three and six months ended June 30, 2018 and 2017 and cash flows for the six months ended June 30, 2018 and 2017 have been included.

The Company adopted Accounting Standard Update No. 2016-18 (“ASU 2016-18”), Statement of Cashflows (Topic 230): Restricted Cash on January 1, 2018. 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 impact of the adoption of ASU 2016-18 has been applied retrospectively and the prior period presented has been recast.

The following table provides a reconciliation of cash, cash equivalents and restricted cash at June 30, 2018 and December 31, 2017 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statements of Cash Flows.

	June 30, 2018		December 31, 2017
Cash and cash equivalents	$	13,538	$	15,852
Restricted cash included in other long-term assets		1,500		1,500
Cash, cash equivalents and restricted cash at end of period	$	15,038	$	17,352

Effective beginning the first quarter of 2018, the Company changed the method of accounting for allocated fixed equipment costs for interim periods such that fixed equipment costs are now recognized as incurred. The Company adopted this change as a result of management’s belief that the new method is preferable and results in a more objective measure of quarterly expense that will better support planning and resource allocation decisions by management. The change has been applied retrospectively and all prior interim periods presented have been recast. The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. Previously, the Company allocated fixed equipment costs to interim periods in proportion to revenues recognized over the year. Specifically, at each interim reporting date the Company compared actual revenues earned to date on its dredging contracts to expected annual revenues and recognized 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 impact of the change in accounting policy on our Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets is as follows:

	Three Months Ended			Six Months Ended
	June 30, 2017			June 30, 2017
Costs of contract revenues	$	5,492		$	6,862
Income tax benefit		2,330			2,849
Loss from continuing operations		(3,162	)		(4,013	)
Net loss	$	(3,162	)	$	(4,013	)
Comprehensive loss	$	(3,162	)	$	(4,013	)
Basic loss per share attributable to continuing operations	$	(0.05	)	$	(0.06	)
Diluted loss per share attributable to continuing operations	$	(0.05	)	$	(0.06	)

	June 30, 2017
Prepaid expenses and other current assets	$	(6,862	)
Deferred income taxes		(2,849	)
Accumulated deficit	$	(4,013	)

The Company adopted 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”) on January 1, 2018 under the modified retrospective method such that the cumulative effect is recognized at the date of initial application. The adoption of ASC 606 may result in a change in the timing of recognition of both contract revenue and costs from our prior practices. Upon the adoption of ASC 606, the Company recorded a cumulative net adjustment of $1,950 to the beginning retained earnings balance. Refer to Note 7, Revenue, for further discussion of the adoption of ASC 606.

In February 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2018-02 (“ASU 2018-02”), Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The new guidance allows entities to reclassify from accumulated other comprehensive income to retained earnings stranded tax effects resulting from the Tax Cut and Jobs Act. The Company elected to early adopt ASU 2018-02 during the quarter ended March 31, 2018.

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 has two operating segments: dredging and environmental & infrastructure, which are also the Company’s reportable segments and reporting units of which the Company tests goodwill for impairment. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2018.

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 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 February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) and subsequently issued other Accounting Standard Updates related to the Accounting Standards Codification Topic 842 (collectively, “ASC 842”). The FASB issued ASC 842 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’s evaluation of ASC 842 is ongoing and not complete. The Company is currently evaluating the overall impacts that ASC 842 will have on the classification of leases and resulting pattern of expense recognition in the income statement, existing internal controls and processes to comply with the guidance. Accordingly, the Company is still evaluating the effect of the adoption of ASC 842 on its consolidated financial statements.

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Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

2. Earnings per share

Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings per share is computed the same as 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.

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

	Three Months Ended						Six Months Ended
(shares in thousands)	June 30,						June 30,
	2018			2017			2018			2017
Loss from continuing operations	$	(974	)	$	(4,224	)	$	(10,295	)	$	(8,798	)
Income (loss) from discontinued operations, net of income taxes		—			368			—			(12,697	)
Net loss		(974	)		(3,856	)		(10,295	)		(21,495	)
Weighted-average common shares outstanding — basic		62,267			61,342			62,041			61,204
Effect of stock options and restricted stock units		—			—			—			—
Weighted-average common shares outstanding — diluted		62,267			61,342			62,041			61,204
Loss per share from continuing operations — basic	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)
Loss per share from continuing operations — diluted	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)

For the quarter and year ended June 30, 2018 and 2017, the following stock options and restricted stock units were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during these periods:

	Three Months Ended				Six Months Ended
(shares in thousands)	June 30,				June 30,
	2018		2017		2018		2017
Effect of stock options and restricted stock units		429		603		920		654

For the quarter and year ended June 30, 2018 and 2017, the following stock options and restricted stock units were excluded from the calculation of diluted earnings per share as such stock options and restricted stock units were determined to be anti-dilutive:

	Three Months Ended				Six Months Ended
(shares in thousands)	June 30,				June 30,
	2018		2017		2018		2017
Effect of stock options and restricted stock units		1,495		1,331		1,524		1,455

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Accrued Expenses

6 Months Ended

Jun. 30, 2018

Payables And Accruals [Abstract]

Accrued Expenses

3. Accrued expenses

Accrued expenses at June 30, 2018 and December 31, 2017 are as follows:

	June 30,		December 31,
	2018		2017
Insurance	$	14,357	$	22,941
Payroll and employee benefits		8,078		8,747
Accrued rent		5,417		6,519
Interest		3,853		4,210
Percentage of completion adjustment		3,302		3,591
Income and other taxes		2,341		2,794
Other		8,595		7,416
Total accrued expenses	$	45,943	$	56,218

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Long-term Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

4. 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, CIBC Bank USA, 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 that no default or event of default exists both before and after giving effect to such incremental commitment increase.

The Credit Agreement also provides for certain actions contemplated in the plan of restructuring with respect to the Company’s 2017 and 2018 fiscal years including allowing up to an aggregate of $20,000 of expenses related to the buy-out of operating leases and allowing capital expenditures planned but not incurred by all Credit Parties in fiscal year 2017 to be carried forward to fiscal year 2018; provided that, the aggregate amount of all capital expenditures incurred by all Credit Parties in fiscal years 2017 and 2018 does not exceed $135,000. Additionally, the Credit Agreement contains acknowledgments and agreements from the Agent and the required lenders with respect to certain EBITDA add-backs for fiscal years 2017 and 2018 described therein. See Note 8, Restructuring charges.

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 Company is required to maintain this ratio if its availability under the Credit Agreement falls below $31,250 for five consecutive days or $25,000 for one day. 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 and 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, 2018, the Company had $70,882 of borrowings on the revolver, $31,587 of letters of credit outstanding and $75,520 of availability under the Credit Agreement. The availability under the Credit Agreement is suppressed by $72,011 as of June 30, 2018 as a result of certain additional limitations set forth in the Credit Agreement.

Senior Notes and subsidiary guarantors

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.

The Company’s obligations under these Senior Notes are guaranteed by certain of the Company’s 100% owned domestic subsidiaries. Such guarantees are full, unconditional and joint and several. The parent company issuer has no independent assets or operations and all non-guarantor subsidiaries have been determined to be minor.

Other

The Company enters into note arrangements to finance certain vessels and ancillary equipment. The current portion of all equipment notes is $1,169. The long-term portion is $376 and is included in notes payable or other long-term liabilities. In February 2018, the Company completed a sale-leaseback of a vessel yielding net proceeds of $4,500. Included in this transaction was the retirement of the asset and related equipment note, and the transaction resulted in a deferred gain that will be amortized over the life of the lease.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

5. 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, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	1,335	$	—		1,335	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 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	$	2,501	$	—	$	2,501	$	—

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 could 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, 2018, 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 June 2019. As of June 30, 2018, there were 5.2 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through June 2019. Under these swap agreements, the Company will pay fixed prices ranging from $1.74 to $2.23 per gallon.

At June 30, 2018 and December 31, 2017, the fair value assets of the fuel hedge contracts were estimated to be $1,335 and $2,501, respectively, and are recorded in prepaid expenses and other current assets. For fuel hedge contracts considered to be highly effective, the gains reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the six months ended June 30, 2018 were $1,769. The remaining gains and losses included in accumulated other comprehensive loss at June 30, 2018 will be reclassified into earnings over the next twelve 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, 2018 and December 31, 2017 is as follows:

		Fair Value at
		June 30,		December 31,
	Balance Sheet Location	2018		2017
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	1,335	$	2,501

Accumulated other comprehensive income

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,
	2018			2017			2018			2017
Cumulative translation adjustments—net of tax	$	(57	)	$	6		$	1,304		$	(22	)
Derivatives:
Reclassification of derivative (gains) losses to earnings—net of tax		(1,037	)		155			(1,769	)		195
Change in fair value of derivatives—net of tax		910			(873	)		908			(1,647	)
Net unrealized gain on derivatives—net of tax		(127	)		(718	)		(861	)		(1,452	)
Total other comprehensive income (loss)	$	(184	)	$	(712	)	$	443		$	(1,474	)

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	2018			2017		2018			2017
Derivatives:
Fuelhedge contracts	Costs of contract revenues	$	(1,404	)	$	257	$	(2,396	)	$	323
	Income tax (provision) benefit		(367	)		102		(627	)		128
		$	(1,037	)	$	155	$	(1,769	)	$	195

The Company substantially completed the closeout of its Brazil operations, during the first quarter of 2018. This liquidation resulted in the reversal of the Company’s cumulative translation adjustment of $2,015, recorded during the first quarter of 2018, related to Brazil which is included in other expense in the Condensed Consolidated Statements of Operations.

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, 2018, refer to Note 4, Long-term debt. 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 $332,313 at June 30, 2018, 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.

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Share-Based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

6. 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, 2018, the Company granted 1,976 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 or restricted stock units. Compensation cost charged to expense related to share-based compensation arrangements was $1,255 and $840 for the three months ended June 30, 2018 and 2017, respectively, and $2,264 and $1,758 for the six months ended June 30, 2018 and 2017, respectively.

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Revenue

6 Months Ended

Jun. 30, 2018

Revenue From Contract With Customer [Abstract]

Revenue

7. Revenue

The Company’s revenue is derived from contracts for services with federal, state, local and foreign governmental entities and private customers. Dredging revenues are generally derived from the enhancement or preservation of navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Revenues within the environmental & infrastructure segment are generally generated from environmental and geotechnical construction as well as soil, water and sediment environmental remediation.

Previously, the Company measured completion based on engineering estimates of the physical percentage completed for dredging contracts and based upon cost incurred to date compared to total estimated costs, also known as cost-to-cost, for environmental & infrastructure contracts. Under the new accounting principle, the Company measures progress toward completion on all contracts utilizing the cost-to-cost method. Additionally, the Company capitalizes certain pre-contract and pre-construction costs, and defers recognition over the life of the contract. At June 30, 2018, the impact of this change in accounting principle on the Condensed Consolidated Balance Sheets is as follows:

	June 30, 2018
ASSETS
Contract revenues in excess of billings	$	(19,353	)
Other current assets		10,310
Other		5,012
LIABILITIES AND EQUITY
Accrued expenses		(547	)
Billings in excess of contract revenues		2,259
Deferred taxes		(1,493	)
Accumulated deficit	$	(4,250	)

For the three and six months ended June 30, 2018, the impact of this change in accounting principle on the Condensed Consolidated Statements of Operations is as follows:

	Three Months Ended			Six Months Ended
	June 30,			June 30,
	2018			2018
Contract revenues	$	(12,951	)	$	(21,612	)
Cost of contract revenues		(9,174	)		(15,869	)
Income tax benefit		982			1,493
Loss from continuing operations		(2,795	)		(4,250	)
Net loss	$	(2,795	)	$	(4,250	)
Comprehensive loss	$	(2,795	)	$	(4,250	)

Performance obligations

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account upon which the Company’s revenue is calculated. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue as the performance obligation is satisfied. Fixed-price contracts, which comprise substantially all of the Company’s revenue, will most often represent a single performance obligation as the promise to transfer the individual services is not separately identifiable from other promises in the contracts and, therefore, not distinct.

The Company capitalizes certain pre-contract and pre-construction costs, and defers recognition over the life of the contract. The Company’s performance obligations are satisfied over time and revenue is recognized using contract fulfillment costs incurred to date compared to total estimated costs at completion, also known as cost-to-cost, to measure progress towards completion. As the Company’s performance creates an asset that customer controls, this method provides a faithful depiction of the transfer of an asset to the customer. Generally, the Company has an enforceable right to payment for performance completed to date.

The dredging and environmental & infrastructure segments typically satisfy their performance obligations upon completion of service. The majority of the Company’s contracts are completed in a year or less. At June 30, 2018, the Company had $534,965 of remaining performance obligations, which the Company refers to as total backlog. Approximately 52% of the Company’s backlog will be completed in 2018 with the remaining balance expected to be completed by 2020.

Transaction price

The transaction price is calculated using the Company’s estimated costs to complete a project. These costs are based on the types of equipment required to perform the specified service, project site conditions, the estimated project duration, seasonality, location and complexity of a project.

The nature of the Company’s contracts gives rise to several types of variable consideration, including pay on quantity dredged for dredging projects and contract modifications for both dredging and environmental & infrastructure projects. For dredging projects, estimated pay quantity is the amount of material the Company expects to dredge for which it will receive payment. Estimated quantity to be dredged is calculated using engineering estimates based on current survey data and the Company’s knowledge based on historical project experience. Contract modifications are changes in the scope or price (or both) of a contract that are approved by the parties to the contract. The Company recognizes a contract modification when the parties to a contract approve a modification that either creates new, or changes existing, enforceable rights and obligations of the parties to the contract. Contract modifications are included in the transaction price only if it is probable that the modification estimate will not result in a significant reversal of revenue. Contract modifications are routine in the performance of the Company’s contracts. In most instances, contract modifications are for services that are not distinct, and, therefore, are accounted for as part of the existing contract.

Revisions in estimated gross profit percentages are recorded in the period during which the change in circumstances is experienced or becomes known. As the duration of most of the Company’s contracts is one year or less, the cumulative net impact of these revisions in estimates, individually and in the aggregate across our projects, does not significantly affect our results across annual reporting periods. Provisions for estimated losses on contracts in progress are made in the period in which such losses are determined.

Revenue by category

The following series of tables presents our revenue disaggregated by several categories.

Domestically, our work generally is performed in coastal waterways and deep water ports. The U.S. dredging market consists of four primary types of work: capital, coastal protection, maintenance and rivers & lakes.Foreign projects typically involve capital work.

The following table sets forth, by segment and type of work, the Company’s contract revenues for the periods ended:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Revenues (in thousands)	2018		2017			2018		2017
Dredging:
Capital—U.S.	$	69,651	$	31,472		$	146,603	$	98,073
Capital—foreign		3,279		12,420			8,802		31,574
Coastal protection		38,121		60,304			79,982		100,639
Maintenance		19,077		34,337			26,880		56,250
Rivers & lakes		5,142		13,974			6,626		19,025
Total dredging revenues		135,270		152,507			268,893		305,561
Environmental & infrastructure		15,320		24,711			28,290		43,935
Intersegment revenue		—		(359	)		—		(2,051	)
Total revenues	$	150,590	$	176,859		$	297,183	$	347,445

The following table sets forth, by segment and type of customer, the Company’s contract revenues for the periods ended:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Revenues (in thousands)	2018		2017			2018		2017
Dredging:
Federal government	$	92,913	$	83,632		$	169,607	$	195,126
State and local government		23,346		45,027			69,971		60,672
Private		15,732		11,428			20,513		18,189
Foreign		3,279		12,420			8,802		31,574
Total dredging revenues		135,270		152,507			268,893		305,561
Environmental & infrastructure:
Private		11,037		10,961			17,401		21,496
Other		4,283		13,750			10,889		22,439
Intersegment revenue		—		(359	)		—		(2,051	)
Total revenues	$	150,590	$	176,859		$	297,183	$	347,445

Foreign dredging revenue was $3,279 and $12,420 for the three months ended June 30, 2018 and 2017, respectively, and $8,802 and $31,574 for the six months ended June 30, 2018 and 2017, respectively, and was mostly attributable to work done in the Middle East.

Contract balances

Billings on contracts are generally submitted after verification with the customers of physical progress and are recognized as accounts receivable in the balance sheet. For billings that do not match the timing of revenue recognition, the difference between amounts billed and recognized as revenue is reflected in the balance sheet as either contract revenues in excess of billings or billings in excess of contract revenues. Certain pre-contract and pre-construction costs are capitalized and reflected as contract assets in the balance sheet. Customer advances, deposits and commissions are reflected in the balance sheet as contract liabilities.

Accounts receivable at June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
	2018			2017
Completed contracts	$	13,859		$	15,974
Contracts in progress		50,302			42,759
Retainage		18,575			21,866
		82,736			80,599
Allowance for doubtful accounts		(430	)		(591	)
Total accounts receivable—net	$	82,306		$	80,008
Current portion of accounts receivable—net	$	82,306		$	75,533
Long-term accounts receivable and retainage		—			4,475
Total accounts receivable—net	$	82,306		$	80,008

The components of contracts in progress at June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
	2018			2017
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	482,780		$	558,557
Amounts billed		(447,617	)		(490,732	)
Costs and earnings in excess of billings for contracts in progress		35,163			67,825
Costs and earnings in excess of billings for completed contracts		19,840			22,963
Total contract revenues in excess of billings	$	55,003		$	90,788
Billings in excess of costs and earnings:
Amounts billed	$	(219,428	)	$	(325,350	)
Costs and earnings for contracts in progress		210,378			321,735
Total billings in excess of contract revenues	$	(9,050	)	$	(3,615	)

The Company has $17,693 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 costs incurred related to this project. Additionally, the timing of realization may be impacted by the timing of a delay in the sale of these environmental credits, requiring a longer period required to recover our investment.

For amounts included in billings in excess of contract revenues balance at the beginning of the year, the Company recognized nearly all of the related revenue during the six months ended June 30, 2018.

At June 30, 2018 and January 1, 2018, costs to fulfill contracts with customers recognized as an asset were $16,300 and $7,732, respectively, and are recorded in other current assets and other noncurrent assets. These costs relate to pre-contract and pre-construction activities. During the three and six months ended June 30, 2018, the company amortized $4,299 and $6,796 of pre-construction costs, respectively.

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Restructuring Charges

6 Months Ended

Jun. 30, 2018

Restructuring And Related Activities [Abstract]

Restructuring Charges

8. Restructuring charges

In 2017, a strategic review was begun to improve the Company’s financial results in both domestic and international operations enabling debt reduction, improvements in return on capital and the continued renewal of our extensive fleet with new and efficient dredges to best serve our domestic and international clients. As a result of this review, management began execution of a plan to reduce general and administrative and overhead expenses, retire certain underperforming and underutilized assets, write-off pre-contract costs on a project that was never formally awarded and that the Company no longer intends to pursue and closeout the Company’s Brazil operations. These changes will result in total restructuring charges of approximately $42,000-$47,000, including severance of approximately $3,000, asset retirements of approximately $30,000-$34,000, pre-contract costs of approximately $6,500 and closeout costs of approximately $2,500-$3,500.

Approximately $38,000-$43,000 of this charge consists of non-cash items including depreciation, loss on sale of assets and other items, approximating totals of $12,500-$14,500, $3,000-$5,000 and $21,500-$23,500, respectively. The majority of the charge was recorded in the second half of 2017 with the remainder to be recognized in the dredging segment in 2018.

Restructuring charges currently recognized for the above actions are summarized as follows:

	Three Months Ended			Six Months Ended
	June 30, 2018			June 30, 2018
Costs of contract revenues - depreciation	$	1,676		$	4,668
Costs of contract revenues - other		(274	)		993
General and administrative expenses		(28	)		(21	)
Gain on sale of assets—net		(840	)		(847	)
Other expense		—			2,015
Total Dredging		534			6,808
General and administrative expenses		(9	)		159
Total Environmental & Infrastructure		(9	)		159
Costs of contract revenues - depreciation		1,676			4,668
Costs of contract revenues - other		(274	)		993
General and administrative expenses		(37	)		138
Gain on sale of assets—net		(840	)		(847	)
Other expense		—			2,015
Total Consolidated	$	525		$	6,967

The Company accrued rent expense of $4,959 and $5,930 and severance expense of $849 and $1,567 at June 30, 2018 and December 31, 2017, respectively. Both of these items are included in accrued expenses at June 30, 2018 and December 31, 2017 and are expected to be settled in 2018.

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Commitments And Contingencies

6 Months Ended

Jun. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Commitments And Contingencies

9. 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 and Liberty Mutual Insurance Company, under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty, Surety Company of America and Zurich American Insurance Company (“Zurich”). 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, 2018, the Company had outstanding performance bonds with a notional amount of approximately $1,245,099 of which $41,085 relates to projects from the Company’s historical environmental & infrastructure businesses. The revenue value remaining in backlog related to these projects totaled approximately $498,059.

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 11, Business dispositions.

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 U.S. federal government, the U.S. federal 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 U.S. federal 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.

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Investments

6 Months Ended

Jun. 30, 2018

Equity Method Investments And Joint Ventures [Abstract]

Investments

10. Investments

The Company owned 50% of TerraSea Environmental Solutions (“TerraSea”) as a joint venture. TerraSea was engaged in the environmental services business through its ability to remediate contaminated soil and dredged sediment treatment. 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. TerraSea was dissolved in the third quarter of 2017.

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Business Combinations And Dispositions

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Business Combinations And Dispositions

11. 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 9, Commitments and contingencies, 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 three and 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 $11,400and will be determined based on the attainment of an average Adjusted EBITDA target of Magnus, now referred to as Great Lakes E&I, 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, Great Lakes E&I is not expected to reach the minimum Adjusted EBITDA threshold designated in the amended share purchase agreement.

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Segment Information

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Information

12. 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,
	2018			2017			2018			2017
Dredging
Contract revenues	$	135,270		$	152,507		$	268,893		$	305,561
Operating income		11,567			2,989			13,745			3,725
Environmental & infrastructure
Contract revenues	$	15,320		$	24,711		$	28,290		$	43,935
Operating loss		(3,433	)		(143	)		(6,651	)		(2,873	)
Intersegment revenues	$	—		$	(359	)	$	—		$	(2,051	)
Total
Contract revenues	$	150,590		$	176,859		$	297,183		$	347,445
Operating income		8,134			2,846			7,094			852

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Basis Of Presentation (Policies)

6 Months Ended

Jun. 30, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Recent Accounting Pronouncements

Recent accounting pronouncements

In January 2017, the 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 February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) and subsequently issued other Accounting Standard Updates related to the Accounting Standards Codification Topic 842 (collectively, “ASC 842”). The FASB issued ASC 842 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’s evaluation of ASC 842 is ongoing and not complete. The Company is currently evaluating the overall impacts that ASC 842 will have on the classification of leases and resulting pattern of expense recognition in the income statement, existing internal controls and processes to comply with the guidance. Accordingly, the Company is still evaluating the effect of the adoption of ASC 842 on its consolidated financial statements.

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Basis Of Presentation (Tables)

6 Months Ended

Jun. 30, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash at June 30, 2018 and December 31, 2017 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statements of Cash Flows.

	June 30, 2018		December 31, 2017
Cash and cash equivalents	$	13,538	$	15,852
Restricted cash included in other long-term assets		1,500		1,500
Cash, cash equivalents and restricted cash at end of period	$	15,038	$	17,352

Schedule of Quarterly Impact of Change in Accounting Policy on Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets

The impact of the change in accounting policy on our Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets is as follows:

	Three Months Ended			Six Months Ended
	June 30, 2017			June 30, 2017
Costs of contract revenues	$	5,492		$	6,862
Income tax benefit		2,330			2,849
Loss from continuing operations		(3,162	)		(4,013	)
Net loss	$	(3,162	)	$	(4,013	)
Comprehensive loss	$	(3,162	)	$	(4,013	)
Basic loss per share attributable to continuing operations	$	(0.05	)	$	(0.06	)
Diluted loss per share attributable to continuing operations	$	(0.05	)	$	(0.06	)

	June 30, 2017
Prepaid expenses and other current assets	$	(6,862	)
Deferred income taxes		(2,849	)
Accumulated deficit	$	(4,013	)

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Computations For Basic And Diluted Earnings (Loss) Per Share

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

	Three Months Ended						Six Months Ended
(shares in thousands)	June 30,						June 30,
	2018			2017			2018			2017
Loss from continuing operations	$	(974	)	$	(4,224	)	$	(10,295	)	$	(8,798	)
Income (loss) from discontinued operations, net of income taxes		—			368			—			(12,697	)
Net loss		(974	)		(3,856	)		(10,295	)		(21,495	)
Weighted-average common shares outstanding — basic		62,267			61,342			62,041			61,204
Effect of stock options and restricted stock units		—			—			—			—
Weighted-average common shares outstanding — diluted		62,267			61,342			62,041			61,204
Loss per share from continuing operations — basic	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)
Loss per share from continuing operations — diluted	$	(0.02	)	$	(0.07	)	$	(0.17	)	$	(0.14	)

Schedule of Stock Options and Restricted Stock Units Excluded from Diluted Weighted-Average Common Shares

For the quarter and year ended June 30, 2018 and 2017, the following stock options and restricted stock units were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during these periods:

	Three Months Ended				Six Months Ended
(shares in thousands)	June 30,				June 30,
	2018		2017		2018		2017
Effect of stock options and restricted stock units		429		603		920		654

Schedule of Stock Options and Restricted Stock Units Excluded from Calculation of Anti-Diluted Earnings Per Share

For the quarter and year ended June 30, 2018 and 2017, the following stock options and restricted stock units were excluded from the calculation of diluted earnings per share as such stock options and restricted stock units were determined to be anti-dilutive:

	Three Months Ended				Six Months Ended
(shares in thousands)	June 30,				June 30,
	2018		2017		2018		2017
Effect of stock options and restricted stock units		1,495		1,331		1,524		1,455

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Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2018

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses at June 30, 2018 and December 31, 2017 are as follows:

	June 30,		December 31,
	2018		2017
Insurance	$	14,357	$	22,941
Payroll and employee benefits		8,078		8,747
Accrued rent		5,417		6,519
Interest		3,853		4,210
Percentage of completion adjustment		3,302		3,591
Income and other taxes		2,341		2,794
Other		8,595		7,416
Total accrued expenses	$	45,943	$	56,218

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	1,335	$	—		1,335	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 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	$	2,501	$	—	$	2,501	$	—

Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location

The fair value of the fuel hedge contracts outstanding as of June 30, 2018 and December 31, 2017 is as follows:

		Fair Value at
		June 30,		December 31,
	Balance Sheet Location	2018		2017
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	1,335	$	2,501

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,
	2018			2017			2018			2017
Cumulative translation adjustments—net of tax	$	(57	)	$	6		$	1,304		$	(22	)
Derivatives:
Reclassification of derivative (gains) losses to earnings—net of tax		(1,037	)		155			(1,769	)		195
Change in fair value of derivatives—net of tax		910			(873	)		908			(1,647	)
Net unrealized gain on derivatives—net of tax		(127	)		(718	)		(861	)		(1,452	)
Total other comprehensive income (loss)	$	(184	)	$	(712	)	$	443		$	(1,474	)

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	2018			2017		2018			2017
Derivatives:
Fuelhedge contracts	Costs of contract revenues	$	(1,404	)	$	257	$	(2,396	)	$	323
	Income tax (provision) benefit		(367	)		102		(627	)		128
		$	(1,037	)	$	155	$	(1,769	)	$	195

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Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Revenue Recognition [Line Items]

Summary of Segment and Type of Work and Customer, Contract Revenues

The following table sets forth, by segment and type of work, the Company’s contract revenues for the periods ended:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Revenues (in thousands)	2018		2017			2018		2017
Dredging:
Capital—U.S.	$	69,651	$	31,472		$	146,603	$	98,073
Capital—foreign		3,279		12,420			8,802		31,574
Coastal protection		38,121		60,304			79,982		100,639
Maintenance		19,077		34,337			26,880		56,250
Rivers & lakes		5,142		13,974			6,626		19,025
Total dredging revenues		135,270		152,507			268,893		305,561
Environmental & infrastructure		15,320		24,711			28,290		43,935
Intersegment revenue		—		(359	)		—		(2,051	)
Total revenues	$	150,590	$	176,859		$	297,183	$	347,445

The following table sets forth, by segment and type of customer, the Company’s contract revenues for the periods ended:

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Revenues (in thousands)	2018		2017			2018		2017
Dredging:
Federal government	$	92,913	$	83,632		$	169,607	$	195,126
State and local government		23,346		45,027			69,971		60,672
Private		15,732		11,428			20,513		18,189
Foreign		3,279		12,420			8,802		31,574
Total dredging revenues		135,270		152,507			268,893		305,561
Environmental & infrastructure:
Private		11,037		10,961			17,401		21,496
Other		4,283		13,750			10,889		22,439
Intersegment revenue		—		(359	)		—		(2,051	)
Total revenues	$	150,590	$	176,859		$	297,183	$	347,445

Schedule of Accounts Receivable

Accounts receivable at June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
	2018			2017
Completed contracts	$	13,859		$	15,974
Contracts in progress		50,302			42,759
Retainage		18,575			21,866
		82,736			80,599
Allowance for doubtful accounts		(430	)		(591	)
Total accounts receivable—net	$	82,306		$	80,008
Current portion of accounts receivable—net	$	82,306		$	75,533
Long-term accounts receivable and retainage		—			4,475
Total accounts receivable—net	$	82,306		$	80,008

Components of Contracts in Progress

The components of contracts in progress at June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
	2018			2017
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	482,780		$	558,557
Amounts billed		(447,617	)		(490,732	)
Costs and earnings in excess of billings for contracts in progress		35,163			67,825
Costs and earnings in excess of billings for completed contracts		19,840			22,963
Total contract revenues in excess of billings	$	55,003		$	90,788
Billings in excess of costs and earnings:
Amounts billed	$	(219,428	)	$	(325,350	)
Costs and earnings for contracts in progress		210,378			321,735
Total billings in excess of contract revenues	$	(9,050	)	$	(3,615	)

ASU 2014-09 [Member]

Revenue Recognition [Line Items]

Summary of Impact of Change in Accounting Principle on Condensed Consolidated Balance Sheets

At June 30, 2018, the impact of this change in accounting principle on the Condensed Consolidated Balance Sheets is as follows:

	June 30, 2018
ASSETS
Contract revenues in excess of billings	$	(19,353	)
Other current assets		10,310
Other		5,012
LIABILITIES AND EQUITY
Accrued expenses		(547	)
Billings in excess of contract revenues		2,259
Deferred taxes		(1,493	)
Accumulated deficit	$	(4,250	)

Summary of Impact of Change in Accounting Principle on Condensed Consolidated Statements of Operations

For the three and six months ended June 30, 2018, the impact of this change in accounting principle on the Condensed Consolidated Statements of Operations is as follows:

	Three Months Ended			Six Months Ended
	June 30,			June 30,
	2018			2018
Contract revenues	$	(12,951	)	$	(21,612	)
Cost of contract revenues		(9,174	)		(15,869	)
Income tax benefit		982			1,493
Loss from continuing operations		(2,795	)		(4,250	)
Net loss	$	(2,795	)	$	(4,250	)
Comprehensive loss	$	(2,795	)	$	(4,250	)

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Restructuring charges (Tables)

6 Months Ended

Jun. 30, 2018

Restructuring And Related Activities [Abstract]

Schedule of Restructuring Charges

Restructuring charges currently recognized for the above actions are summarized as follows:

	Three Months Ended			Six Months Ended
	June 30, 2018			June 30, 2018
Costs of contract revenues - depreciation	$	1,676		$	4,668
Costs of contract revenues - other		(274	)		993
General and administrative expenses		(28	)		(21	)
Gain on sale of assets—net		(840	)		(847	)
Other expense		—			2,015
Total Dredging		534			6,808
General and administrative expenses		(9	)		159
Total Environmental & Infrastructure		(9	)		159
Costs of contract revenues - depreciation		1,676			4,668
Costs of contract revenues - other		(274	)		993
General and administrative expenses		(37	)		138
Gain on sale of assets—net		(840	)		(847	)
Other expense		—			2,015
Total Consolidated	$	525		$	6,967

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Business Combinations And Dispositions (Tables)

6 Months Ended

Jun. 30, 2018

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 three and 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	)

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Reporting By Segment

Segment information for the periods presented is provided as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Dredging
Contract revenues	$	135,270		$	152,507		$	268,893		$	305,561
Operating income		11,567			2,989			13,745			3,725
Environmental & infrastructure
Contract revenues	$	15,320		$	24,711		$	28,290		$	43,935
Operating loss		(3,433	)		(143	)		(6,651	)		(2,873	)
Intersegment revenues	$	—		$	(359	)	$	—		$	(2,051	)
Total
Contract revenues	$	150,590		$	176,859		$	297,183		$	347,445
Operating income		8,134			2,846			7,094			852

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Basis of Presentation - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Organization Consolidation and Presentation [Line Items]
Cash and cash equivalents	$ 13,538	$ 15,852
Cash, cash equivalents and restricted cash at end of period	15,038	17,352	$ 16,015	$ 19,702
Accounting Standards Update 2016-18 [Member]
Organization Consolidation and Presentation [Line Items]
Cash and cash equivalents	13,538	15,852
Restricted cash included in other long-term assets	1,500	1,500
Cash, cash equivalents and restricted cash at end of period	$ 15,038	$ 17,352

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Basis of Presentation - Schedule of Quarterly Impact of Change in Accounting Policy on Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Organization Consolidation and Presentation [Line Items]
Costs of contract revenues	$ 128,350	$ 156,577	$ 260,238	$ 312,351
Income tax benefit	54	(3,454)	(3,241)	(6,247)
Loss from continuing operations	(974)	(4,224)	(10,295)	(8,798)
Net loss	(974)	(3,856)	(10,295)	(21,495)
Comprehensive loss	$ (1,158)	$ (4,568)	$ (9,852)	$ (22,969)
Basic loss per share attributable to continuing operations	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.14)
Diluted loss per share attributable to continuing operations	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.14)
Prepaid expenses and other current assets	$ 40,947		$ 40,947		$ 45,411
Deferred income taxes	21,896		21,896		25,561
Accumulated deficit	$ (78,973)		$ (78,973)		$ (67,101)
Accounting Standards Update 2016-18 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Organization Consolidation and Presentation [Line Items]
Costs of contract revenues		$ 5,492		$ 6,862
Income tax benefit		2,330		2,849
Loss from continuing operations		(3,162)		(4,013)
Net loss		(3,162)		(4,013)
Comprehensive loss		$ (3,162)		$ (4,013)
Basic loss per share attributable to continuing operations		$ (0.05)		$ (0.06)
Diluted loss per share attributable to continuing operations		$ (0.05)		$ (0.06)
Prepaid expenses and other current assets		$ (6,862)		$ (6,862)
Deferred income taxes		(2,849)		(2,849)
Accumulated deficit		$ (4,013)		$ (4,013)

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Basis Of Presentation (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) segment
Organization Consolidation and Presentation [Line Items]
Number of operating Segments	2
Number of reportable segments	2
Number of reportable segments with goodwill	2
Accounting Standards Update 2014-09 [Member] | Maximum [Member]
Organization Consolidation and Presentation [Line Items]
Cumulative net adjustment to the beginning retained earnings balance | $	$ 1,950

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Earnings Per Share - (Computations For Basic And Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Loss from continuing operations	$ (974)	$ (4,224)	$ (10,295)	$ (8,798)
Income (loss) from discontinued operations, net of income taxes		368		(12,697)
Net loss	$ (974)	$ (3,856)	$ (10,295)	$ (21,495)
Weighted-average common shares outstanding — basic	62,267	61,342	62,041	61,204
Weighted-average common shares outstanding — diluted	62,267	61,342	62,041	61,204
Loss per share from continuing operations — basic	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.14)
Loss per share from continuing operations — diluted	$ (0.02)	$ (0.07)	$ (0.17)	$ (0.14)

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Earnings Per Share - (Schedule of Stock Options and Restricted Stock Units Excluded from Diluted Weighted-Average Common Shares) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Effect of stock options and restricted stock units	429	603	920	654

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Earnings Per Share - (Schedule of Stock Options and Restricted Stock Units Excluded from Calculation of Anti-Diluted Earnings Per Share) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Effect of stock options and restricted stock units	1,495	1,331	1,524	1,455

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Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Insurance	$ 14,357	$ 22,941
Payroll and employee benefits	8,078	8,747
Accrued rent	5,417	6,519
Interest	3,853	4,210
Percentage of completion adjustment	3,302	3,591
Income and other taxes	2,341	2,794
Other	8,595	7,416
Total accrued expenses	$ 45,943	$ 56,218

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Long-Term Debt (Narrative) (Details) - USD ($)		1 Months Ended		6 Months Ended		24 Months Ended
	Dec. 30, 2016	Feb. 28, 2018	May 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Maximum availability of earnings under credit agreement for five consecutive days				$ 31,250,000
Maximum availability of earnings under credit agreement for one day				25,000,000
Revolving credit facility				70,882,000
Letters of credit outstanding				31,587,000
Letter of credit remaining borrowing capacity				75,520,000
Availability under credit agreement suppressed				72,011,000
Net proceeds from issuance					$ 326,241,000
Long-term debt, current maturities				1,169,000			$ 2,758,000
Long-term debt, excluding current Maturities				321,503,000			$ 333,141,000
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				1,169,000
Long-term debt, excluding current Maturities				$ 376,000
Net proceeds from sale-leaseback of a vessel yielding		$ 4,500,000
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%
Maturity date			May 15, 2022
Owned Domestic Subsidiaries Percent			100.00%
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. 28, 2019
Redemption of notes			$ 282,638,000
Maximum [Member]
Debt Instrument [Line Items]
Expenses related to buy-out operating leases				$ 20,000,000
Fixed charge coverage ratio	1.10%
Maximum [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Capital expenditures by credit parties						$ 135,000,000
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 [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

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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, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,335	$ 2,501
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)	$ 1,335	$ 2,501

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Fair Value Measurements (Narrative) (Details) gal in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / gal	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / gal gal	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Derivatives Fair Value [Line Items]
Derivative underlying hedge percent				80.00%
Derivative, Nonmonetary Notional Amount, Volume | gal				5.2
Fair value hedge assets		$ 1,335,000		$ 1,335,000		$ 2,501,000
Reclassification of derivative losses to earnings-net of tax		1,037,000	$ (155,000)	1,769,000	$ (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%
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		332,313,000		$ 332,313,000
Other Expense [Member]
Derivatives Fair Value [Line Items]
Reversal of cumulative translation adjustment		$ 2,015,000
Minimum [Member]
Derivatives Fair Value [Line Items]
Fixed price range | $ / gal		1.74		1.74
Maximum [Member]
Derivatives Fair Value [Line Items]
Fixed price range | $ / gal		2.23		2.23

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Fair Value Measurements (Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Asset derivatives	$ 1,335	$ 2,501
Prepaid Expenses and Other Current Assets [Member] | Derivatives Designated as Hedging Instruments [Member] | Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Asset derivatives	$ 1,335	$ 2,501

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Fair Value Measurements (Changes In Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Cumulative translation adjustments—net of tax	[1]	$ (57)	$ 6	$ 1,304	$ (22)
Reclassification of derivative (gains) losses to earnings—net of tax		(1,037)	155	(1,769)	195
Change in fair value of derivatives—net of tax		910	(873)	908	(1,647)
Net unrealized gain on derivatives—net of tax	[2]	(127)	(718)	(861)	(1,452)
Other comprehensive income (loss)—net of tax		$ (184)	$ (712)	$ 443	$ (1,474)

[1] Net of income tax (provision) benefit of $5 and $(6) for the three months ended June 30, 2018 and 2017, respectively. Net of income tax (provision) benefit of $(530) and $33 for the six months ended June 30, 2018 and 2017, respectively.

[2] Net of income tax provision of $689 and $468 for the three months ended June 30, 2018 and 2017, respectively. Net of income tax provision of $949 and $947 for the six months ended June 30, 2018 and 2017, respectively.

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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	$ 128,350	$ 156,577	$ 260,238	$ 312,351
Income tax (provision) benefit	(54)	3,454	3,241	6,247
Net income (loss)	974	3,856	10,295	21,495
Fuel Hedge Contracts [Member] | Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	(1,404)	257	(2,396)	323
Income tax (provision) benefit	(367)	102	(627)	128
Net income (loss)	$ (1,037)	$ 155	$ (1,769)	$ 195

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Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	May 11, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units				1,976
Share-based compensation expense		$ 1,255	$ 840	$ 2,264	$ 1,758
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

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Revenue - (Summary of Impact of Change in Accounting Principle on Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Contract revenues in excess of billings	$ 55,003	$ 90,788
Other	12,473	13,128
LIABILITIES AND EQUITY
Accrued expenses	(45,943)	(56,218)
Billings in excess of contract revenues	(9,050)	(3,615)
Deferred taxes	(21,896)	(25,561)
Accumulated deficit	(78,973)	$ (67,101)
ASU 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
ASSETS
Contract revenues in excess of billings	(19,353)
Other current assets	10,310
Other	5,012
LIABILITIES AND EQUITY
Accrued expenses	(547)
Billings in excess of contract revenues	2,259
Deferred taxes	(1,493)
Accumulated deficit	$ (4,250)

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Revenue (Summary of Impact of Change in Accounting Principle on Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract revenues	$ 150,590	$ 176,859	$ 297,183	$ 347,445
Type of Revenue [Extensible List]	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember
Costs of contract revenues	$ 128,350	$ 156,577	$ 260,238	$ 312,351
Type of Cost, Good or Service [Extensible List]	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember	gldd:ContractMember
Income tax benefit	$ 54	$ (3,454)	$ (3,241)	$ (6,247)
Loss from continuing operations	(974)	(4,224)	(10,295)	(8,798)
Net loss	(974)	(3,856)	(10,295)	(21,495)
Comprehensive loss	(1,158)	$ (4,568)	(9,852)	$ (22,969)
ASU 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract revenues	$ (12,951)		$ (21,612)
Type of Revenue [Extensible List]	gldd:ContractMember		gldd:ContractMember
Costs of contract revenues	$ (9,174)		$ (15,869)
Type of Cost, Good or Service [Extensible List]	gldd:ContractMember		gldd:ContractMember
Income tax benefit	$ 982		$ 1,493
Loss from continuing operations	(2,795)		(4,250)
Net loss	(2,795)		(4,250)
Comprehensive loss	$ (2,795)		$ (4,250)

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Revenue (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018
Revenue Recognition [Line Items]
Revenue, remaining performance obligation	$ 534,965		$ 534,965
Percentage of performance obligation to be recognized as revenue			52.00%
Performance obligation, expected to be recognized as revenue year			2018
Remaining performance obligation, expected to be completed	2020		2020
Revenue, description of timing			one year or less
Revenues	$ 150,590	$ 176,859	$ 297,183	$ 347,445
Costs in excess of billings	17,693		17,693
Amortization on pre-construction costs	4,299		4,299		$ 6,796
Other Current and Noncurrent Assets [Member]
Revenue Recognition [Line Items]
Costs to fulfill contracts with customers recognized as an asset	16,300		16,300		$ 7,732
Dredging [Member] | Foreign [Member]
Revenue Recognition [Line Items]
Revenues	$ 3,279	$ 12,420	$ 8,802	$ 31,574

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Revenue (Summary of Segment and Type of Work, Contract Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenues	$ 150,590	$ 176,859	$ 297,183	$ 347,445
Operating Segment [Member] | Environmental And Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenues	15,320	24,711	28,290	43,935
Intersegment Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues		(359)		(2,051)
Type of Work [Member]
Disaggregation Of Revenue [Line Items]
Revenues	150,590	176,859	297,183	347,445
Type of Work [Member] | Operating Segment [Member] | Dredging [Member]
Disaggregation Of Revenue [Line Items]
Revenues	135,270	152,507	268,893	305,561
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Capital-U.S. [Member]
Disaggregation Of Revenue [Line Items]
Revenues	69,651	31,472	146,603	98,073
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Capital-Foreign [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,279	12,420	8,802	31,574
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Coastal Protection [Member]
Disaggregation Of Revenue [Line Items]
Revenues	38,121	60,304	79,982	100,639
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Maintenance [Member]
Disaggregation Of Revenue [Line Items]
Revenues	19,077	34,337	26,880	56,250
Type of Work [Member] | Operating Segment [Member] | Dredging [Member] | Rivers & Lakes [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5,142	13,974	6,626	19,025
Type of Work [Member] | Operating Segment [Member] | Environmental And Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 15,320	24,711	$ 28,290	43,935
Type of Work [Member] | Intersegment Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues		$ (359)		$ (2,051)

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Revenue (Summary of Segment and Type of Customer, Contract Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenues	$ 150,590	$ 176,859	$ 297,183	$ 347,445
Dredging [Member] | Foreign [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,279	12,420	8,802	31,574
Operating Segment [Member] | Environmental And Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenues	15,320	24,711	28,290	43,935
Intersegment Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues		(359)		(2,051)
Type of Customer [Member]
Disaggregation Of Revenue [Line Items]
Revenues	150,590	176,859	297,183	347,445
Type of Customer [Member] | Federal Government [Member]
Disaggregation Of Revenue [Line Items]
Revenues	92,913	83,632	169,607	195,126
Type of Customer [Member] | State and Local Government [Member]
Disaggregation Of Revenue [Line Items]
Revenues	23,346	45,027	69,971	60,672
Type of Customer [Member] | Private [Member]
Disaggregation Of Revenue [Line Items]
Revenues	15,732	11,428	20,513	18,189
Type of Customer [Member] | Foreign [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,279	12,420	8,802	31,574
Type of Customer [Member] | Operating Segment [Member] | Dredging [Member]
Disaggregation Of Revenue [Line Items]
Revenues	135,270	152,507	268,893	305,561
Type of Customer [Member] | Operating Segment [Member] | Environmental And Infrastructure [Member] | Private [Member]
Disaggregation Of Revenue [Line Items]
Revenues	11,037	10,961	17,401	21,496
Type of Customer [Member] | Operating Segment [Member] | Environmental And Infrastructure [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 4,283	13,750	$ 10,889	22,439
Type of Customer [Member] | Intersegment Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues		$ (359)		$ (2,051)

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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Completed contracts	$ 13,859	$ 15,974
Contracts in progress	50,302	42,759
Retainage	18,575	21,866
Accounts receivable, gross	82,736	80,599
Allowance for doubtful accounts	(430)	(591)
Total accounts receivable—net	82,306	80,008
Accounts receivable—net	$ 82,306	75,533
Long-term accounts receivable and retainage		$ 4,475

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Revenue (Components of Contracts in Progress) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 35,163	$ 67,825
Costs and earnings in excess of billings for completed contracts	19,840	22,963
Total contract revenues in excess of billings	55,003	90,788
Total billings in excess of contract revenues	(9,050)	(3,615)
Costs And Earnings In Excess Of Billings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	482,780	558,557
Amounts billed	(447,617)	(490,732)
Billings In Excess Of Costs And Earnings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	(210,378)	(321,735)
Amounts billed	$ (219,428)	$ (325,350)

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Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Accrued rent expense	$ 4,959	$ 5,930
Severance expense	$ 849	1,567
Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		42,000
Restructuring charge related to non-cash		38,000
Minimum [Member] | Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		12,500
Minimum [Member] | Loss on Sale of Assets [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		3,000
Minimum [Member] | Other Items [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		21,500
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		47,000
Restructuring charge related to non-cash		43,000
Maximum [Member] | Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		14,500
Maximum [Member] | Loss on Sale of Assets [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		5,000
Maximum [Member] | Other Items [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		23,500
Severance [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		3,000
Asset Retirements [Member] | Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		30,000
Asset Retirements [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		34,000
Pre-contract Costs [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		6,500
Closeout Costs [Member] | Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		2,500
Closeout Costs [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charges		$ 3,500

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Restructuring Charges (Schedule of Restructuring Charges) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 525	$ 6,967
Costs of Contract Revenues - Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1,676	4,668
Costs of Contract Revenues - Other [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(274)	993
General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(37)	138
Gain on Sale of Assets—Net [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(840)	(847)
Other Expense [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges		2,015
Dredging [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	534	6,808
Dredging [Member] | Costs of Contract Revenues - Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1,676	4,668
Dredging [Member] | Costs of Contract Revenues - Other [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(274)	993
Dredging [Member] | General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(28)	(21)
Dredging [Member] | Gain on Sale of Assets—Net [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(840)	(847)
Dredging [Member] | Other Expense [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges		2,015
Environmental And Infrastructure [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(9)	159
Environmental And Infrastructure [Member] | General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ (9)	$ 159

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Commitments And Contingencies (Narrative) (Details) - USD ($)			6 Months Ended
	Feb. 28, 2017	Jan. 14, 2015	Jun. 30, 2018	May 31, 2017
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 1,245,099,000
Revenue value remaining from outstanding performance bonds			498,059,000
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 facility, maximum borrowing capacity				$ 20,881,000
Environmental And Infrastructure Segment [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds			41,085,000
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

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Investments (Details) - TerraSea Environmental Solutions [Member] - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2018
Schedule Of Equity Method Investments [Line Items]
Ownership percentage		50.00%
Loss from joint venture	$ 1,458

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Business Combinations And Dispositions (Narrative) (Details) - USD ($) $ in Thousands				3 Months Ended	6 Months Ended
	Feb. 28, 2017	Nov. 04, 2014	Apr. 23, 2014	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2015
Business Acquisition [Line Items]
Estimated surety bond claim, including associated expenses				$ 20,900	$ 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
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

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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)

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Segment Information (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018 segment
Segment Reporting [Abstract]
Number of reportable segments	2

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Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Contract revenues	$ 150,590	$ 176,859	$ 297,183	$ 347,445
Operating income (loss)	8,134	2,846	7,094	852
Dredging Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	11,567	2,989	13,745	3,725
Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(3,433)	(143)	(6,651)	(2,873)
Operating Segment [Member] | Dredging Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	135,270	152,507	268,893	305,561
Operating Segment [Member] | Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 15,320	24,711	$ 28,290	43,935
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues		$ (359)		$ (2,051)