Great Lakes Dredge & Dock (GLDD) 10-Q 3 May 17 2017 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 28, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Trading Symbol	GLDD
Entity Registrant Name	Great Lakes Dredge & Dock CORP
Entity Central Index Key	1,372,020
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		61,272,199

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 6,895	$ 11,167
Accounts receivable—net	91,385	88,091
Contract revenues in excess of billings	75,696	95,012
Inventories	38,307	37,137
Prepaid expenses and other current assets	79,838	75,819
Total current assets	292,121	307,226
PROPERTY AND EQUIPMENT—Net	419,268	413,008
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,927	85,075
INVENTORIES—Noncurrent	51,995	52,602
INVESTMENTS IN JOINT VENTURES	5,756	4,734
ASSETS HELD FOR SALE—Noncurrent	9,118	9,299
OTHER	14,442	21,644
TOTAL	877,627	893,588
CURRENT LIABILITIES:
Accounts payable	87,640	103,185
Accrued expenses	80,781	69,043
Billings in excess of contract revenues	8,893	5,141
Current portion of long term debt	2,439	2,465
Total current liabilities	179,753	179,834
7 3/8% SENIOR NOTES	273,248	272,998
REVOLVING CREDIT FACILITY	115,500	104,111
NOTES PAYABLE	12,995	13,293
DEFERRED INCOME TAXES	57,831	68,449
OTHER	6,772	7,013
Total liabilities	646,099	645,698
COMMITMENTS AND CONTINGENCIES (Note 8)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 61,550 and 61,240 shares issued; 61,272 and 60,962 shares outstanding at March 31, 2017 and December 31, 2016, respectively.	6	6
Treasury stock, at cost	(1,433)	(1,433)
Additional paid-in capital	287,491	286,303
Accumulated deficit	(52,629)	(35,841)
Accumulated other comprehensive loss	(1,907)	(1,145)
Total equity	231,528	247,890
TOTAL	$ 877,627	$ 893,588

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	61,550,000	61,240,000
Common stock, shares outstanding	61,272,000	60,962,000

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Contract revenues	$ 170,586	$ 163,119
Costs of contract revenues	154,404	143,129
Gross profit	16,182	19,990
General and administrative expenses	16,795	20,089
(Gain) loss on sale of assets—net	11	(10)
Operating loss	(624)	(89)
Interest expense—net	(5,582)	(5,721)
Equity in earnings (loss) of joint ventures	1	(115)
Other income (expense)	208	(763)
Loss from continuing operations before income taxes	(5,997)	(6,688)
Income tax benefit	2,274	2,653
Loss from continuing operations	(3,723)	(4,035)
Loss from discontinued operations, net of income taxes	(13,065)
Net loss	$ (16,788)	$ (4,035)
Basic loss per share attributable to continuing operations	$ (0.06)	$ (0.07)
Basic loss per share attributable to discontinued operations, net of tax	(0.21)
Basic loss per share	$ (0.27)	$ (0.07)
Basic weighted average shares	61,065	60,507
Diluted loss per share attributable to continuing operations	$ (0.06)	$ (0.07)
Diluted loss per share attributable to discontinued operations, net of tax	(0.21)
Diluted loss per share	$ (0.27)	$ (0.07)
Diluted weighted average shares	61,065	60,507

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (16,788)	$ (4,035)
Currency translation adjustment—net of tax	[1]	(28)	409
Net unrealized gain on derivatives—net of tax	[2]	(734)
Other comprehensive income (loss)—net of tax		(762)	409
Comprehensive loss		$ (17,550)	$ (3,626)
[1]	Net of income tax (provision) benefit of $39 and $(271) for the three months ended March 31, 2017 and 2016, respectively.
[2]	Net of income tax provision of $479 for the three months ended March 31, 2017.

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ 39	$ (271)
Net unrealized (gain) loss on derivatives, tax	$ 479

Condensed Consolidated Stateme7

Condensed Consolidated Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
BALANCE - value at Dec. 31, 2015	$ 252,173	$ 6	$ (1,433)	$ 283,247	$ (27,664)	$ (1,983)
BALANCE - shares at Dec. 31, 2015		60,709	(278)
Share-based compensation, value	927			927
Share-based compensation, shares		81
Exercise of options and purchases from employee stock plans, value	415			415
Exercise of options and purchases from employee stock plans, shares		144
Net loss	(4,035)				(4,035)
Other comprehensive Income (loss)—net of tax	409					409
BALANCE - value at Mar. 31, 2016	249,889	$ 6	$ (1,433)	284,589	(31,699)	(1,574)
BALANCE - shares at Mar. 31, 2016		60,934	(278)
BALANCE - value at Dec. 31, 2016	247,890	$ 6	$ (1,433)	286,303	(35,841)	(1,145)
BALANCE - shares at Dec. 31, 2016		61,240	(278)
Share-based compensation, value	918			918
Share-based compensation, shares		109
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(164)			(164)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		69
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	(16,788)				(16,788)
Other comprehensive Income (loss)—net of tax	(762)					(762)
BALANCE - value at Mar. 31, 2017	$ 231,528	$ 6	$ (1,433)	$ 287,491	$ (52,629)	$ (1,907)
BALANCE - shares at Mar. 31, 2017		61,550	(278)

Condensed Consolidated Stateme8

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES:
Net loss	$ (16,788)	$ (4,035)
Loss from discontinued operations, net of income taxes	(13,065)
Loss from continuing operations	(3,723)	(4,035)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	14,571	13,928
Equity in earnings of joint ventures	(3,067)	(419)
Cash distributions from joint ventures	2,046
Deferred income taxes	(2,306)	(2,108)
(Gain) loss on sale of assets—net	11	(10)
Amortization of deferred financing fees	825	623
Unrealized net (gain) loss from mark-to-market valuations of derivatives	1,548	(1,332)
Unrealized foreign currency gain	(76)	(77)
Share-based compensation expense	918	927
Changes in assets and liabilities:
Accounts receivable	(3,234)	29,748
Contract revenues in excess of billings	19,362	6,748
Inventories	(609)	(2,603)
Prepaid expenses and other current assets	(7,392)	(3,418)
Accounts payable and accrued expenses	(27,610)	(33,322)
Billings in excess of contract revenues	3,931	(910)
Other noncurrent assets and liabilities	(255)	(780)
Cash provided by (used in) operating activities	(5,060)	2,960
INVESTING ACTIVITIES:
Purchases of property and equipment	(17,452)	(14,917)
Proceeds from dispositions of property and equipment	265	25
Changes in restricted cash	7,035
Net cash flows used in investing activities	(10,152)	(14,892)
FINANCING ACTIVITIES:
Deferred financing fees	(58)
Repayments of long term note payable	(283)	(265)
Taxes paid on settlement of vested share awards	(164)
Repayments of term loan facility		(1,250)
Repayments of equipment debt	(376)	(367)
Exercise of options and purchases from employee stock plans	434	415
Borrowings under revolving loans	28,112	38,000
Repayments of revolving loans	(16,723)	(23,000)
Cash provided by financing activities	10,942	13,533
Effect of foreign currency exchange rates on cash and cash equivalents	(2)	109
Net increase (decrease) in cash and cash equivalents	(4,272)	1,710
Cash and cash equivalents at beginning of period	11,167	14,184
Cash and cash equivalents at end of period	6,895	15,894
Supplemental Cash Flow Information
Cash paid for interest	11,473	11,276
Cash paid (refunded) for income taxes	89	(1)
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 2,187	$ 10,003

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 2017
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, 2016. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of March 31, 2017, and its results of operations for the three months ended March 31, 2017 and 2016 and cash flows for the three months ended March 31, 2017 and 2016 have been included. The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel, supplies, short-term rentals and project overhead. Hourly labor is generally hired on a project-by-project basis. Costs of contract revenues vary significantly depending on the type and location of work performed and assets utilized. The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. These costs have averaged approximately 23% of total costs of contract revenues over the prior three years. During the year, both equipment utilization and the timing of fixed cost expenditures fluctuate significantly. Accordingly, the Company allocates these fixed equipment costs to interim periods in proportion to revenues recognized over the year, to better match revenues and expenses. Specifically, at each interim reporting date the Company compares actual revenues earned to date on its dredging contracts to expected annual revenues and recognizes equipment costs on the same proportionate basis. In the fourth quarter, any over or under allocated equipment costs are recognized such that the expense for the year equals actual equipment costs incurred during the year. The Company has two operating segments: dredging and environmental & infrastructure, which are also the Company’s two reportable segments. The Company has determined that dredging, Terra Contracting Services, LLC (“Terra”) and Great Lakes Environmental & Infrastructure, LLC (“GLEI”) are the Company’s three reporting units. The Company performed its most recent annual test of impairment as of July 1, 2016 with no indication of impairment as of the test date. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2017 should no triggering events occur which would require a test prior to the next annual test. The condensed consolidated results of operations and comprehensive income for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2017-04 (“ASU 2017-04”), Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The Company is currently evaluating the impact of ASU 2017-04 on its consolidated financial statements. In November 2016, the FASB issued Accounting Standard Update No. 2016-18 (“ASU 2016-18”), Statement of Cashflows (Topic 230): Restricted Cash In August 2016, the FASB issued Accounting Standard Update No. 2016-15 (“ASU 2016-15”), Classification of Certain Cash Receipts and Cash Payments, In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) In May 2014, the FASB issued Accounting Standard Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) Accounting Standard Updates related to Accounting Standards Codification Topic 606 (collectively, “ASC 606”),

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	2. Earnings per share Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings per share is computed similarly to basic earnings per share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. For the three months ended March 31, 2017 and 2016, the dilutive effect of 678 thousand and 359 thousand stock options and restricted stock units, respectively, were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during these periods. For the three months ended March 31, 2017 and 2016, 1,580 thousand and 1,812 thousand stock options and restricted stock units, respectively, were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method, as such stock options and restricted stock units were determined to be anti-dilutive. The computations for basic and diluted loss per share are as follows: Three Months Ended (shares in thousands) March 31, 2017 2016 Loss from continuing operations $ (3,723 ) $ (4,035 ) Loss from discontinued operations, net of income taxes (13,065 ) — Net loss (16,788 ) (4,035 ) Weighted-average common shares outstanding — basic 61,065 60,507 Effect of stock options and restricted stock units — — Weighted-average common shares outstanding — diluted 61,065 60,507 Loss per share from continuing operations — basic $ (0.06 ) $ (0.07 ) Loss per share from continuing operations — diluted $ (0.06 ) $ (0.07 )

Accounts Receivable And Contrac

Accounts Receivable And Contracts In Progress	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Accounts receivable and contracts in progress	3. Accounts receivable and contracts in progress Accounts receivable at March 31, 2017 and December 31, 2016 are as follows: March 31, December 31, 2017 2016 Completed contracts $ 21,547 $ 18,727 Contracts in progress 57,039 53,137 Retainage 18,021 21,399 96,607 93,263 Allowance for doubtful accounts (747 ) (747 ) Total accounts receivable—net $ 95,860 $ 92,516 Current portion of accounts receivable—net $ 91,385 $ 88,091 Long-term accounts receivable and retainage 4,475 4,425 Total accounts receivable—net $ 95,860 $ 92,516 The components of contracts in progress at March 31, 2017 and December 31, 2016 are as follows: March 31, December 31, 2017 2016 Costs and earnings in excess of billings: Costs and earnings for contracts in progress $ 553,027 $ 587,371 Amounts billed (499,249 ) (511,548 ) Costs and earnings in excess of billings for contracts in progress 53,778 75,823 Costs and earnings in excess of billings for completed contracts 21,918 19,189 Total contract revenues in excess of billings $ 75,696 $ 95,012 Billings in excess of costs and earnings: Amounts billed $ (341,000 ) $ (268,754 ) Costs and earnings for contracts in progress 332,107 263,613 Total billings in excess of contract revenues $ (8,893 ) $ (5,141 ) The Company has $17,860 included in costs in excess of billings that are dependent upon the sale of environmental credits earned for a wetland mitigation project. The sale of these credits is subject to market factors that could cause the amount of expected revenue to be higher or lower than currently estimated. If the amount of proceeds received from the sale of the environmental credits is lower than our expectations, we could sustain a loss of part or all of the costs incurred related to this project. Additionally, the timing of realization may be impacted by a delay in the sale of these environmental credits, resulting in a longer period to recover our investment.

Accrued Expenses

Accrued Expenses	3 Months Ended
	Mar. 31, 2017
Payables And Accruals [Abstract]
Accrued Expenses	4. Accrued expenses Accrued expenses at March 31, 2017 and December 31, 2016 are as follows: March 31, December 31, 2017 2016 Insurance $ 21,996 $ 18,114 Surety bond claim 20,900 — Accumulated deficit in joint ventures 17,016 17,016 Payroll and employee benefits 5,258 10,028 Interest 3,918 8,660 Income and other taxes 2,117 3,208 Percentage of completion adjustment 1,546 3,322 Fuel hedge contracts 468 — Other 7,562 8,695 Total accrued expenses $ 80,781 $ 69,043

Long-term Debt

Long-term Debt	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Long-Term Debt	5. Long-term debt Credit Agreement On December 30, 2016, the Company, Great Lakes Dredge & Dock Company, LLC, NASDI Holdings, LLC, Great Lakes Dredge & Dock Environmental, Inc., Great Lakes Environmental & Infrastructure Solutions, LLC and Great Lakes Environmental & Infrastructure, LLC (collectively, the “Credit Parties”) entered into a revolving credit and security agreement, as subsequently amended, (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, PNC Bank, National Association, as Agent, PNC Capital Markets, The PrivateBank and Trust Company, Suntrust Robinson Humphrey, Inc., Capital One, National Association and Bank of America, N.A., as Joint Lead Arrangers and Joint Bookrunners, Texas Capital Bank, National Association, as Syndication Agent and Woodforest National Bank, as Documentation Agent. The Credit Agreement, which replaced the Company’s former revolving credit agreement, provides for a senior secured revolving credit facility in an aggregate principal amount of up to $250,000, subfacilities for the issuance of standby letters of credit up to a $250,000 sublimit and swingline loans up to a $25,000 sublimit. The maximum borrowing capacity under the Credit Agreement is determined by a formula and may fluctuate depending on the value of the collateral included in such formula at the time of determination. The Credit Agreement also includes an increase option that will allow the Company to increase the senior secured revolving credit facility by an aggregate principal amount of up to $100,000. This increase is subject to lenders providing incremental commitments for such increase, the Credit Parties having adequate borrowing capacity and provided that no default or event of default exists both before and after giving effect to such incremental commitment increase. The Credit Agreement contains customary representations and affirmative and negative covenants, including a springing financial covenant that requires the Credit Parties to maintain a fixed charge coverage ratio (ratio of earnings before income taxes, depreciation and amortization, net interest expenses, non-cash charges and losses and certain other non-recurring charges, minus capital expenditures, income and franchise taxes, to net cash interest expense plus scheduled cash principal payments with respect to debt plus restricted payments paid in cash) of not more than 1.10 to 1.00. The Credit Parties are also restricted in the amount of capital expenditures they may make in each of the next three fiscal years. The Credit Agreement also contains customary events of default (including non-payment of principal or interest on any material debt and breaches of covenants) as well as events of default relating to certain actions by the Company’s surety bonding providers. The obligations of the Credit Parties under the Credit Agreement will be unconditionally guaranteed, on a joint and several basis, by each existing and subsequently acquired or formed material direct and indirect domestic subsidiary of the Company. Borrowings under the Credit Agreement were or will be used to refinance existing indebtedness under the Company’s former revolving credit agreement, refinance existing indebtedness under the Company’s former term loan agreement, pay fees and expenses related to the Credit Agreement, finance acquisitions permitted under the Credit Agreement, finance ongoing working capital and for other general corporate purposes. The Credit Agreement matures on December 30, 2019; provided that the maturity date would be accelerated to November 3, 2018 if the Company fails to refinance its unsecured senior notes that mature February 1, 2019. The refinanced notes must have a maturity on or after March 31, 2020. 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 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 outstandings under the senior secured revolving credit facility. As of March 31, 2017, the Company had $115,500 of borrowings on the revolver and $62,695 of letters of credit outstanding, resulting in $45,121 of availability under the Credit Agreement. Prior revolving credit agreement and term loan facility In conjunction with the Credit Agreement entered into on December 30, 2016, the senior revolving credit agreement with an aggregate principal amount of up to $199,000 and the senior secured term loan facility consisting of a term loan in an aggregate principal amount of $50,000 were paid in full. Depending on the Company’s consolidated leverage ratio, previous borrowings under the revolving credit facility beared interest at the option of the Company at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum. The previous borrowings under the senior secured term loan facility beared interest at a fixed rate of 4.655% per annum. Senior notes The Company has outstanding $275,000 of 7.375% senior notes due February 2019. There is an optional redemption on all notes. The redemption prices are 103.7% in 2015, 101.8% in 2016 and 100% in any year following, until the notes mature in 2019. Interest is paid semi-annually, and principal is due at maturity. Other The Company enters into note arrangements to finance certain vessels and ancillary equipment. During the first quarter of 2015, the Company financed the $15,569 acquisition of a vessel previously under an operating lease with a note bearing interest at 5.75% to maturity in 2023. The current portion of all equipment notes is $2,439. The long term portion is $14,021 and is included in notes payable or other long term liabilities.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	6. Fair value measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A fair value hierarchy has been established by GAAP that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The accounting guidance describes three levels of inputs that may be used to measure fair value: Level 1—Quoted prices in active markets for identical assets or liabilities. Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. At times, the Company holds certain derivative contracts that it uses to manage foreign currency risk or commodity price risk. The Company does not hold or issue derivatives for speculative or trading purposes. The fair values of these financial instruments are summarized as follows: Fair Value Measurements at Reporting Date Using Description At March 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 $ 468 $ — $ 468 $ — Fair Value Measurements at Reporting Date Using Description At December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fuel hedge contracts $ 2,293 $ — $ 2,293 $ — Fuel hedge contracts The Company is exposed to certain market risks, primarily commodity price risk as it relates to diesel fuel purchase requirements, which occur in the normal course of business. The Company enters into heating oil commodity swap contracts to hedge the risk that fluctuations in diesel fuel prices will have an adverse impact on cash flows associated with its domestic dredging contracts. The Company’s goal is to hedge approximately 80% of the fuel requirements for work in domestic backlog. As of March 31, 2017, the Company was party to various swap arrangements to hedge the price of a portion of its diesel fuel purchase requirements for work in its backlog to be performed through February 2018. As of March 31, 2017, there were 10.6 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through February 2018. Under these swap agreements, the Company will pay fixed prices ranging from $1.49 to $1.76 per gallon. At March 31, 2017 the fair value liability of the fuel hedge contracts was estimated to be $468 and is recorded in accrued expenses. At December 31, 2016, the fair value asset of the fuel hedge contracts was estimated to be $2,293 and is recorded in prepaid expenses and other current assets. For fuel hedge contracts considered to be highly effective, the losses reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the three months ended March 31, 2017 were $40. The remaining gains and losses included in accumulated other comprehensive loss at March 31, 2017 will be reclassified into earnings over the next eleven months, corresponding to the period during which the hedged fuel is expected to be utilized. Changes in the fair value of fuel hedge contracts not considered highly effective are recorded as cost of contract revenues in the Statement of Operations. The fair values of fuel hedges are corroborated using inputs that are readily observable in public markets; therefore, the Company determines fair value of these fuel hedges using Level 2 inputs. The Company is exposed to counterparty credit risk associated with non-performance of its various derivative instruments. The Company’s risk would be limited to any unrealized gains on current positions. To help mitigate this risk, the Company transacts only with counterparties that are rated as investment grade or higher. In addition, all counterparties are monitored on a continuous basis. The fair value of the fuel hedge contracts outstanding as of March 31, 2017 and December 31, 2016 is as follows: Fair Value at March 31, December 31, Balance Sheet Location 2017 2016 Asset derivatives: Derivatives designated as hedging instruments Fuel hedge contracts Prepaid expenses and other current assets $ — $ 546 Derivatives not designated as hedging instruments Fuel hedge contracts Prepaid expenses and other current assets — 1,747 Total asset derivatives $ — $ 2,293 Liability derivatives: Derivatives designated as hedging instruments Fuel hedge contracts Accrued expenses $ 667 $ — Derivatives not designated as hedging instruments Fuel hedge contracts Accrued expenses (199 ) — Total liability derivatives $ 468 $ — Accumulated other comprehensive income (loss) Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows: Three Months Ended March 31, 2017 2016 Cumulative translation adjustments—net of tax $ (28 ) $ 409 Derivatives: Reclassification of derivative losses to earnings—net of tax 40 — Change in fair value of derivatives—net of tax (774 ) — Net unrealized gain on derivatives—net of tax (734 ) — Total other comprehensive income (loss) $ (762 ) $ 409 Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows: Three Months Ended March 31, Statement of Operations Location 2017 Derivatives: Fuel Costs of contract revenues $ 66 Income tax benefit 26 $ 40 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. In January 2011 and again in November 2014, the Company issued a total of $275,000 of 7.375% senior notes due February 1, 2019, which were outstanding at March 31, 2017 (See Note 5). The senior notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the senior notes. The fair value of the senior notes was $272,608 at March 31, 2017, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets. It is impracticable to determine the fair value of outstanding letters of credit or performance, bid and payment bonds due to uncertainties as to the amount and timing of future obligations, if any.

Share-Based Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation	7 . Share-based compensation The Company’s 2007 Long-Term Incentive Plan permits the granting of stock options, stock appreciation rights, restricted stock and restricted stock units to its employees and directors for up to 5.8 million shares of common stock. In March 2017, the Company granted 612 thousand restricted stock units to certain employees pursuant to the plan. In addition, all non-employee directors on the Company’s board of directors are paid a portion of their board-related compensation in stock grants. Compensation cost charged to expense related to share-based compensation arrangements was $918 and $927 for the three months ended March 31, 2017 and 2016, respectively. Beginning in the first quarter of 2017, the Company includes income taxes related to share-based compensation as a component of net income.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments And Contingencies	8. Commitments and contingencies Commercial commitments Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some environmental & infrastructure projects. The Company has bonding agreements with Argonaut Insurance Company, Berkley Insurance Company, Chubb Surety, Liberty Mutual Insurance Company and Zurich American Insurance Company (“Zurich”), under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty and Surety Company of America. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At March 31, 2017, the Company had outstanding performance bonds with a notional amount of approximately $1,188,986, of which $44,934 relates to projects from the Company’s historical environmental & infrastructure businesses. The revenue value remaining in backlog related to these projects totaled approximately $429,600. 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. We expect that Zurich will draw upon the letter of credit. As the outstanding letters of credit previously reduced our availability under the revolving credit facility, this draw down on our letter of credit will not impact our liquidity or capital availability. Pursuant to the terms of sale of our historical demolition business, the Company received an indemnification from the buyer for losses resulting from the bonding arrangement. The Company intends to aggressively pursue enforcement of the indemnification provisions if the buyer of the historical demolition business is found to be in default of its obligations. The Company cannot estimate the amount or range of recoveries related to the indemnification or resolution of the Company’s responsibilities under the surety bond. The surety bond claim impact has been included in discontinued operations and is discussed in Note 10. Certain foreign projects performed by the Company have warranty periods, typically spanning no more than one to three years beyond project completion, whereby the Company retains responsibility to maintain the project site to certain specifications during the warranty period. Generally, any potential liability of the Company is mitigated by insurance, shared responsibilities with consortium partners, and/or recourse to owner-provided specifications. Legal proceedings and other contingencies As is customary with negotiated contracts and modifications or claims to competitively bid contracts with the federal government, the government has the right to audit the books and records of the Company to ensure compliance with such contracts, modifications, or claims, and the applicable federal laws. The government has the ability to seek a price adjustment based on the results of such audit. Any such audits have not had, and are not expected to have, a material impact on the financial position, operations, or cash flows of the Company. Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against the Company and certain of its subsidiaries. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved, or settled adversely to the Company. Although the Company is subject to various claims and legal actions that arise in the ordinary course of business, except as described below, the Company is not currently a party to any material legal proceedings or environmental claims. The Company records an accrual when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. The Company does not believe any of these proceedings, individually or in the aggregate, would be expected to have a material effect on results of operations, cash flows or financial condition. On April 23, 2014, the Company completed the sale of NASDI, LLC (“NASDI”) and Yankee Environmental Services, LLC (“Yankee”), which together comprised the Company’s historical demolition business, to a privately owned demolition company. A legal action brought by the Company to enforce the buyer’s obligations under the sale agreement is 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 buyer’s obligation to collect and to remit the additional proceeds, and other related relief. Defendants have filed counterclaims alleging that the Company misrepresented the quality of its contracts and receivables prior to the sale. The Company denies defendants’ allegations and intends to vigorously defend against the counterclaims. Except as noted above, the Company has not accrued any amounts with respect to the above matters, as the Company does not believe, based on information currently known to it, that a loss relating to these matters is probable, and an estimate of a range of potential losses relating to these matters cannot reasonably be made.

Investments

Investments	3 Months Ended
	Mar. 31, 2017
Equity Method Investments And Joint Ventures [Abstract]
Investments	9. Investments The Company owns 50% of TerraSea Environmental Solutions (“TerraSea”) as a joint venture. TerraSea is engaged in the environmental services business through its ability to remediate contaminated soil and dredged sediment treatment. At March 31, 2017 and December 31, 2016, the Company had net advances to TerraSea of $24,703 and $24,696, respectively, which are recorded in prepaid expenses and other current assets. The Company has an accumulated deficit in joint ventures, which represents losses recognized to date in excess of our investment in TerraSea, of $17,016 at March 31, 2017 and December 31, 2016, which is presented in accrued expenses. The Company has commenced the wind down of TerraSea with its joint venture partner. The Company believes its remaining net advances to TerraSea are ultimately recoverable as an obligation of our joint venture partner. T

Business Combinations And Dispo

Business Combinations And Dispositions	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Business Combinations And Dispositions	10. Business combinations and dispositions Discontinued operations On April 23, 2014, the Company entered into an agreement and completed the sale of NASDI and Yankee, its two former subsidiaries that comprised our historical demolition business. Under the terms of the agreement, the Company received cash of $5,309 and retained the right to receive additional proceeds based upon future collections of outstanding accounts receivable and work in process existing at the date of close, including recovery of outstanding claims for additional compensation from customers, net of future payments of accounts payable existing at the date of close, including any future payments of obligations associated with outstanding claims. The amount and timing of any realization of additional net proceeds has been impacted by the litigation with the buyer of the historical demolition business. However, management believes that the ultimate resolution of these matters will not be material to the Company’s consolidated financial position or results of operations. As discussed in Note 8, the Company was notified by Zurich of an alleged default triggered on a historical demolition surety performance bond in the aggregate of approximately $20,000 for failure of the contractor to perform in accordance with the terms of a project. Zurich could be obligated to reimburse the loss, damage and expense that may arise from the alleged default. The Company estimated its exposure to a surety bond claim, including associated expenses, to be $20,900 and has recorded this amount during the first quarter of 2017 in discontinued operations as follows: Three Months Ended March 31, 2017 Revenue $ — Loss before income taxes from discontinued operations $ (20,900 ) Income tax benefit 7,835 Loss from discontinued operations, net of income taxes $ (13,065 ) 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 $25,000 paid at closing, the issuance of a promissory note and an earnout payment. Magnus did not reach the minimum EBITDA threshold for 2015 designated in the secured promissory note; therefore, during 2015, the Company reduced the remaining fair value to zero. Under the terms of the acquisition, as amended, the maximum potential aggregate earnout (the “Earnout Payment”) is $11,400 Other During the fourth quarter of 2016, the Company sold assets associated with certain service lines of the environmental & infrastructure segment’s business, excluding assets supporting the remediation service line.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Segment Information	11. Segment information The Company and its subsidiaries currently operate in two reportable segments: dredging and environmental & infrastructure. The Company’s financial reporting systems present various data for management to run the business, including profit and loss statements prepared according to the segments presented. Management uses operating income to evaluate performance between the two segments. Segment information for the periods presented is provided as follows: Three Months Ended March 31, 2017 2016 Dredging Contract revenues $ 153,054 $ 145,013 Operating income 2,106 10,585 Environmental & infrastructure Contract revenues $ 19,224 $ 19,090 Operating loss (2,730 ) (10,674 ) Intersegment revenues $ (1,692 ) $ (984 ) Total Contract revenues $ 170,586 $ 163,119 Operating loss (624 ) (89 ) Foreign dredging revenue of $19,154 for the three months ended March 31, 2017 was mostly attributable to work done in the Middle East. Foreign dredging revenue for the three months ended March 31, 2016 was $1,509. The majority of the Company’s long-lived assets are marine vessels and related equipment. At any point in time, the Company may employ certain assets outside of the U.S., as needed, to perform work on the Company’s foreign projects.

Subsidiary Guarantors

Subsidiary Guarantors	3 Months Ended
	Mar. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Subsidiary Guarantors	12. Subsidiary guarantors The Company’s long-term debt at March 31, 2017 includes $275,000 of 7.375% senior notes due February 1, 2019. The Company’s obligations under these senior unsecured notes are guaranteed by the Company’s 100% owned domestic subsidiaries. Such guarantees are full, unconditional and joint and several. The following supplemental financial information sets forth for the Company’s subsidiary guarantors (on a combined basis), the Company’s non-guarantor subsidiaries (on a combined basis) and Great Lakes Dredge & Dock Corporation, exclusive of its subsidiaries (“GLDD Corporation”): ( i ) balance sheets as of March 31, 2017 and December 31, 2016; (ii) statements of operations and comprehensive income (loss) for the three months ended March 31, 2017 and 2016; and (iii) statements of cash flows for the three months ended March 31, 2017 and 2016. GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF MARCH 31, 2017 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 6,439 $ 454 $ 2 $ — $ 6,895 Accounts receivable — net 91,385 — — — 91,385 Contract revenues in excess of billings 75,403 293 — — 75,696 Inventories 38,307 — — — 38,307 Prepaid expenses and other current assets 79,545 258 35 — 79,838 Total current assets 291,079 1,005 37 — 292,121 PROPERTY AND EQUIPMENT—Net 419,263 5 — — 419,268 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 84,927 — — — 84,927 INVENTORIES — Noncurrent 51,995 — — — 51,995 INVESTMENTS IN JOINT VENTURES 5,756 — — — 5,756 ASSETS HELD FOR SALE—Noncurrent 9,118 — — — 9,118 RECEIVABLES FROM AFFILIATES 9,350 4,283 165,214 (178,847 ) — INVESTMENTS IN SUBSIDIARIES 3,733 — 533,318 (537,051 ) — OTHER 8,013 1 6,428 — 14,442 TOTAL $ 883,234 $ 5,294 $ 704,997 $ (715,898 ) $ 877,627 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 87,383 $ 257 $ — $ — $ 87,640 Accrued expenses 74,822 995 4,964 — 80,781 Billings in excess of contract revenues 8,893 — — — 8,893 Current portion of long term debt 1,277 — 1,162 — 2,439 Total current liabilities 172,375 1,252 6,126 — 179,753 7 3/8% SENIOR NOTES — — 273,248 — 273,248 REVOLVING CREDIT FACILITY — — 115,500 — 115,500 NOTES PAYABLE — — 12,995 — 12,995 DEFERRED INCOME TAXES (1,833 ) — 59,664 — 57,831 PAYABLES TO AFFILIATES 168,827 4,255 5,765 (178,847 ) — OTHER 6,601 — 171 — 6,772 Total liabilities 345,970 5,507 473,469 (178,847 ) 646,099 TOTAL EQUITY 537,264 (213 ) 231,528 (537,051 ) 231,528 TOTAL $ 883,234 $ 5,294 $ 704,997 $ (715,898 ) $ 877,627 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF DECEMBER 31, 2016 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 11,037 $ 128 $ 2 $ — $ 11,167 Accounts receivable — net 86,690 1,401 — — 88,091 Contract revenues in excess of billings 94,731 281 — — 95,012 Inventories 37,137 — — — 37,137 Prepaid expenses and other current assets 75,496 323 — — 75,819 Total current assets 305,091 2,133 2 — 307,226 PROPERTY AND EQUIPMENT—Net 413,002 6 — — 413,008 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 85,075 — — — 85,075 INVENTORIES — Noncurrent 52,602 — — — 52,602 INVESTMENTS IN JOINT VENTURES 4,734 — — — 4,734 ASSETS HELD FOR SALE—Noncurrent 9,299 — — — 9,299 RECEIVABLES FROM AFFILIATES 11,524 6,883 82,340 (100,747 ) — INVESTMENTS IN SUBSIDIARIES 3,695 — 636,216 (639,911 ) — OTHER 14,692 1 6,951 — 21,644 TOTAL $ 899,714 $ 9,023 $ 725,509 $ (740,658 ) $ 893,588 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 102,654 $ 514 $ 17 $ — $ 103,185 Accrued expenses 58,192 970 9,881 — 69,043 Billings in excess of contract revenues 4,963 178 — — 5,141 Current portion of long term debt 1,320 — 1,145 — 2,465 Total current liabilities 167,129 1,662 11,043 — 179,834 7 3/8% SENIOR NOTES — — 272,998 — 272,998 REVOLVING CREDIT FACILITY — — 104,111 — 104,111 NOTE PAYABLE — — 13,293 — 13,293 DEFERRED INCOME TAXES (1,833 ) — 70,282 — 68,449 PAYABLES TO AFFILIATES 88,573 6,433 5,741 (100,747 ) — OTHER 6,862 — 151 — 7,013 Total liabilities 260,731 8,095 477,619 (100,747 ) 645,698 TOTAL EQUITY 638,983 928 247,890 (639,911 ) 247,890 TOTAL $ 899,714 $ 9,023 $ 725,509 $ (740,658 ) $ 893,588 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS FOR THE THREE MONTHS ENDED MARCH 31, 2017 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals Contract revenues $ 170,451 $ 703 $ — $ (568 ) $ 170,586 Costs of contract revenues (153,173 ) (1,799 ) — 568 (154,404 ) Gross profit 17,278 (1,096 ) — — 16,182 OPERATING EXPENSES: General and administrative expenses 16,789 — 6 — 16,795 Loss on sale of assets—net 11 — — — 11 Operating income (loss) 478 (1,096 ) (6 ) — (624 ) Interest expense—net (11 ) — (5,571 ) — (5,582 ) Equity in earnings (loss) of subsidiaries 6 — (434 ) 428 — Equity in earnings of joint ventures 1 — — — 1 Other income (expense) 215 (7 ) — — 208 Loss from continuing operations before income taxes 689 (1,103 ) (6,011 ) 428 (5,997 ) Income tax (provision) benefit — (14 ) 2,288 — 2,274 Income (loss) from continuing operations 689 (1,117 ) (3,723 ) 428 (3,723 ) Loss from discontinued operations, net of income taxes (20,900 ) — (13,065 ) 20,900 (13,065 ) Net loss $ (20,211 ) $ (1,117 ) $ (16,788 ) $ 21,328 $ (16,788 ) Comprehensive loss $ (20,945 ) $ (1,145 ) $ (17,550 ) $ 22,090 $ (17,550 ) GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) FOR THE THREE MONTHS ENDED MARCH 31, 2016 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals Contract revenues $ 163,579 $ — $ — $ (460 ) $ 163,119 Costs of contract revenues (142,183 ) (1,406 ) — 460 (143,129 ) Gross profit 21,396 (1,406 ) — — 19,990 OPERATING EXPENSES: General and administrative expenses 20,085 4 — — 20,089 Gain on sale of assets—net (10 ) — — — (10 ) Operating income (loss) 1,321 (1,410 ) — — (89 ) Interest expense—net (181 ) — (5,540 ) — (5,721 ) Equity in loss of subsidiaries (82 ) — (1,149 ) 1,231 — Equity in loss of joint ventures (115 ) — — — (115 ) Other expense (755 ) (8 ) — — (763 ) Income (loss) before income taxes 188 (1,418 ) (6,689 ) 1,231 (6,688 ) Income tax (provision) benefit (1 ) — 2,654 — 2,653 Net income (loss) $ 187 $ (1,418 ) $ (4,035 ) $ 1,231 $ (4,035 ) Comprehensive income (loss) $ 187 $ (1,009 ) $ (3,626 ) $ 822 $ (3,626 ) GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 2017 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals OPERATING ACTIVITIES: Cash provided by (used in) operating activities 4,489 (14 ) (9,535 ) — (5,060 ) INVESTING ACTIVITIES: Purchases of property and equipment (17,452 ) — — — (17,452 ) Proceeds from dispositions of property and equipment 265 — — — 265 Changes in restricted cash 7,035 — — — 7,035 Net change in accounts with affiliates — — (82,783 ) 82,783 — Transfer to parent — — 81,000 (81,000 ) — Cash used in investing activities (10,152 ) — (1,783 ) 1,783 (10,152 ) FINANCING ACTIVITIES: Deferred financing fees — — (58 ) — (58 ) Repayments of long term note payable — — (283 ) — (283 ) Taxes paid on settlement of vested share awards — — (164 ) — (164 ) Repayments of equipment debt (376 ) — — — (376 ) Net change in accounts with affiliates 82,441 342 — (82,783 ) — Transfer to parent (81,000 ) — — 81,000 — Exercise of options and purchases from employee stock plans — — 434 — 434 Borrowings under revolving loans — — 28,112 — 28,112 Repayments of revolving loans — — (16,723 ) — (16,723 ) Cash provided by financing activities 1,065 342 11,318 (1,783 ) 10,942 Effect of foreign currency exchange rates on cash and cash equivalents — (2 ) — — (2 ) Net increase (decrease) in cash and cash equivalents (4,598 ) 326 — — (4,272 ) Cash and cash equivalents at beginning of period 11,037 128 2 — 11,167 Cash and cash equivalents at end of period $ 6,439 $ 454 $ 2 $ — $ 6,895 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 2016 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals OPERATING ACTIVITIES: Cash provided by (used in) operating activities $ 14,147 $ (787 ) $ (10,400 ) $ — $ 2,960 INVESTING ACTIVITIES: Purchases of property and equipment (14,917 ) — — — (14,917 ) Proceeds from dispositions of property and equipment 25 — — — 25 Net change in accounts with affiliates 26,753 — — (26,753 ) — Cash provided by investing activities 11,861 — — (26,753 ) (14,892 ) FINANCING ACTIVITIES: Repayments of long term note payable — — (265 ) — (265 ) Repayments of term loan facility — — (1,250 ) — (1,250 ) Repayment of equipment debt (367 ) — — — (367 ) Net change in accounts with affiliates (629 ) 376 (26,500 ) 26,753 — Transfer to parent (23,000 ) — 23,000 — — Exercise of options and purchases from employee stock plans — — 415 — 415 Borrowings under revolving loans — — 38,000 — 38,000 Repayments of revolving loans — — (23,000 ) — (23,000 ) Cash provided by (used in) financing activities (23,996 ) 376 10,400 26,753 13,533 Effect of foreign currency exchange rates on cash and cash equivalents — 109 — — 109 Net increase (decrease) in cash and cash equivalents 2,012 (302 ) — — 1,710 Cash and cash equivalents at beginning of period 12,035 2,147 2 — 14,184 Cash and cash equivalents at end of period $ 14,047 $ 1,845 $ 2 $ — $ 15,894

Basis Of Presentation (Policies

Basis Of Presentation (Policies)	3 Months Ended
	Mar. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2017-04 (“ASU 2017-04”), Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The Company is currently evaluating the impact of ASU 2017-04 on its consolidated financial statements. In November 2016, the FASB issued Accounting Standard Update No. 2016-18 (“ASU 2016-18”), Statement of Cashflows (Topic 230): Restricted Cash In August 2016, the FASB issued Accounting Standard Update No. 2016-15 (“ASU 2016-15”), Classification of Certain Cash Receipts and Cash Payments, In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) In May 2014, the FASB issued Accounting Standard Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) Accounting Standard Updates related to Accounting Standards Codification Topic 606 (collectively, “ASC 606”),

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Computations For Basic And Diluted Loss Per Share	The computations for basic and diluted loss per share are as follows: Three Months Ended (shares in thousands) March 31, 2017 2016 Loss from continuing operations $ (3,723 ) $ (4,035 ) Loss from discontinued operations, net of income taxes (13,065 ) — Net loss (16,788 ) (4,035 ) Weighted-average common shares outstanding — basic 61,065 60,507 Effect of stock options and restricted stock units — — Weighted-average common shares outstanding — diluted 61,065 60,507 Loss per share from continuing operations — basic $ (0.06 ) $ (0.07 ) Loss per share from continuing operations — diluted $ (0.06 ) $ (0.07 )

Accounts Receivable And Contr23

Accounts Receivable And Contracts In Progress (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Schedule Of Accounts Receivable	Accounts receivable at March 31, 2017 and December 31, 2016 are as follows: March 31, December 31, 2017 2016 Completed contracts $ 21,547 $ 18,727 Contracts in progress 57,039 53,137 Retainage 18,021 21,399 96,607 93,263 Allowance for doubtful accounts (747 ) (747 ) Total accounts receivable—net $ 95,860 $ 92,516 Current portion of accounts receivable—net $ 91,385 $ 88,091 Long-term accounts receivable and retainage 4,475 4,425 Total accounts receivable—net $ 95,860 $ 92,516
Components Of Contracts In Progress	The components of contracts in progress at March 31, 2017 and December 31, 2016 are as follows: March 31, December 31, 2017 2016 Costs and earnings in excess of billings: Costs and earnings for contracts in progress $ 553,027 $ 587,371 Amounts billed (499,249 ) (511,548 ) Costs and earnings in excess of billings for contracts in progress 53,778 75,823 Costs and earnings in excess of billings for completed contracts 21,918 19,189 Total contract revenues in excess of billings $ 75,696 $ 95,012 Billings in excess of costs and earnings: Amounts billed $ (341,000 ) $ (268,754 ) Costs and earnings for contracts in progress 332,107 263,613 Total billings in excess of contract revenues $ (8,893 ) $ (5,141 )

Accrued Expenses (Tables)

Accrued Expenses (Tables)	3 Months Ended
	Mar. 31, 2017
Payables And Accruals [Abstract]
Accrued Expenses	Accrued expenses at March 31, 2017 and December 31, 2016 are as follows: March 31, December 31, 2017 2016 Insurance $ 21,996 $ 18,114 Surety bond claim 20,900 — Accumulated deficit in joint ventures 17,016 17,016 Payroll and employee benefits 5,258 10,028 Interest 3,918 8,660 Income and other taxes 2,117 3,208 Percentage of completion adjustment 1,546 3,322 Fuel hedge contracts 468 — Other 7,562 8,695 Total accrued expenses $ 80,781 $ 69,043

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date	The fair values of these financial instruments are summarized as follows: Fair Value Measurements at Reporting Date Using Description At March 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 $ 468 $ — $ 468 $ — Fair Value Measurements at Reporting Date Using Description At December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fuel hedge contracts $ 2,293 $ — $ 2,293 $ —
Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location	The fair value of the fuel hedge contracts outstanding as of March 31, 2017 and December 31, 2016 is as follows: Fair Value at March 31, December 31, Balance Sheet Location 2017 2016 Asset derivatives: Derivatives designated as hedging instruments Fuel hedge contracts Prepaid expenses and other current assets $ — $ 546 Derivatives not designated as hedging instruments Fuel hedge contracts Prepaid expenses and other current assets — 1,747 Total asset derivatives $ — $ 2,293 Liability derivatives: Derivatives designated as hedging instruments Fuel hedge contracts Accrued expenses $ 667 $ — Derivatives not designated as hedging instruments Fuel hedge contracts Accrued expenses (199 ) — Total liability derivatives $ 468 $ —
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 March 31, 2017 2016 Cumulative translation adjustments—net of tax $ (28 ) $ 409 Derivatives: Reclassification of derivative losses to earnings—net of tax 40 — Change in fair value of derivatives—net of tax (774 ) — Net unrealized gain on derivatives—net of tax (734 ) — Total other comprehensive income (loss) $ (762 ) $ 409
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 March 31, Statement of Operations Location 2017 Derivatives: Fuel Costs of contract revenues $ 66 Income tax benefit 26 $ 40

Business Combinations And Dis26

Business Combinations And Dispositions (Tables)	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Schedule Of Discontinued Operations	The Company estimated its exposure to a surety bond claim, including associated expenses, to be $20,900 and has recorded this amount during the first quarter of 2017 in discontinued operations as follows Three Months Ended March 31, 2017 Revenue $ — Loss before income taxes from discontinued operations $ (20,900 ) Income tax benefit 7,835 Loss from discontinued operations, net of income taxes $ (13,065 )

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Segment Reporting By Segment	Three Months Ended March 31, 2017 2016 Dredging Contract revenues $ 153,054 $ 145,013 Operating income 2,106 10,585 Environmental & infrastructure Contract revenues $ 19,224 $ 19,090 Operating loss (2,730 ) (10,674 ) Intersegment revenues $ (1,692 ) $ (984 ) Total Contract revenues $ 170,586 $ 163,119 Operating loss (624 ) (89 )

Subsidiary Guarantors (Tables)

Subsidiary Guarantors (Tables)	3 Months Ended
	Mar. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Consolidating of Balance Sheet	GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF MARCH 31, 2017 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 6,439 $ 454 $ 2 $ — $ 6,895 Accounts receivable — net 91,385 — — — 91,385 Contract revenues in excess of billings 75,403 293 — — 75,696 Inventories 38,307 — — — 38,307 Prepaid expenses and other current assets 79,545 258 35 — 79,838 Total current assets 291,079 1,005 37 — 292,121 PROPERTY AND EQUIPMENT—Net 419,263 5 — — 419,268 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 84,927 — — — 84,927 INVENTORIES — Noncurrent 51,995 — — — 51,995 INVESTMENTS IN JOINT VENTURES 5,756 — — — 5,756 ASSETS HELD FOR SALE—Noncurrent 9,118 — — — 9,118 RECEIVABLES FROM AFFILIATES 9,350 4,283 165,214 (178,847 ) — INVESTMENTS IN SUBSIDIARIES 3,733 — 533,318 (537,051 ) — OTHER 8,013 1 6,428 — 14,442 TOTAL $ 883,234 $ 5,294 $ 704,997 $ (715,898 ) $ 877,627 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 87,383 $ 257 $ — $ — $ 87,640 Accrued expenses 74,822 995 4,964 — 80,781 Billings in excess of contract revenues 8,893 — — — 8,893 Current portion of long term debt 1,277 — 1,162 — 2,439 Total current liabilities 172,375 1,252 6,126 — 179,753 7 3/8% SENIOR NOTES — — 273,248 — 273,248 REVOLVING CREDIT FACILITY — — 115,500 — 115,500 NOTES PAYABLE — — 12,995 — 12,995 DEFERRED INCOME TAXES (1,833 ) — 59,664 — 57,831 PAYABLES TO AFFILIATES 168,827 4,255 5,765 (178,847 ) — OTHER 6,601 — 171 — 6,772 Total liabilities 345,970 5,507 473,469 (178,847 ) 646,099 TOTAL EQUITY 537,264 (213 ) 231,528 (537,051 ) 231,528 TOTAL $ 883,234 $ 5,294 $ 704,997 $ (715,898 ) $ 877,627 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF DECEMBER 31, 2016 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 11,037 $ 128 $ 2 $ — $ 11,167 Accounts receivable — net 86,690 1,401 — — 88,091 Contract revenues in excess of billings 94,731 281 — — 95,012 Inventories 37,137 — — — 37,137 Prepaid expenses and other current assets 75,496 323 — — 75,819 Total current assets 305,091 2,133 2 — 307,226 PROPERTY AND EQUIPMENT—Net 413,002 6 — — 413,008 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 85,075 — — — 85,075 INVENTORIES — Noncurrent 52,602 — — — 52,602 INVESTMENTS IN JOINT VENTURES 4,734 — — — 4,734 ASSETS HELD FOR SALE—Noncurrent 9,299 — — — 9,299 RECEIVABLES FROM AFFILIATES 11,524 6,883 82,340 (100,747 ) — INVESTMENTS IN SUBSIDIARIES 3,695 — 636,216 (639,911 ) — OTHER 14,692 1 6,951 — 21,644 TOTAL $ 899,714 $ 9,023 $ 725,509 $ (740,658 ) $ 893,588 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 102,654 $ 514 $ 17 $ — $ 103,185 Accrued expenses 58,192 970 9,881 — 69,043 Billings in excess of contract revenues 4,963 178 — — 5,141 Current portion of long term debt 1,320 — 1,145 — 2,465 Total current liabilities 167,129 1,662 11,043 — 179,834 7 3/8% SENIOR NOTES — — 272,998 — 272,998 REVOLVING CREDIT FACILITY — — 104,111 — 104,111 NOTE PAYABLE — — 13,293 — 13,293 DEFERRED INCOME TAXES (1,833 ) — 70,282 — 68,449 PAYABLES TO AFFILIATES 88,573 6,433 5,741 (100,747 ) — OTHER 6,862 — 151 — 7,013 Total liabilities 260,731 8,095 477,619 (100,747 ) 645,698 TOTAL EQUITY 638,983 928 247,890 (639,911 ) 247,890 TOTAL $ 899,714 $ 9,023 $ 725,509 $ (740,658 ) $ 893,588
Condensed Consolidating Operations And Comprehensive Income (Loss)	GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS FOR THE THREE MONTHS ENDED MARCH 31, 2017 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals Contract revenues $ 170,451 $ 703 $ — $ (568 ) $ 170,586 Costs of contract revenues (153,173 ) (1,799 ) — 568 (154,404 ) Gross profit 17,278 (1,096 ) — — 16,182 OPERATING EXPENSES: General and administrative expenses 16,789 — 6 — 16,795 Loss on sale of assets—net 11 — — — 11 Operating income (loss) 478 (1,096 ) (6 ) — (624 ) Interest expense—net (11 ) — (5,571 ) — (5,582 ) Equity in earnings (loss) of subsidiaries 6 — (434 ) 428 — Equity in earnings of joint ventures 1 — — — 1 Other income (expense) 215 (7 ) — — 208 Loss from continuing operations before income taxes 689 (1,103 ) (6,011 ) 428 (5,997 ) Income tax (provision) benefit — (14 ) 2,288 — 2,274 Income (loss) from continuing operations 689 (1,117 ) (3,723 ) 428 (3,723 ) Loss from discontinued operations, net of income taxes (20,900 ) — (13,065 ) 20,900 (13,065 ) Net loss $ (20,211 ) $ (1,117 ) $ (16,788 ) $ 21,328 $ (16,788 ) Comprehensive loss $ (20,945 ) $ (1,145 ) $ (17,550 ) $ 22,090 $ (17,550 ) GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) FOR THE THREE MONTHS ENDED MARCH 31, 2016 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals Contract revenues $ 163,579 $ — $ — $ (460 ) $ 163,119 Costs of contract revenues (142,183 ) (1,406 ) — 460 (143,129 ) Gross profit 21,396 (1,406 ) — — 19,990 OPERATING EXPENSES: General and administrative expenses 20,085 4 — — 20,089 Gain on sale of assets—net (10 ) — — — (10 ) Operating income (loss) 1,321 (1,410 ) — — (89 ) Interest expense—net (181 ) — (5,540 ) — (5,721 ) Equity in loss of subsidiaries (82 ) — (1,149 ) 1,231 — Equity in loss of joint ventures (115 ) — — — (115 ) Other expense (755 ) (8 ) — — (763 ) Income (loss) before income taxes 188 (1,418 ) (6,689 ) 1,231 (6,688 ) Income tax (provision) benefit (1 ) — 2,654 — 2,653 Net income (loss) $ 187 $ (1,418 ) $ (4,035 ) $ 1,231 $ (4,035 ) Comprehensive income (loss) $ 187 $ (1,009 ) $ (3,626 ) $ 822 $ (3,626 )
Condensed Consolidating Statement of Cash Flows	GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 2017 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals OPERATING ACTIVITIES: Cash provided by (used in) operating activities 4,489 (14 ) (9,535 ) — (5,060 ) INVESTING ACTIVITIES: Purchases of property and equipment (17,452 ) — — — (17,452 ) Proceeds from dispositions of property and equipment 265 — — — 265 Changes in restricted cash 7,035 — — — 7,035 Net change in accounts with affiliates — — (82,783 ) 82,783 — Transfer to parent — — 81,000 (81,000 ) — Cash used in investing activities (10,152 ) — (1,783 ) 1,783 (10,152 ) FINANCING ACTIVITIES: Deferred financing fees — — (58 ) — (58 ) Repayments of long term note payable — — (283 ) — (283 ) Taxes paid on settlement of vested share awards — — (164 ) — (164 ) Repayments of equipment debt (376 ) — — — (376 ) Net change in accounts with affiliates 82,441 342 — (82,783 ) — Transfer to parent (81,000 ) — — 81,000 — Exercise of options and purchases from employee stock plans — — 434 — 434 Borrowings under revolving loans — — 28,112 — 28,112 Repayments of revolving loans — — (16,723 ) — (16,723 ) Cash provided by financing activities 1,065 342 11,318 (1,783 ) 10,942 Effect of foreign currency exchange rates on cash and cash equivalents — (2 ) — — (2 ) Net increase (decrease) in cash and cash equivalents (4,598 ) 326 — — (4,272 ) Cash and cash equivalents at beginning of period 11,037 128 2 — 11,167 Cash and cash equivalents at end of period $ 6,439 $ 454 $ 2 $ — $ 6,895 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 2016 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals OPERATING ACTIVITIES: Cash provided by (used in) operating activities $ 14,147 $ (787 ) $ (10,400 ) $ — $ 2,960 INVESTING ACTIVITIES: Purchases of property and equipment (14,917 ) — — — (14,917 ) Proceeds from dispositions of property and equipment 25 — — — 25 Net change in accounts with affiliates 26,753 — — (26,753 ) — Cash provided by investing activities 11,861 — — (26,753 ) (14,892 ) FINANCING ACTIVITIES: Repayments of long term note payable — — (265 ) — (265 ) Repayments of term loan facility — — (1,250 ) — (1,250 ) Repayment of equipment debt (367 ) — — — (367 ) Net change in accounts with affiliates (629 ) 376 (26,500 ) 26,753 — Transfer to parent (23,000 ) — 23,000 — — Exercise of options and purchases from employee stock plans — — 415 — 415 Borrowings under revolving loans — — 38,000 — 38,000 Repayments of revolving loans — — (23,000 ) — (23,000 ) Cash provided by (used in) financing activities (23,996 ) 376 10,400 26,753 13,533 Effect of foreign currency exchange rates on cash and cash equivalents — 109 — — 109 Net increase (decrease) in cash and cash equivalents 2,012 (302 ) — — 1,710 Cash and cash equivalents at beginning of period 12,035 2,147 2 — 14,184 Cash and cash equivalents at end of period $ 14,047 $ 1,845 $ 2 $ — $ 15,894

Basis Of Presentation (Narrativ

Basis Of Presentation (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Average equipment-related costs of total costs of contract revenue	23.00%
Number of operating Segments	2
Number of reportable segments	2
Number of reportable segments with goodwill	3

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	1,580	1,812
Securities excluded from computation of earnings per share amount due to loss	678	359

Earnings Per Share - (Computati

Earnings Per Share - (Computations For Basic And Diluted Loss Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Loss from continuing operations	$ (3,723)	$ (4,035)
Loss from discontinued operations, net of income taxes	(13,065)
Net loss	$ (16,788)	$ (4,035)
Weighted-average common shares outstanding — basic	61,065	60,507
Weighted-average common shares outstanding — diluted	61,065	60,507
Loss per share from continuing operations — basic	$ (0.06)	$ (0.07)
Loss per share from continuing operations — diluted	$ (0.06)	$ (0.07)

Accounts Receivable And Contr32

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Completed contracts	$ 21,547	$ 18,727
Contracts in progress	57,039	53,137
Retainage	18,021	21,399
Accounts receivable, gross	96,607	93,263
Allowance for doubtful accounts	(747)	(747)
Total accounts receivable—net	95,860	92,516
Current portion of accounts receivable—net	91,385	88,091
Long-term accounts receivable and retainage	$ 4,475	$ 4,425

Accounts Receivable And Contr33

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 53,778	$ 75,823
Costs and earnings in excess of billings for completed contracts	21,918	19,189
Total contract revenues in excess of billings	75,696	95,012
Total billings in excess of contract revenues	(8,893)	(5,141)
Costs And Earnings In Excess Of Billings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	553,027	587,371
Amounts billed	(499,249)	(511,548)
Billings In Excess Of Costs And Earnings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	332,107	263,613
Amounts billed	$ (341,000)	$ (268,754)

Accounts Receivable And Contr34

Accounts Receivable And Contracts In Progress (Narrative) (Details) $ in Thousands	Mar. 31, 2017USD ($)
Receivables [Abstract]
Costs in excess of billings	$ 17,860

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Insurance	$ 21,996	$ 18,114
Surety bond claim	20,900
Accumulated deficit in joint ventures	17,016	17,016
Payroll and employee benefits	5,258	10,028
Interest	3,918	8,660
Income and other taxes	2,117	3,208
Percentage of completion adjustment	1,546	3,322
Fuel hedge contracts	468
Other	7,562	8,695
Total accrued expenses	$ 80,781	$ 69,043

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	Dec. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016
Debt Instrument [Line Items]
Revolving credit facility		$ 115,500,000
Letters of credit outstanding		62,695,000
Letter of credit remaining borrowing capacity		45,121,000
Purchases of property and equipment		17,452,000	$ 14,917,000
Long-term debt, current maturities		$ 2,439,000			$ 2,465,000
Vessels and Ancillary Equipment [Member]
Debt Instrument [Line Items]
Purchases of property and equipment				$ 15,569,000
Operating leases expiration year		2,023
Long-term debt, current maturities		$ 2,439,000
Long-term debt, excluding current Maturities		14,021,000
7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 275,000,000
Debt instrument, interest rate, stated percentage		7.375%
Maturity date		Feb. 1, 2019
5.75% Senior Notes Due In 2023 [Member] | Vessels and Ancillary Equipment [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.75%
If Redeemed In 2015 [Member] | 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		103.70%
If Redeemed In 2016 [Member] | 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		101.80%
If Redeemed After 2016 [Member] | 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		100.00%
Maximum [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.10%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000
Line of credit facility optional increase capacity	$ 100,000,000
Revolving credit facility, maturity date		Dec. 30, 2019
Revolving credit facility, description		The Credit Agreement matures on December 30, 2019; provided that the maturity date would be accelerated to November 3, 2018 if the Company fails to refinance its unsecured senior notes that mature February 1, 2019. The refinanced notes must have a maturity on or after March 31, 2020.
Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Revolving Credit Facility [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Unused fee percentage	0.375%
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Unused fee percentage	0.25%
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	25,000,000
Prior Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Repayments of lines of credit	$ 199,000,000
Prior Revolving Credit Agreement [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Prior Revolving Credit Agreement [Member] | Maximum [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Prior Revolving Credit Agreement [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Prior Revolving Credit Agreement [Member] | Minimum [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Prior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Payment of secured term loan	$ 50,000,000
Term loan facility bear interest fixed rate	4.655%

Fair Value Measurements (Schedu

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	Mar. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 468	$ 2,293
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 468	$ 2,293

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) gal in Millions	3 Months Ended
	Mar. 31, 2017USD ($)$ / galgal	Dec. 31, 2016USD ($)
Derivatives Fair Value [Line Items]
Derivative underlying hedge percent	80.00%
Derivative, Nonmonetary Notional Amount, Volume | gal	10.6
Fair value hedge assets		$ 2,293,000
Fair value hedge liabilities	$ 468,000
Reclassification of derivative losses to earnings-net of tax	(40,000)
7.375% Senior Notes Due In 2019 [Member]
Derivatives Fair Value [Line Items]
Debt instrument, face amount	$ 275,000,000
Stated interest rate	7.375%
Maturity date	Feb. 1, 2019
7.375% Senior Notes Due In 2019 [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives Fair Value [Line Items]
Fair value of debt	$ 272,608,000
Minimum [Member]
Derivatives Fair Value [Line Items]
Fixed price range | $ / gal	1.49
Maximum [Member]
Derivatives Fair Value [Line Items]
Fixed price range | $ / gal	1.76

Fair Value Measurements (Sche39

Fair Value Measurements (Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Asset derivatives		$ 2,293
Liability derivatives	$ 468
Prepaid Expenses and Other Current Assets [Member] | Derivatives Designated as Hedging Instruments [Member] | Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Asset derivatives		546
Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Asset derivatives		$ 1,747
Accrued Expenses [Member] | Derivatives Designated as Hedging Instruments [Member] | Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Liability derivatives	667
Accrued Expenses [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Liability derivatives, asset offset	$ (199)

Fair Value Measurements (Change

Fair Value Measurements (Changes In Components Of Accumulated Other Comprehensive (Income) Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Cumulative translation adjustments—net of tax	[1]	$ (28)	$ 409
Reclassification of derivative losses to earnings—net of tax		40
Change in fair value of derivatives—net of tax		(774)
Net unrealized gain on derivatives—net of tax	[2]	(734)
Other comprehensive income (loss)—net of tax		$ (762)	$ 409
[1]	Net of income tax (provision) benefit of $39 and $(271) for the three months ended March 31, 2017 and 2016, respectively.
[2]	Net of income tax provision of $479 for the three months ended March 31, 2017.

Fair Value Measurements (Adjust

Fair Value Measurements (Adjustments Reclassified From Accumulated Balances Other Comprehensive Income (Loss) To Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	$ (154,404)	$ (143,129)
Income tax benefit	(2,274)	(2,653)
Net income (loss)	16,788	$ 4,035
Fuel Hedge Contracts [Member] | Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges | Reclassification Out Of Accumulated Other Comprehensive Income
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	66
Income tax benefit	26
Net income (loss)	$ 40

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units	612
Share-based compensation expense	$ 918	$ 927
Employees And Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant	5,800

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details) - USD ($)	Feb. 28, 2017	Jan. 14, 2015	Mar. 31, 2017
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 1,188,986,000
Revenue value remaining from outstanding performance bonds			429,600,000
Proceeds from Legal Settlements		$ 5,309,000
Surety Bond [Member]
Commitments And Contingencies [Line Items]
Aggregate demolition surety performance bond	$ 20,000,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 1,000,000
Warranty periods			1 year
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 10,000,000
Warranty periods			3 years
Environmental And Infrastructure Segment [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 44,934,000

Investments (Details)

Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2017
Schedule Of Equity Method Investments [Line Items]
Prepaid expenses and other current assets	$ 75,819	$ 79,838
Accumulated deficit in joint ventures	17,016	$ 17,016
TerraSea Environmental Solutions [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage		50.00%
Prepaid expenses and other current assets	24,696	$ 24,703
Accumulated deficit in joint ventures	17,016	$ 17,016
Provision for losses to be assumed from joint venture	$ 2,634

Business Combinations And Dis45

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

Business Combinations And Dis46

Business Combinations And Dispositions - (Schedule Of Discontinued Operations) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Business Combinations [Abstract]
Loss before income taxes from discontinued operations	$ (20,900)
Income tax benefit	7,835
Loss from discontinued operations, net of income taxes	$ (13,065)

Segment Information (Narrative)

Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)segment	Mar. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Contract revenues	$ 170,586	$ 163,119
Dredging Segment [Member] | Foreign [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 19,154	$ 1,509

Segment Information (Segment Re

Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Contract revenues	$ 170,586	$ 163,119
Operating income (loss)	(624)	(89)
Dredging Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	2,106	10,585
Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(2,730)	(10,674)
Operating Segment [Member] | Dredging Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	153,054	145,013
Operating Segment [Member] | Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	19,224	19,090
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ (1,692)	$ (984)

Subsidiary Guarantors (Narrativ

Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
7 3/8% SENIOR NOTES	$ 273,248	$ 272,998
Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
7 3/8% SENIOR NOTES	$ 275,000
Debt instrument, interest rate, stated percentage	7.375%
Owned Domestic Subsidiaries Percent	100.00%

Subsidiary Guarantors (Condense

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 6,895	$ 11,167	$ 15,894	$ 14,184
Accounts receivable—net	91,385	88,091
Contract revenues in excess of billings	75,696	95,012
Inventories	38,307	37,137
Prepaid expenses and other current assets	79,838	75,819
Total current assets	292,121	307,226
PROPERTY AND EQUIPMENT—Net	419,268	413,008
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,927	85,075
INVENTORIES—Noncurrent	51,995	52,602
INVESTMENTS IN JOINT VENTURES	5,756	4,734
ASSETS HELD FOR SALE—Noncurrent	9,118	9,299
OTHER	14,442	21,644
TOTAL	877,627	893,588
LIABILITIES AND EQUITY
Accounts payable	87,640	103,185
Accrued expenses	80,781	69,043
Billings in excess of contract revenues	8,893	5,141
Current portion of long term debt	2,439	2,465
Total current liabilities	179,753	179,834
7 3/8% SENIOR NOTES	273,248	272,998
REVOLVING CREDIT FACILITY	115,500	104,111
NOTES PAYABLE	12,995	13,293
DEFERRED INCOME TAXES	57,831	68,449
OTHER	6,772	7,013
Total liabilities	646,099	645,698
TOTAL EQUITY	231,528	247,890	249,889	252,173
TOTAL	877,627	893,588
Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	6,439	11,037	14,047	12,035
Accounts receivable—net	91,385	86,690
Contract revenues in excess of billings	75,403	94,731
Inventories	38,307	37,137
Prepaid expenses and other current assets	79,545	75,496
Total current assets	291,079	305,091
PROPERTY AND EQUIPMENT—Net	419,263	413,002
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,927	85,075
INVENTORIES—Noncurrent	51,995	52,602
INVESTMENTS IN JOINT VENTURES	5,756	4,734
ASSETS HELD FOR SALE—Noncurrent	9,118	9,299
RECEIVABLES FROM AFFILIATES	9,350	11,524
INVESTMENTS IN SUBSIDIARIES	3,733	3,695
OTHER	8,013	14,692
TOTAL	883,234	899,714
LIABILITIES AND EQUITY
Accounts payable	87,383	102,654
Accrued expenses	74,822	58,192
Billings in excess of contract revenues	8,893	4,963
Current portion of long term debt	1,277	1,320
Total current liabilities	172,375	167,129
DEFERRED INCOME TAXES	(1,833)	(1,833)
PAYABLES TO AFFILIATES	168,827	88,573
OTHER	6,601	6,862
Total liabilities	345,970	260,731
TOTAL EQUITY	537,264	638,983
TOTAL	883,234	899,714
Non Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	454	128	1,845	2,147
Accounts receivable—net		1,401
Contract revenues in excess of billings	293	281
Prepaid expenses and other current assets	258	323
Total current assets	1,005	2,133
PROPERTY AND EQUIPMENT—Net	5	6
RECEIVABLES FROM AFFILIATES	4,283	6,883
OTHER	1	1
TOTAL	5,294	9,023
LIABILITIES AND EQUITY
Accounts payable	257	514
Accrued expenses	995	970
Billings in excess of contract revenues		178
Total current liabilities	1,252	1,662
PAYABLES TO AFFILIATES	4,255	6,433
Total liabilities	5,507	8,095
TOTAL EQUITY	(213)	928
TOTAL	5,294	9,023
GLDD Corporation [Member]
CURRENT ASSETS:
Cash and cash equivalents	2	2	$ 2	$ 2
Prepaid expenses and other current assets	35
Total current assets	37	2
RECEIVABLES FROM AFFILIATES	165,214	82,340
INVESTMENTS IN SUBSIDIARIES	533,318	636,216
OTHER	6,428	6,951
TOTAL	704,997	725,509
LIABILITIES AND EQUITY
Accounts payable		17
Accrued expenses	4,964	9,881
Current portion of long term debt	1,162	1,145
Total current liabilities	6,126	11,043
7 3/8% SENIOR NOTES	273,248	272,998
REVOLVING CREDIT FACILITY	115,500	104,111
NOTES PAYABLE	12,995	13,293
DEFERRED INCOME TAXES	59,664	70,282
PAYABLES TO AFFILIATES	5,765	5,741
OTHER	171	151
Total liabilities	473,469	477,619
TOTAL EQUITY	231,528	247,890
TOTAL	704,997	725,509
Consolidation Eliminations [Member]
CURRENT ASSETS:
RECEIVABLES FROM AFFILIATES	(178,847)	(100,747)
INVESTMENTS IN SUBSIDIARIES	(537,051)	(639,911)
TOTAL	(715,898)	(740,658)
LIABILITIES AND EQUITY
PAYABLES TO AFFILIATES	(178,847)	(100,747)
Total liabilities	(178,847)	(100,747)
TOTAL EQUITY	(537,051)	(639,911)
TOTAL	$ (715,898)	$ (740,658)

Subsidiary Guarantors (Conden51

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 170,586	$ 163,119
Costs of contract revenues	(154,404)	(143,129)
Gross profit	16,182	19,990
General and administrative expenses	16,795	20,089
(Gain) loss on sale of assets—net	11	(10)
Operating loss	(624)	(89)
Interest expense—net	(5,582)	(5,721)
Equity in earnings (loss) of joint ventures	1	(115)
Other income (expense)	208	(763)
Loss from continuing operations before income taxes	(5,997)	(6,688)
Income tax (provision) benefit	2,274	2,653
Loss from continuing operations	(3,723)	(4,035)
Loss from discontinued operations, net of income taxes	(13,065)
Net loss	(16,788)	(4,035)
Comprehensive income (loss)	(17,550)	(3,626)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	170,451	163,579
Costs of contract revenues	(153,173)	(142,183)
Gross profit	17,278	21,396
General and administrative expenses	16,789	20,085
(Gain) loss on sale of assets—net	11	(10)
Operating loss	478	1,321
Interest expense—net	(11)	(181)
Equity in earnings (loss) of subsidiaries	6	(82)
Equity in earnings (loss) of joint ventures	1	(115)
Other income (expense)	215	(755)
Loss from continuing operations before income taxes	689	188
Income tax (provision) benefit		(1)
Loss from continuing operations	689
Loss from discontinued operations, net of income taxes	(20,900)
Net loss	(20,211)	187
Comprehensive income (loss)	(20,945)	187
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	703
Costs of contract revenues	(1,799)	(1,406)
Gross profit	(1,096)	(1,406)
General and administrative expenses		4
Operating loss	(1,096)	(1,410)
Other income (expense)	(7)	(8)
Loss from continuing operations before income taxes	(1,103)	(1,418)
Income tax (provision) benefit	(14)
Loss from continuing operations	(1,117)
Net loss	(1,117)	(1,418)
Comprehensive income (loss)	(1,145)	(1,009)
GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
General and administrative expenses	6
Operating loss	(6)
Interest expense—net	(5,571)	(5,540)
Equity in earnings (loss) of subsidiaries	(434)	(1,149)
Loss from continuing operations before income taxes	(6,011)	(6,689)
Income tax (provision) benefit	2,288	2,654
Loss from continuing operations	(3,723)
Loss from discontinued operations, net of income taxes	(13,065)
Net loss	(16,788)	(4,035)
Comprehensive income (loss)	(17,550)	(3,626)
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(568)	(460)
Costs of contract revenues	568	460
Equity in earnings (loss) of subsidiaries	428	1,231
Loss from continuing operations before income taxes	428	1,231
Loss from continuing operations	428
Loss from discontinued operations, net of income taxes	20,900
Net loss	21,328	1,231
Comprehensive income (loss)	$ 22,090	$ 822

Subsidiary Guarantors (Conden52

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	$ (5,060)	$ 2,960
INVESTING ACTIVITIES:
Purchases of property and equipment	(17,452)	(14,917)
Proceeds from dispositions of property and equipment	265	25
Changes in restricted cash	7,035
Net cash flows used in investing activities	(10,152)	(14,892)
FINANCING ACTIVITIES:
Deferred financing fees	(58)
Repayments of long term note payable	(283)	(265)
Taxes paid on settlement of vested share awards	(164)
Repayments of term loan facility		(1,250)
Repayments of equipment debt	(376)	(367)
Exercise of options and purchases from employee stock plans	434	415
Borrowings under revolving loans	28,112	38,000
Repayments of revolving loans	(16,723)	(23,000)
Cash provided by financing activities	10,942	13,533
Effect of foreign currency exchange rates on cash and cash equivalents	(2)	109
Net increase (decrease) in cash and cash equivalents	(4,272)	1,710
Cash and cash equivalents at beginning of period	11,167	14,184
Cash and cash equivalents at end of period	6,895	15,894
Consolidation Eliminations [Member]
INVESTING ACTIVITIES:
Net change in accounts with affiliates	82,783	(26,753)
Transfer to parent	(81,000)
Net cash flows used in investing activities	1,783	(26,753)
FINANCING ACTIVITIES:
Net change in accounts with affiliates	(82,783)	26,753
Transfer to parent	81,000
Cash provided by financing activities	(1,783)	26,753
Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	4,489	14,147
INVESTING ACTIVITIES:
Purchases of property and equipment	(17,452)	(14,917)
Proceeds from dispositions of property and equipment	265	25
Changes in restricted cash	7,035
Net change in accounts with affiliates		26,753
Net cash flows used in investing activities	(10,152)	11,861
FINANCING ACTIVITIES:
Repayments of equipment debt	(376)	(367)
Net change in accounts with affiliates	82,441	(629)
Transfer to parent	(81,000)	(23,000)
Cash provided by financing activities	1,065	(23,996)
Net increase (decrease) in cash and cash equivalents	(4,598)	2,012
Cash and cash equivalents at beginning of period	11,037	12,035
Cash and cash equivalents at end of period	6,439	14,047
Non Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	(14)	(787)
FINANCING ACTIVITIES:
Net change in accounts with affiliates	342	376
Cash provided by financing activities	342	376
Effect of foreign currency exchange rates on cash and cash equivalents	(2)	109
Net increase (decrease) in cash and cash equivalents	326	(302)
Cash and cash equivalents at beginning of period	128	2,147
Cash and cash equivalents at end of period	454	1,845
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Cash provided by (used in) operating activities	(9,535)	(10,400)
INVESTING ACTIVITIES:
Net change in accounts with affiliates	(82,783)
Transfer to parent	81,000
Net cash flows used in investing activities	(1,783)
FINANCING ACTIVITIES:
Deferred financing fees	(58)
Repayments of long term note payable	(283)	(265)
Taxes paid on settlement of vested share awards	(164)
Repayments of term loan facility		(1,250)
Net change in accounts with affiliates		(26,500)
Transfer to parent		23,000
Exercise of options and purchases from employee stock plans	434	415
Borrowings under revolving loans	28,112	38,000
Repayments of revolving loans	(16,723)	(23,000)
Cash provided by financing activities	11,318	10,400
Cash and cash equivalents at beginning of period	2	2
Cash and cash equivalents at end of period	$ 2	$ 2