Great Lakes Dredge & Dock (GLDD) 10-Q 3 May 16 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 29, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
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		60,656,931

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 15,894	$ 14,184
Accounts receivable—net	101,000	130,777
Contract revenues in excess of billings	74,576	81,195
Inventories	35,042	35,963
Prepaid expenses and other current assets	71,985	67,614
Total current assets	298,497	329,733
PROPERTY AND EQUIPMENT—Net	432,749	430,210
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	85,774	86,004
INVENTORIES—Noncurrent	45,170	41,646
INVESTMENTS IN JOINT VENTURES	3,131	3,761
OTHER	7,181	6,770
TOTAL	872,502	898,124
CURRENT LIABILITIES:
Accounts payable	96,499	118,846
Accrued expenses	61,596	72,277
Billings in excess of contract revenues	6,158	7,061
Current portion of long term debt	7,530	7,506
Total current liabilities	171,783	205,690
7 3/8% SENIOR NOTES	272,248	271,998
REVOLVING CREDIT FACILITY	35,000	20,000
NOTES PAYABLE	52,265	53,792
DEFERRED INCOME TAXES	71,624	74,006
OTHER	19,693	20,465
Total liabilities	$ 622,613	$ 645,951
COMMITMENTS AND CONTINGENCIES (Note 8)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 60,934 and 60,709 shares issued; 60,656 and 60,431 shares outstanding at March 31, 2016 and December 31, 2015, respectively.	$ 6	$ 6
Treasury stock, at cost	(1,433)	(1,433)
Additional paid-in capital	284,589	283,247
Accumulated deficit	(31,699)	(27,664)
Accumulated other comprehensive loss	(1,574)	(1,983)
Total equity	249,889	252,173
TOTAL	$ 872,502	$ 898,124

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	60,934,000	60,709,000
Common stock, shares outstanding	60,656,000	60,431,000

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Contract revenues	$ 163,119	$ 174,557
Costs of contract revenues	143,129	163,875
Gross profit	19,990	10,682
General and administrative expenses	20,089	17,948
(Gain) loss on sale of assets—net	(10)	(8)
Operating loss	(89)	(7,258)
Interest expense—net	(5,721)	(5,630)
Equity in loss of joint ventures	(115)	(1,098)
Other expense	(763)	(441)
Loss before income taxes	(6,688)	(14,427)
Income tax benefit	2,653	6,037
Net loss	$ (4,035)	$ (8,390)
Basic loss per share	$ (0.07)	$ (0.14)
Basic weighted average shares	60,507	60,265
Diluted loss per share	$ (0.07)	$ (0.14)
Diluted weighted average shares	60,507	60,265

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (4,035)	$ (8,390)
Currency translation adjustment—net of tax	[1]	409	(808)
Comprehensive loss		$ (3,626)	$ (9,198)
[1]	Net of income tax (provision) benefit of $(271) and $536 for the three months ended March 31, 2016 and 2015, respectively.

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ (271)	$ 536

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, 2014	$ 255,963	$ 6		$ 278,166	$ (21,475)	$ (734)
BALANCE - shares at Dec. 31, 2014		60,170
Share-based compensation, Value	1,057			1,057
Share-based compensation, Shares		67
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(13)			(13)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		3
Exercise of options and purchases from employee stock plans, Value	736			736
Exercise of options and purchases from employee stock plans, Shares		139
Excess income tax benefit from share-based compensation	8			8
Net loss	(8,390)				(8,390)
Other comprehensive income (loss)—net of tax	(808)					(808)
BALANCE - value at Mar. 31, 2015	248,553	$ 6		279,954	(29,865)	(1,542)
BALANCE - shares at Mar. 31, 2015		60,379
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)

Condensed Consolidated Stateme8

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES:
Net loss	$ (4,035)	$ (8,390)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	13,928	13,153
Equity in (earnings) loss of joint ventures	(419)	1,098
Deferred income taxes	(2,108)	(6,045)
Gain on sale of assets	(10)	(8)
Amortization of deferred financing fees	623	492
Unrealized net gain from mark-to-market valuations of derivatives	(1,332)	(1,051)
Unrealized foreign currency gain	(77)	(736)
Share-based compensation expense	927	1,057
Excess income tax benefit from share-based compensation		(8)
Changes in assets and liabilities:
Accounts receivable	29,748	37,746
Contract revenues in excess of billings	6,748	(20,160)
Inventories	(2,603)	1,572
Prepaid expenses and other current assets	(3,418)	(1,114)
Accounts payable and accrued expenses	(33,322)	(24,463)
Billings in excess of contract revenues	(910)	(2,245)
Other noncurrent assets and liabilities	(780)	(1,475)
Cash provided by (used in) operating activities	2,960	(10,577)
INVESTING ACTIVITIES:
Purchases of property and equipment	(14,917)	(20,777)
Proceeds from dispositions of property and equipment	25	40
Net cash flows used in investing activities	(14,892)	(20,737)
FINANCING ACTIVITIES:
Deferred financing fees		(29)
Repayments of long term note payable	(265)
Taxes paid on settlement of vested share awards		(13)
Repayments of term loan facility	(1,250)	(1,250)
Repayments of equipment debt	(367)	(214)
Proceeds from equipment debt		408
Exercise of options and purchases from employee stock plans	415	736
Excess income tax benefit from share-based compensation		8
Borrowings under revolving loans	38,000	53,000
Repayments of revolving loans	(23,000)	(33,000)
Net cash provided by financing activities	13,533	19,646
Effect of foreign currency exchange rates on cash and cash equivalents	109	(102)
Net increase (decrease) in cash and cash equivalents	1,710	(11,770)
Cash and cash equivalents at beginning of period	14,184	42,389
Cash and cash equivalents at end of period	15,894	30,619
Supplemental Cash Flow Information
Cash paid for interest	11,276	11,068
Cash paid (refunded) for income taxes	(1)	368
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 10,003	7,301
Property and equipment purchased on notes payable		$ 15,569

Basis Of Presentation Policies

Basis Of Presentation Policies	3 Months Ended
	Mar. 31, 2016
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, 2015. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of March 31, 2016, and its results of operations for the three months ended March 31, 2016 and 2015 and cash flows for the three months ended March 31, 2016 and 2015 have been included. The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel, supplies, short-term rentals and project overhead. Hourly labor is generally hired on a project-by-project basis. Costs of contract revenues vary significantly depending on the type and location of work performed and assets utilized. The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. These costs have averaged approximately 21% of total costs of contract revenues over the prior three years. During the year, both equipment utilization and the timing of fixed cost expenditures fluctuate significantly. Accordingly, the Company allocates these fixed equipment costs to interim periods in proportion to revenues recognized over the year, to better match revenues and expenses. Specifically, at each interim reporting date the Company compares actual revenues earned to date on its dredging contracts to expected annual revenues and recognizes equipment costs on the same proportionate basis. In the fourth quarter, any over or under allocated equipment costs are recognized such that the expense for the year equals actual equipment costs incurred during the year. The Company has three operating segments: dredging, Terra Contracting Services, LLC (“Terra”) and Great Lakes Environmental & Infrastructure, LLC (“GLEI”), previously referred to as Magnus Pacific, LLC, which were aggregated into two reportable segments: dredging and environmental & infrastructure, previously referred to as environmental & remediation. As Terra and GLEI have similarity in economic margins, services, production processes, customer types, distribution methods and regulatory environment, they were aggregated into one reporting segment. There has been no change in the Company’s identification of operating segments and reportable segments. The Company has determined that the operating segments are the Company’s three reporting units. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2016. The condensed consolidated results of operations and comprehensive income for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year. Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) In November 2015, the FASB issued Accounting Standard Update No. 2015-17 (“ASU 2015-17”), Income Taxes: Balance Sheet Classifications of Deferred Taxes (Topic 740) In April 2015, the FASB issued Accounting Standard Update No. 2015-03 (“ASU 2015-03”), Interest - Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs In May 2014, the FASB issued Accounting Standard Update No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers (Topic 606)

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2016
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, 2016 and 2015, the dilutive effect of 359 thousand and 534 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, 2016, 1,812 thousand stock options and restricted stock units were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method, as such stock options and restricted stock units were determined to be anti-dilutive. The computations for basic and diluted loss per share are as follows: Three Months Ended (shares in thousands) March 31, 2016 2015 Net loss $ (4,035 ) $ (8,390 ) Weighted-average common shares outstanding — basic and diluted 60,507 60,265 Loss per share — $ (0.07 ) $ (0.14 ) Loss per share — diluted $ (0.07 ) $ (0.14 )

Accounts Receivable And Contrac

Accounts Receivable And Contracts In Progress	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Accounts receivable and contracts in progress	3. Accounts receivable and contracts in progress Accounts receivable at March 31, 2016 and December 31, 2015 are as follows: March 31, December 31, 2016 2015 Completed contracts $ 37,324 $ 37,111 Contracts in progress 50,669 70,787 Retainage 17,088 27,203 105,081 135,101 Allowance for doubtful accounts (439 ) (754 ) Total accounts receivable—net $ 104,642 $ 134,347 Current portion of accounts receivable—net $ 101,000 $ 130,777 Long-term accounts receivable and retainage 3,642 3,570 Total accounts receivable—net $ 104,642 $ 134,347 The components of contracts in progress at March 31, 2016 and December 31, 2015 are as follows: March 31, December 31, 2016 2015 Costs and earnings in excess of billings: Costs and earnings for contracts in progress $ 375,747 $ 230,159 Amounts billed (332,037 ) (176,283 ) Costs and earnings in excess of billings for contracts in progress 43,710 53,876 Costs and earnings in excess of billings for completed contracts 30,866 27,319 Total contract revenues in excess of billings $ 74,576 $ 81,195 Billings in excess of costs and earnings: Amounts billed $ (176,226 ) $ (207,550 ) Costs and earnings for contracts in progress 170,068 200,489 Total billings in excess of contract revenues $ (6,158 ) $ (7,061 ) The Company has $17,910 included in costs in excess of billings that are dependent upon the sale of environmental credits earned for a wetland mitigation project. The sale of these credits is subject to market factors that could cause the amount of expected revenue to be higher or lower than currently estimated. If the amount of proceeds received from the sale of the environmental credits is lower than our expectations, we could sustain a loss of part or all of the costs incurred related to this project. Additionally, the timing of realization may be impacted by the timing of a delay in the sale of these environmental credits, resulting in a longer period to recover our investment.

Accrued Expenses

Accrued Expenses	3 Months Ended
	Mar. 31, 2016
Payables And Accruals [Abstract]
Accrued Expenses	4. Accrued expenses Accrued expenses at March 31, 2016 and December 31, 2015 are as follows: March 31, December 31, 2016 2015 Insurance $ 16,728 $ 16,291 Accumulated deficit in joint ventures 14,359 15,408 Payroll and employee benefits 10,345 13,317 Interest 4,008 8,743 Percentage of completion adjustment 3,197 2,837 Fuel hedge contracts 3,056 4,388 Income and other taxes 1,845 3,726 Other 8,058 7,567 Total accrued expenses $ 61,596 $ 72,277

Long-term Debt

Long-term Debt	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	5. Long-term debt Credit Agreement On June 4, 2012, the Company entered into a senior revolving credit agreement, as subsequently amended, (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender and an Issuing Lender, Bank of America, N.A., as Syndication Agent and PNC Bank, National Association, BMO Harris Bank N.A. and Fifth Third Bank, as Co-Documentation Agents. The Credit Agreement provides for a senior revolving credit facility in an aggregate principal amount of up to $210,000, multicurrency borrowings up to a $50,000 sublimit and swingline loans up to a $10,000 sublimit. The Credit Agreement also includes an incremental loans feature that will allow the Company to increase the senior revolving credit facility by an aggregate principal amount of up to $15,000. This feature is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, and the Company being in pro forma compliance with the existing financial covenants, both before and after giving effect to the increase, and subject to other standard conditions. The Credit Agreement is collateralized by a substantial portion of the Company’s operating equipment with a net book value at March 31, 2016 of $148,785. Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the revolving credit facility will bear interest at the option of the Company at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum. The Credit Agreement contains affirmative, negative and financial covenants customary for financings of this type. The Credit Agreement also contains customary events of default (including non-payment of principal or interest on any material debt and breaches of covenants) as well as events of default relating to certain actions by the Company’s surety bonding provider. The Credit Agreement requires the Company to maintain a net leverage ratio less than or equal to 4.50 to 1.00 as of the end of each fiscal quarter and a minimum fixed charge coverage ratio of 1.25 to 1.00. The obligations of Great Lakes under the Credit Agreement are unconditionally guaranteed, on a joint and several basis, by each existing and subsequently acquired or formed material direct and indirect domestic subsidiary of the Company. During a year, the Company frequently borrows and repays amounts under its revolving credit facility. As of March 31, 2016, the Company had $35,000 of borrowings on the revolver and $49,360 of letters of credit outstanding, resulting in $125,640 of availability under the Credit Agreement. At March 31, 2016, the Company was in compliance with its various financial covenants under the Credit Agreement. Term loan facility On November 4, 2014, the Company entered into a senior secured term loan facility consisting of a term loan in an aggregate principal amount of $50,000 (the “Term Loan Facility”) pursuant to a Loan and Security Agreement (the “Loan Agreement”) by and among the lenders party thereto from time to time and Bank of America, N.A., as administrative agent. The Company has borrowed an aggregate principal amount of $47,360 in 2014 and an additional $2,640 in 2015. The proceeds from the Term Loan Facility will be used for the working capital and general corporate purposes of the Company, including to repay borrowings under the Credit Agreement made to finance the construction of the Company’s dual mode articulated tug/barge trailing suction hopper dredge (the “ATB”). The Term Loan Facility has a term of 5 years. The borrowings under the Term Loan Facility bear interest at a fixed rate of 4.655% per annum. If an event of default occurs under the Loan Agreement, the interest rate will increase by 2.00% per annum during the continuance of such event of default. The Term Loan Facility provides for monthly amortization payments, payable in arrears, which commenced on December 4, 2014, at an annual amount of (i) approximately 10% of the principal amount of the Term Loan Facility during the first two years of the term, (ii) approximately 20% of the principal amount of the Term Loan Facility during the third and fourth years of the term, and (iii) approximately 25% of the principal amount of the Term Loan Facility during the final year of the term, with the remainder due on the maturity date of the facility. In addition, the Company has usual and customary mandatory prepayment provisions and may optionally prepay the Term Loan Facility in whole or in part at any time, subject to a minimum prepayment amount. The Loan Agreement includes customary representations, affirmative and negative covenants and events of default for financings of this type and includes the same financial covenants that are currently set forth in the Credit Agreement. The Term Loan Facility is collateralized by a portion of the Company’s operating equipment with a net book value at March 31, 2016 of $49,227. 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 $2,396. The long term portion is $16,488 and is included in notes payable or other long term liabilities.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
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, 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 $ 3,056 $ — $ 3,056 $ — Fair Value Measurements at Reporting Date Using Description At December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fuel hedge contracts $ 4,388 $ — $ 4,388 $ — Fuel hedge contracts The Company is exposed to certain market risks, primarily commodity price risk as it relates to the diesel fuel purchase requirements, which occur in the normal course of business. The Company enters into heating oil commodity swap contracts to hedge the risk that fluctuations in diesel fuel prices will have an adverse impact on cash flows associated with its domestic dredging contracts. The Company’s goal is to hedge approximately 80% of the fuel requirements for work in domestic backlog. As of March 31, 2016, the Company was party to various swap arrangements to hedge the price of a portion of its diesel fuel purchase requirements for work in its backlog to be performed through March 2017. As of March 31, 2016, there were 12.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through March 2017. Under these swap agreements, the Company will pay fixed prices ranging from $1.02 to $2.11 per gallon. At March 31, 2016 and December 31, 2015, the fair value liability of the fuel hedge contracts was estimated to be $3,056 and $4,388, respectively, and is recorded in accrued expenses. Changes in the fair value of fuel hedge contracts being recorded in the Statement of Operations are recorded as cost of contract revenues. The fair values of fuel hedges are corroborated using inputs that are readily observable in public markets; therefore, the Company determines fair value of these fuel hedges using Level 2 inputs. The Company is exposed to counterparty credit risk associated with non-performance of its various derivative instruments. The Company’s risk would be limited to any unrealized gains on current positions. To help mitigate this risk, the Company transacts only with counterparties that are rated as investment grade or higher. In addition, all counterparties are monitored on a continuous basis. The fair value of the fuel hedge contracts outstanding as of March 31, 2016 and December 31, 2015 is as follows: Fair Value at March 31, December 31, Balance Sheet Location 2016 2015 Liability derivatives: Derivatives not designated as hedging instruments Fuel hedge contracts Accrued expenses $ 3,056 $ 4,388 Accumulated other comprehensive loss Changes in the components of the accumulated balances of other comprehensive (income) loss are as follows: Three Months Ended March 31, 2016 2015 Cumulative translation adjustments—net of tax $ 409 $ (808 ) Other financial instruments The carrying value of financial instruments included in current assets and current liabilities approximates fair value due to the short-term maturities of these instruments. Based on timing of the cash flows and comparison to current market interest rates, the carrying value of our senior revolving credit agreement approximates fair value. The Term Loan Facility approximates fair value based upon stable market interest rates and Company credit ratings from inception to year end. In January 2011 and again in November 2014, the Company issued a total of $275,000 of 7.375% senior notes due February 1, 2019, which were outstanding at March 31, 2016 (See Note 5). The senior notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the senior notes. The fair value of the senior notes was $260,563 at March 31, 2016, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets. It is impracticable to determine the fair value of outstanding letters of credit or performance, bid and payment bonds due to uncertainties as to the amount and timing of future obligations, if any.

Share-Based Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2016
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 2016, the Company granted 661 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 $927 and $1,057 for the three months ended March 31, 2016 and 2015, respectively.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2016
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 a bonding agreement with Zurich American Insurance Company (“Zurich”) under which the Company can obtain performance, bid and payment bonds (the “Zurich Bonding Agreement”). In April 2015, we entered into additional bonding agreements with ACE Holdings, Inc., Argonaut Insurance Company, Berkley Insurance Company, and Liberty Mutual Insurance Company (collectively, the “Additional Sureties”). The bonding agreements with the Additional Sureties contain similar terms and conditions as the Zurich Bonding Agreement. The Company also has outstanding bonds with Travelers Casualty and Surety Company of America. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At March 31, 2016, the Company had outstanding performance bonds with a notional amount of approximately $1,093,262, of which $41,082 relates to projects from the Company’s historical demolition business. The revenue value remaining in backlog related to these projects totaled approximately $579,451. In connection with the sale of our historical demolition business, the Company was obligated to keep in place the surety bonds on pending demolition projects for the period required under the respective contract for a project. Certain foreign projects performed by the Company have warranty periods, typically spanning no more than one to three years beyond project completion, whereby the Company retains responsibility to maintain the project site to certain specifications during the warranty period. Generally, any potential liability of the Company is mitigated by insurance, shared responsibilities with consortium partners, and/or recourse to owner-provided specifications. Legal proceedings and other contingencies As is customary with negotiated contracts and modifications or claims to competitively bid contracts with the federal government, the government has the right to audit the books and records of the Company to ensure compliance with such contracts, modifications, or claims, and the applicable federal laws. The government has the ability to seek a price adjustment based on the results of such audit. Any such audits have not had, and are not expected to have, a material impact on the financial position, operations, or cash flows of the Company. Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against the Company and certain of its subsidiaries. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved, or settled adversely to the Company. Although the Company is subject to various claims and legal actions that arise in the ordinary course of business, except as described below, the Company is not currently a party to any material legal proceedings or environmental claims. The Company records an accrual when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. The Company does not believe any of these proceedings, individually or in the aggregate, would be expected to have a material effect on results of operations, cash flows or financial condition. On April 23, 2014, the Company completed the sale of NASDI, LLC (“NASDI”) and Yankee Environmental Services, LLC (“Yankee”), which together comprised the Company’s historical demolition business, to a privately owned demolition company. Under the terms of the divestiture, the Company retained certain pre-closing liabilities relating to the disposed business. Certain of these liabilities and a legal action brought by the Company to enforce the buyer’s obligations under the sale agreement are described below. In 2009, NASDI received a letter stating that the Attorney General for the Commonwealth of Massachusetts is investigating alleged violations of the Massachusetts Solid Waste Act. The Company believes that the Massachusetts Attorney General is investigating waste disposal activities at an allegedly unpermitted disposal site owned by a third party with whom NASDI contracted for the disposal of waste materials in 2007 and 2008. Per the Massachusetts Attorney General’s request, NASDI executed a tolling agreement regarding the matter in 2009 and engaged in further discussions with the Massachusetts Attorney General’s office. On or about February 5, 2016, the parties agreed to a tentative settlement in the amount of $275, subject to final documentation. 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. 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, 2016
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, 2016 and December 31, 2015, the Company had net advances to TerraSea of $24,794 and $27,592, respectively, which are recorded in other current assets. The Company has an accumulated deficit in joint ventures, which represents losses recognized to date in excess of our investment in TerraSea, of $14,359 and $14,271 at March 31, 2016 and December 31, 2015, respectively, which is presented in accrued expenses. The Company has commenced the wind down of TerraSea with its joint venture partner. The Company believes its net advances to TerraSea are ultimately recoverable either through the operations of the joint venture or as an obligation of our joint venture partner. The joint venture partner has notified the Company that it disagrees with the amount of net advances to TerraSea. The Company believes that its joint venture partner remains obligated for its share of net advances, and any future advances necessary to complete TerraSea’s remaining project. During July 2015, the Company proposed taking a larger percent of the loss on a TerraSea project. Based on this proposal, the Company accrued $1,506 at June 30, 2015 representing the estimated share of additional losses to be assumed. The joint venture partner and the Company are continuing discussions. If those discussions do not lead to a resolution satisfactory to both parties, the joint venture partner and the Company will go to binding arbitration as stipulated by the TerraSea operating agreement. To the extent that net advances are not fully recoverable, additional losses may result in future periods. The Company and its joint venture partner remained obligated to fund TerraSea through the completion of its remaining project. The remaining TerraSea project was substantially complete at March 31, 2016.

Business Dispositions

Business Dispositions	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Business Dispositions	10. Business dispositions On April 23, 2014, the Company entered into an agreement and completed the sale of NASDI and Yankee, its two former subsidiaries that comprised our historical demolition business. Under the terms of the agreement, the Company received cash of $5,309 and retained the right to receive additional proceeds based upon future collections of outstanding accounts receivable and work in process existing at the date of close, including recovery of outstanding claims for additional compensation from customers, net of future payments of accounts payable existing at the date of close, including any future payments of obligations associated with outstanding claims. In the fourth quarter of 2013, the Company recorded a preliminary loss on disposal of assets held for sale in discontinued operations. The loss on disposal is subject to change based on the value of additional proceeds received on the working capital existing at the date of disposition. The amount and timing of the working capital settlement and the amount and timing of the realization of additional net proceeds may be impacted by the litigation with the buyer of the historical demolition business. However, management believes that the ultimate resolution of these matters will not be material to the Company’s consolidated financial position or results of operations.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment Information	11. Segment information The Company and its subsidiaries currently operate in two reportable segments: dredging and environmental & infrastructure, previously referred to as the environment & remediation segment. The Company’s financial reporting systems present various data for management to run the business, including profit and loss statements prepared according to the segments presented. Management uses operating income to evaluate performance between the two segments. Segment information for the periods presented is provided as follows: Three Months Ended March 31, 2016 2015 Dredging Contract revenues $ 145,013 $ 154,128 Operating income 10,585 7,874 Environmental & infrastructure Contract revenues $ 19,090 $ 21,552 Operating loss (10,674 ) (15,132 ) Intersegment revenues (984 ) (1,123 ) Total Contract revenues $ 163,119 $ 174,557 Operating loss (89 ) (7,258 ) Foreign dredging revenue of $1,509 for the three months ended March 31, 2016, was attributable to work done in the Middle East. Foreign dredging revenue for the three months ended March 31, 2015 was $41,699. 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, 2016
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Subsidiary Guarantors	12. Subsidiary guarantors The Company’s long-term debt at March 31, 2016 includes $275,000 of 7.375% senior notes due February 1, 2019. The Company’s obligations under these senior unsecured notes are guaranteed by the Company’s 100% owned domestic subsidiaries. Such guarantees are full, unconditional and joint and several. The following supplemental financial information sets forth for the Company’s subsidiary guarantors (on a combined basis), the Company’s non-guarantor subsidiaries (on a combined basis) and Great Lakes Dredge & Dock Corporation, exclusive of its subsidiaries (“GLDD Corporation”): ( i ) balance sheets as of March 31, 2016 and December 31, 2015; (ii) statements of operations and comprehensive income (loss) for the three months ended March 31, 2016 and 2015; and (iii) statements of cash flows for the three months ended March 31, 2016 and 2015. GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF MARCH 31, 2016 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 14,047 $ 1,845 $ 2 $ — $ 15,894 Accounts receivable — net 100,913 87 — — 101,000 Contract revenues in excess of billings 72,729 1,847 — — 74,576 Inventories 35,042 — — — 35,042 Prepaid expenses and other current assets 70,847 307 831 — 71,985 Total current assets 293,578 4,086 833 — 298,497 PROPERTY AND EQUIPMENT—Net 432,740 9 — — 432,749 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 85,774 — — — 85,774 INVENTORIES — Noncurrent 45,170 — — — 45,170 INVESTMENTS IN JOINT VENTURES 3,131 — — — 3,131 RECEIVABLES FROM AFFILIATES 19,086 6,251 73,246 (98,583 ) — INVESTMENTS IN SUBSIDIARIES 3,651 — 622,951 (626,602 ) — OTHER 6,312 1 868 — 7,181 TOTAL $ 889,442 $ 10,347 $ 697,898 $ (725,185 ) $ 872,502 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 96,359 $ 140 $ — $ — $ 96,499 Accrued expenses 56,500 615 4,481 — 61,596 Billings in excess of contract revenues 6,054 104 — — 6,158 Current portion of long term debt 1,433 — 6,097 — 7,530 Total current liabilities 160,346 859 10,578 — 171,783 7 3/8% SENIOR NOTES — — 272,248 — 272,248 REVOLVING CREDIT FACILITY — — 35,000 — 35,000 NOTES PAYABLE 290 — 51,975 — 52,265 DEFERRED INCOME TAXES (783 ) — 72,407 — 71,624 PAYABLES TO AFFILIATES 88,651 4,267 5,665 (98,583 ) — OTHER 19,557 — 136 — 19,693 Total liabilities 268,061 5,126 448,009 (98,583 ) 622,613 TOTAL EQUITY 621,381 5,221 249,889 (626,602 ) 249,889 TOTAL $ 889,442 $ 10,347 $ 697,898 $ (725,185 ) $ 872,502 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF DECEMBER 31, 2015 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 12,035 $ 2,147 $ 2 $ — $ 14,184 Accounts receivable — net 129,978 799 — — 130,777 Contract revenues in excess of billings 79,477 1,718 — — 81,195 Inventories 35,963 — — — 35,963 Prepaid expenses and other current assets 66,919 218 477 — 67,614 Total current assets 324,372 4,882 479 — 329,733 PROPERTY AND EQUIPMENT—Net 430,192 18 — — 430,210 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 86,004 — — — 86,004 INVENTORIES — Noncurrent 41,646 — — — 41,646 INVESTMENTS IN JOINT VENTURES 3,761 — — — 3,761 RECEIVABLES FROM AFFILIATES 18,326 6,009 70,738 (95,073 ) — INVESTMENTS IN SUBSIDIARIES 3,706 — 621,984 (625,690 ) — OTHER 6,702 3 65 — 6,770 TOTAL $ 914,709 $ 10,912 $ 693,266 $ (720,763 ) $ 898,124 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 118,619 $ 227 $ — $ — $ 118,846 Accrued expenses 62,861 509 8,907 — 72,277 Billings in excess of contract revenues 6,964 97 — — 7,061 Current portion of long term debt 1,424 — 6,082 — 7,506 Total current liabilities 189,868 833 14,989 — 205,690 7 3/8% SENIOR NOTES — — 271,998 — 271,998 REVOLVING CREDIT FACILITY — — 20,000 — 20,000 NOTE PAYABLE 323 — 53,469 — 53,792 DEFERRED INCOME TAXES (783 ) — 74,789 — 74,006 PAYABLES TO AFFILIATES 85,859 3,505 5,709 (95,073 ) — OTHER 20,326 — 139 — 20,465 Total liabilities 295,593 4,338 441,093 (95,073 ) 645,951 TOTAL EQUITY 619,116 6,574 252,173 (625,690 ) 252,173 TOTAL $ 914,709 $ 10,912 $ 693,266 $ (720,763 ) $ 898,124 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME FOR THE THREE MONTHS ENDED 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 1,321 (1,410 ) — — (89 ) Interest expense—net (181 ) — (5,540 ) — (5,721 ) Equity in earnings 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 OPERATIONS AND COMPREHENSIVE INCOME FOR THE THREE MONTHS ENDED MARCH 31, 2015 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals Contract revenues $ 172,354 $ 3,192 $ — $ (989 ) $ 174,557 Costs of contract revenues (161,204 ) (3,660 ) — 989 (163,875 ) Gross profit 11,150 (468 ) — — 10,682 OPERATING EXPENSES: General and administrative expenses 17,948 — — — 17,948 (Gain) loss on sale of assets—net (8 ) — — — (8 ) Operating income (loss) (6,790 ) (468 ) — — (7,258 ) Interest expense—net (299 ) — (5,331 ) — (5,630 ) Equity in earnings (loss) of subsidiaries 4 — (9,177 ) 9,173 — Equity in loss of joint ventures (1,098 ) — — — (1,098 ) Gain on bargain purchase acquisition — — — — — Other income (434 ) (7 ) — — (441 ) Income (loss) from continuing operations before income taxes (8,617 ) (475 ) (14,508 ) 9,173 (14,427 ) Income tax (provision) benefit — (81 ) 6,118 — 6,037 Net income (loss) $ (8,617 ) $ (556 ) $ (8,390 ) $ 9,173 $ (8,390 ) Comprehensive income (loss) $ (8,617 ) $ (1,364 ) $ (9,198 ) $ 9,981 $ (9,198 ) 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 ) — Net cash flows provided by (used in) 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 ) Repayments of equipment debt (367 ) — — — (367 ) Net change in accounts with affiliates (629 ) 376 (26,500 ) 26,753 — Intercompany dividends (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 ) Net cash flows 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 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 2015 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals OPERATING ACTIVITIES: Net cash flows provided by (used in) operating activities $ (2,484 ) $ 155 $ (8,248 ) $ — $ (10,577 ) INVESTING ACTIVITIES: Purchases of property and equipment (20,777 ) — — — (20,777 ) Proceeds from dispositions of property and equipment 40 — — — 40 Net change in accounts with affiliates (5,821 ) — — 5,821 — Net cash flows used in investing activities (26,558 ) — — 5,821 (20,737 ) FINANCING ACTIVITIES: Deferred financing fees — — (29 ) — (29 ) Taxes paid on settlement of vested share awards — — (13 ) — (13 ) Repayments of term loan facility — — (1,250 ) — (1,250 ) Repayment of equipment debt (214 ) — — — (214 ) Proceeds from equipment debt — — 408 — 408 Net change in accounts with affiliates — 633 5,188 (5,821 ) — Capital contributions 16,800 — (16,800 ) — — Exercise of options and purchases from employee stock plans — — 736 — 736 Excess income tax benefit from share-based compensation — — 8 — 8 Borrowings under revolving loans — — 53,000 — 53,000 Repayments of revolving loans — — (33,000 ) — (33,000 ) Net cash flows provided by financing activities 16,586 633 8,248 (5,821 ) 19,646 Effect of foreign currency exchange rates on cash and cash equivalents — (102 ) — — (102 ) Net increase (decrease) in cash and cash equivalents (12,456 ) 686 — — (11,770 ) Cash and cash equivalents at beginning of period 41,724 663 2 — 42,389 Cash and cash equivalents at end of period $ 29,268 $ 1,349 $ 2 $ — $ 30,619

Basis Of Presentation Policies

Basis Of Presentation Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-09, Compensation – Stock Compensation (Topic 718) In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) In November 2015, the FASB issued Accounting Standard Update No. 2015-17 (“ASU 2015-17”), Income Taxes: Balance Sheet Classifications of Deferred Taxes (Topic 740) In April 2015, the FASB issued Accounting Standard Update No. 2015-03 (“ASU 2015-03”), Interest - Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs In May 2014, the FASB issued Accounting Standard Update No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers (Topic 606)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Computations For Basic And Diluted Earnings Per Share	The computations for basic and diluted loss per share are as follows: Three Months Ended (shares in thousands) March 31, 2016 2015 Net loss $ (4,035 ) $ (8,390 ) Weighted-average common shares outstanding — basic and diluted 60,507 60,265 Loss per share — $ (0.07 ) $ (0.14 ) Loss per share — diluted $ (0.07 ) $ (0.14 )

Accounts Receivable And Contr23

Accounts Receivable And Contracts In Progress (Tables)	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Schedule Of Accounts Receivable	Accounts receivable at March 31, 2016 and December 31, 2015 are as follows: March 31, December 31, 2016 2015 Completed contracts $ 37,324 $ 37,111 Contracts in progress 50,669 70,787 Retainage 17,088 27,203 105,081 135,101 Allowance for doubtful accounts (439 ) (754 ) Total accounts receivable—net $ 104,642 $ 134,347 Current portion of accounts receivable—net $ 101,000 $ 130,777 Long-term accounts receivable and retainage 3,642 3,570 Total accounts receivable—net $ 104,642 $ 134,347
Components Of Contracts In Progress	The components of contracts in progress at March 31, 2016 and December 31, 2015 are as follows: March 31, December 31, 2016 2015 Costs and earnings in excess of billings: Costs and earnings for contracts in progress $ 375,747 $ 230,159 Amounts billed (332,037 ) (176,283 ) Costs and earnings in excess of billings for contracts in progress 43,710 53,876 Costs and earnings in excess of billings for completed contracts 30,866 27,319 Total contract revenues in excess of billings $ 74,576 $ 81,195 Billings in excess of costs and earnings: Amounts billed $ (176,226 ) $ (207,550 ) Costs and earnings for contracts in progress 170,068 200,489 Total billings in excess of contract revenues $ (6,158 ) $ (7,061 )

Accrued Expenses (Tables)

Accrued Expenses (Tables)	3 Months Ended
	Mar. 31, 2016
Payables And Accruals [Abstract]
Accrued Expenses	Accrued expenses at March 31, 2016 and December 31, 2015 are as follows: March 31, December 31, 2016 2015 Insurance $ 16,728 $ 16,291 Accumulated deficit in joint ventures 14,359 15,408 Payroll and employee benefits 10,345 13,317 Interest 4,008 8,743 Percentage of completion adjustment 3,197 2,837 Fuel hedge contracts 3,056 4,388 Income and other taxes 1,845 3,726 Other 8,058 7,567 Total accrued expenses $ 61,596 $ 72,277

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date	The fair values of these financial instruments are summarized as follows: Fair Value Measurements at Reporting Date Using Description At March 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 $ 3,056 $ — $ 3,056 $ — Fair Value Measurements at Reporting Date Using Description At December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fuel hedge contracts $ 4,388 $ — $ 4,388 $ —
Schedule Fair Value Measurements Balance Sheet Location	The fair value of the fuel hedge contracts outstanding as of March 31, 2016 and December 31, 2015 is as follows: Fair Value at March 31, December 31, Balance Sheet Location 2016 2015 Liability derivatives: Derivatives not designated as hedging instruments Fuel hedge contracts Accrued expenses $ 3,056 $ 4,388
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, 2016 2015 Cumulative translation adjustments—net of tax $ 409 $ (808 )

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment Reporting By Segment	Three Months Ended March 31, 2016 2015 Dredging Contract revenues $ 145,013 $ 154,128 Operating income 10,585 7,874 Environmental & infrastructure Contract revenues $ 19,090 $ 21,552 Operating loss (10,674 ) (15,132 ) Intersegment revenues (984 ) (1,123 ) Total Contract revenues $ 163,119 $ 174,557 Operating loss (89 ) (7,258 )

Subsidiary Guarantors (Tables)

Subsidiary Guarantors (Tables)	3 Months Ended
	Mar. 31, 2016
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Consolidating of Balance Sheet	GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF MARCH 31, 2016 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 14,047 $ 1,845 $ 2 $ — $ 15,894 Accounts receivable — net 100,913 87 — — 101,000 Contract revenues in excess of billings 72,729 1,847 — — 74,576 Inventories 35,042 — — — 35,042 Prepaid expenses and other current assets 70,847 307 831 — 71,985 Total current assets 293,578 4,086 833 — 298,497 PROPERTY AND EQUIPMENT—Net 432,740 9 — — 432,749 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 85,774 — — — 85,774 INVENTORIES — Noncurrent 45,170 — — — 45,170 INVESTMENTS IN JOINT VENTURES 3,131 — — — 3,131 RECEIVABLES FROM AFFILIATES 19,086 6,251 73,246 (98,583 ) — INVESTMENTS IN SUBSIDIARIES 3,651 — 622,951 (626,602 ) — OTHER 6,312 1 868 — 7,181 TOTAL $ 889,442 $ 10,347 $ 697,898 $ (725,185 ) $ 872,502 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 96,359 $ 140 $ — $ — $ 96,499 Accrued expenses 56,500 615 4,481 — 61,596 Billings in excess of contract revenues 6,054 104 — — 6,158 Current portion of long term debt 1,433 — 6,097 — 7,530 Total current liabilities 160,346 859 10,578 — 171,783 7 3/8% SENIOR NOTES — — 272,248 — 272,248 REVOLVING CREDIT FACILITY — — 35,000 — 35,000 NOTES PAYABLE 290 — 51,975 — 52,265 DEFERRED INCOME TAXES (783 ) — 72,407 — 71,624 PAYABLES TO AFFILIATES 88,651 4,267 5,665 (98,583 ) — OTHER 19,557 — 136 — 19,693 Total liabilities 268,061 5,126 448,009 (98,583 ) 622,613 TOTAL EQUITY 621,381 5,221 249,889 (626,602 ) 249,889 TOTAL $ 889,442 $ 10,347 $ 697,898 $ (725,185 ) $ 872,502 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEET AS OF DECEMBER 31, 2015 (In thousands) ASSETS Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals CURRENT ASSETS: Cash and cash equivalents $ 12,035 $ 2,147 $ 2 $ — $ 14,184 Accounts receivable — net 129,978 799 — — 130,777 Contract revenues in excess of billings 79,477 1,718 — — 81,195 Inventories 35,963 — — — 35,963 Prepaid expenses and other current assets 66,919 218 477 — 67,614 Total current assets 324,372 4,882 479 — 329,733 PROPERTY AND EQUIPMENT—Net 430,192 18 — — 430,210 GOODWILL AND OTHER INTANGIBLE ASSETS—Net 86,004 — — — 86,004 INVENTORIES — Noncurrent 41,646 — — — 41,646 INVESTMENTS IN JOINT VENTURES 3,761 — — — 3,761 RECEIVABLES FROM AFFILIATES 18,326 6,009 70,738 (95,073 ) — INVESTMENTS IN SUBSIDIARIES 3,706 — 621,984 (625,690 ) — OTHER 6,702 3 65 — 6,770 TOTAL $ 914,709 $ 10,912 $ 693,266 $ (720,763 ) $ 898,124 LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable $ 118,619 $ 227 $ — $ — $ 118,846 Accrued expenses 62,861 509 8,907 — 72,277 Billings in excess of contract revenues 6,964 97 — — 7,061 Current portion of long term debt 1,424 — 6,082 — 7,506 Total current liabilities 189,868 833 14,989 — 205,690 7 3/8% SENIOR NOTES — — 271,998 — 271,998 REVOLVING CREDIT FACILITY — — 20,000 — 20,000 NOTE PAYABLE 323 — 53,469 — 53,792 DEFERRED INCOME TAXES (783 ) — 74,789 — 74,006 PAYABLES TO AFFILIATES 85,859 3,505 5,709 (95,073 ) — OTHER 20,326 — 139 — 20,465 Total liabilities 295,593 4,338 441,093 (95,073 ) 645,951 TOTAL EQUITY 619,116 6,574 252,173 (625,690 ) 252,173 TOTAL $ 914,709 $ 10,912 $ 693,266 $ (720,763 ) $ 898,124
Schedule Of Condensed Consolidating Operations And Comprehensive Income	GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME FOR THE 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 1,321 (1,410 ) — — (89 ) Interest expense—net (181 ) — (5,540 ) — (5,721 ) Equity in earnings 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 OPERATIONS AND COMPREHENSIVE INCOME FOR THE THREE MONTHS ENDED MARCH 31, 2015 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals Contract revenues $ 172,354 $ 3,192 $ — $ (989 ) $ 174,557 Costs of contract revenues (161,204 ) (3,660 ) — 989 (163,875 ) Gross profit 11,150 (468 ) — — 10,682 OPERATING EXPENSES: General and administrative expenses 17,948 — — — 17,948 (Gain) loss on sale of assets—net (8 ) — — — (8 ) Operating income (loss) (6,790 ) (468 ) — — (7,258 ) Interest expense—net (299 ) — (5,331 ) — (5,630 ) Equity in earnings (loss) of subsidiaries 4 — (9,177 ) 9,173 — Equity in loss of joint ventures (1,098 ) — — — (1,098 ) Gain on bargain purchase acquisition — — — — — Other income (434 ) (7 ) — — (441 ) Income (loss) from continuing operations before income taxes (8,617 ) (475 ) (14,508 ) 9,173 (14,427 ) Income tax (provision) benefit — (81 ) 6,118 — 6,037 Net income (loss) $ (8,617 ) $ (556 ) $ (8,390 ) $ 9,173 $ (8,390 ) Comprehensive income (loss) $ (8,617 ) $ (1,364 ) $ (9,198 ) $ 9,981 $ (9,198 )
Condensed Cash Flow Statement	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 ) — Net cash flows provided by (used in) 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 ) Repayments of equipment debt (367 ) — — — (367 ) Net change in accounts with affiliates (629 ) 376 (26,500 ) 26,753 — Intercompany dividends (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 ) Net cash flows 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 GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 2015 (In thousands) Subsidiary Guarantors Non-Guarantor Subsidiaries GLDD Corporation Eliminations Consolidated Totals OPERATING ACTIVITIES: Net cash flows provided by (used in) operating activities $ (2,484 ) $ 155 $ (8,248 ) $ — $ (10,577 ) INVESTING ACTIVITIES: Purchases of property and equipment (20,777 ) — — — (20,777 ) Proceeds from dispositions of property and equipment 40 — — — 40 Net change in accounts with affiliates (5,821 ) — — 5,821 — Net cash flows used in investing activities (26,558 ) — — 5,821 (20,737 ) FINANCING ACTIVITIES: Deferred financing fees — — (29 ) — (29 ) Taxes paid on settlement of vested share awards — — (13 ) — (13 ) Repayments of term loan facility — — (1,250 ) — (1,250 ) Repayment of equipment debt (214 ) — — — (214 ) Proceeds from equipment debt — — 408 — 408 Net change in accounts with affiliates — 633 5,188 (5,821 ) — Capital contributions 16,800 — (16,800 ) — — Exercise of options and purchases from employee stock plans — — 736 — 736 Excess income tax benefit from share-based compensation — — 8 — 8 Borrowings under revolving loans — — 53,000 — 53,000 Repayments of revolving loans — — (33,000 ) — (33,000 ) Net cash flows provided by financing activities 16,586 633 8,248 (5,821 ) 19,646 Effect of foreign currency exchange rates on cash and cash equivalents — (102 ) — — (102 ) Net increase (decrease) in cash and cash equivalents (12,456 ) 686 — — (11,770 ) Cash and cash equivalents at beginning of period 41,724 663 2 — 42,389 Cash and cash equivalents at end of period $ 29,268 $ 1,349 $ 2 $ — $ 30,619

Basis Of Presentation (Narrativ

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

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	1,812
Securities excluded from computation of earnings per share amount due to loss	359	534

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net loss	$ (4,035)	$ (8,390)
Weighted-average common shares outstanding - basic and diluted	60,507	60,265
Loss per share — basic	$ (0.07)	$ (0.14)
Loss per share — diluted	$ (0.07)	$ (0.14)

Accounts Receivable And Contr31

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Retainage	$ 17,088	$ 27,203
Accounts receivable, gross	105,081	135,101
Allowance for doubtful accounts	(439)	(754)
Total accounts receivable—net	104,642	134,347
Current portion of accounts receivable—net	101,000	130,777
Long-term accounts receivable and retainage	3,642	3,570
Completed Contracts [Member]
Accounts Notes And Loans Receivable [Line Items]
contracts	37,324	37,111
Contracts In Progress [Member]
Accounts Notes And Loans Receivable [Line Items]
contracts	$ 50,669	$ 70,787

Accounts Receivable And Contr32

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 43,710	$ 53,876
Costs and earnings in excess of billings for completed contracts	30,866	27,319
Total contract revenues in excess of billings	74,576	81,195
Total billings in excess of contract revenues	(6,158)	(7,061)
Costs And Earnings In Excess Of Billings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	375,747	230,159
Amounts billed	(332,037)	(176,283)
Billings In Excess Of Costs And Earnings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	170,068	200,489
Amounts billed	$ (176,226)	$ (207,550)

Accounts Receivable And Contr33

Accounts Receivable And Contracts In Progress (Narrative) (Details) $ in Thousands	Mar. 31, 2016USD ($)
Receivables [Abstract]
Costs in excess of billings	$ 17,910

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Insurance	$ 16,728	$ 16,291
Accumulated deficit in joint ventures	14,359	15,408
Payroll and employee benefits	10,345	13,317
Interest	4,008	8,743
Percentage of completion adjustment	3,197	2,837
Fuel hedge contracts	3,056	4,388
Income and other taxes	1,845	3,726
Other	8,058	7,567
Total accrued expenses	$ 61,596	$ 72,277

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Nov. 04, 2014	Jun. 04, 2012
Debt Instrument [Line Items]
Net book value of related assets	$ 148,785,000
Net Leverage Ratio	4.50%
Fixed Charge Coverage Ratio	1.25%
Revolving credit facility	$ 35,000,000		$ 20,000,000
Letters of credit outstanding	49,360,000
Letter of credit remaining borrowing capacity	125,640,000
Borrowed aggregate principal amount			2,640,000	$ 47,360,000
Purchases of property and equipment	14,917,000	$ 20,777,000
Long-term Debt, Current Maturities	7,530,000		$ 7,506,000
7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 275,000,000
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Maturity date	Feb. 1, 2019
If Redeemed In 2015 [Member] | 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	103.70%
If Redeemed In 2016 [Member] | 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	101.80%
If Redeemed After 2016 [Member] | 7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Net book value of related assets	$ 49,227,000
Debt instrument, face amount					$ 50,000,000
Debt Instrument, Term	5 years
Term Loan Facility Bear Interest Fixed Rate	4.655%
Debt Instrument, Interest Rate, Increase (Decrease)	2.00%
Percentage of principal to be repaid yearly during first two years of term	10.00%
Percentage of principal to be repaid yearly during third and fourth years of term	20.00%
Percentage of principal to be repaid during fifth year of term	25.00%
Vessels and Ancillary Equipment [Member]
Debt Instrument [Line Items]
Purchases of property and equipment		15,569,000
Operating leases expiration year	2,023
Long-term Debt, Current Maturities		2,396,000
Long-term Debt, Excluding Current Maturities		$ 16,488,000
Vessels and Ancillary Equipment [Member] | 5.75% Senior Notes Due In 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.75%
Maximum [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Minimum [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 210,000,000
Line of credit facility optional increase capacity						15,000,000
Revolving credit facility, interest rate description	The Credit Agreement is collateralized by a substantial portion of the Company’s operating equipment with a net book value at March 31, 2016 of $148,785. Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the revolving credit facility will bear interest at the option of the Company at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum.
Multicurrency [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						50,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 10,000,000

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Measurements At Reporting Date Using) (Details) - Fuel Hedge Contracts [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 3,056	$ 4,388
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 3,056	$ 4,388

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) gal in Millions	3 Months Ended
	Mar. 31, 2016USD ($)$ / galgal	Dec. 31, 2015USD ($)
Derivatives Fair Value [Line Items]
Derivative underlying hedge percent	80.00%
Derivative, Nonmonetary Notional Amount, Volume | gal	12
Fair value hedge liabilities	$ 3,056,000	$ 4,388,000
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	$ 260,563,000
Minimum [Member]
Derivatives Fair Value [Line Items]
Fixed price range | $ / gal	1.02
Maximum [Member]
Derivatives Fair Value [Line Items]
Fixed price range | $ / gal	2.11

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Balance Sheet Location Fuel Hedge Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Fair value hedge liabilities	$ 3,056	$ 4,388
Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] | Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Fair value hedge liabilities	$ 3,056	$ 4,388

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, 2016	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Cumulative translation adjustments—net of tax	$ 409	$ (808)

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units	661
Share-based compensation expense		$ 927	$ 1,057
Employees And Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant	5,800	5,800

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details) - USD ($)	Feb. 05, 2016	Jan. 14, 2015	Mar. 31, 2016
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 1,093,262,000
Revenue value remaining from outstanding performance bonds			579,451,000
Tentative settlement subject to final documentation	$ 275,000
Proceeds from Legal Settlements		$ 5,309,000
Discontinued Operations [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds			41,082,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 1,000,000
Warranty periods			1 year
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 10,000,000
Warranty periods			3 years

Investments (Details)

Investments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Mar. 31, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
Accumulated deficit in joint ventures		$ 14,359	$ 15,408
TerraSea Environmental Solutions [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage		50.00%
Other current assets		$ 24,794	27,592
Accumulated deficit in joint ventures		$ 14,359	$ 14,271
Provision for losses to be assumed	$ 1,506

Business Dispositions (Narrativ

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

Segment Information (Narrative)

Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)segment	Mar. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Contract revenues	$ 163,119	$ 174,557
Dredging Segment [Member] | Foreign [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 1,509	$ 41,699

Segment Information (Segment Re

Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Contract revenues	$ 163,119	$ 174,557
Operating income (loss)	(89)	(7,258)
Dredging Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	10,585	7,874
Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(10,674)	(15,132)
Operating Segment [Member] | Dredging Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	145,013	154,128
Operating Segment [Member] | Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	19,090	21,552
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ (984)	$ (1,123)

Subsidiary Guarantors (Narrativ

Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
7 3/8% SENIOR NOTES	$ 272,248	$ 271,998
Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
7 3/8% SENIOR NOTES	$ 275,000
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Owned Domestic Subsidiaries Percent	100.00%

Subsidiary Guarantors (Condense

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 15,894	$ 14,184	$ 30,619	$ 42,389
Accounts receivable—net	101,000	130,777
Contract revenues in excess of billings	74,576	81,195
Inventories	35,042	35,963
Prepaid expenses and other current assets	71,985	67,614
Total current assets	298,497	329,733
PROPERTY AND EQUIPMENT—Net	432,749	430,210
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	85,774	86,004
INVENTORIES—Noncurrent	45,170	41,646
INVESTMENTS IN JOINT VENTURES	3,131	3,761
OTHER	7,181	6,770
TOTAL	872,502	898,124
LIABILITIES AND EQUITY
Accounts payable	96,499	118,846
Accrued expenses	61,596	72,277
Billings in excess of contract revenues	6,158	7,061
Current portion of long term debt	7,530	7,506
Total current liabilities	171,783	205,690
7 3/8% SENIOR NOTES	272,248	271,998
REVOLVING CREDIT FACILITY	35,000	20,000
NOTES PAYABLE	52,265	53,792
DEFERRED INCOME TAXES	71,624	74,006
OTHER	19,693	20,465
Total liabilities	622,613	645,951
TOTAL EQUITY	249,889	252,173	248,553	255,963
TOTAL	872,502	898,124
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	14,047	12,035
Accounts receivable—net	100,913	129,978
Contract revenues in excess of billings	72,729	79,477
Inventories	35,042	35,963
Prepaid expenses and other current assets	70,847	66,919
Total current assets	293,578	324,372
PROPERTY AND EQUIPMENT—Net	432,740	430,192
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	85,774	86,004
INVENTORIES—Noncurrent	45,170	41,646
INVESTMENTS IN JOINT VENTURES	3,131	3,761
RECEIVABLES FROM AFFILIATES	19,086	18,326
INVESTMENTS IN SUBSIDIARIES	3,651	3,706
OTHER	6,312	6,702
TOTAL	889,442	914,709
LIABILITIES AND EQUITY
Accounts payable	96,359	118,619
Accrued expenses	56,500	62,861
Billings in excess of contract revenues	6,054	6,964
Current portion of long term debt	1,433	1,424
Total current liabilities	160,346	189,868
NOTES PAYABLE	290	323
Deferred Tax Assets	(783)	(783)
PAYABLES TO AFFILIATES	88,651	85,859
OTHER	19,557	20,326
Total liabilities	268,061	295,593
TOTAL EQUITY	621,381	619,116
TOTAL	889,442	914,709
Non Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	1,845	2,147
Accounts receivable—net	87	799
Contract revenues in excess of billings	1,847	1,718
Prepaid expenses and other current assets	307	218
Total current assets	4,086	4,882
PROPERTY AND EQUIPMENT—Net	9	18
RECEIVABLES FROM AFFILIATES	6,251	6,009
OTHER	1	3
TOTAL	10,347	10,912
LIABILITIES AND EQUITY
Accounts payable	140	227
Accrued expenses	615	509
Billings in excess of contract revenues	104	97
Total current liabilities	859	833
PAYABLES TO AFFILIATES	4,267	3,505
Total liabilities	5,126	4,338
TOTAL EQUITY	5,221	6,574
TOTAL	10,347	10,912
GLDD Corporation [Member]
ASSETS
Cash and cash equivalents	2	2	$ 2	$ 2
Prepaid expenses and other current assets	831	477
Total current assets	833	479
RECEIVABLES FROM AFFILIATES	73,246	70,738
INVESTMENTS IN SUBSIDIARIES	622,951	621,984
OTHER	868	65
TOTAL	697,898	693,266
LIABILITIES AND EQUITY
Accrued expenses	4,481	8,907
Current portion of long term debt	6,097	6,082
Total current liabilities	10,578	14,989
7 3/8% SENIOR NOTES	272,248	271,998
REVOLVING CREDIT FACILITY	35,000	20,000
NOTES PAYABLE	51,975	53,469
DEFERRED INCOME TAXES	72,407	74,789
PAYABLES TO AFFILIATES	5,665	5,709
OTHER	136	139
Total liabilities	448,009	441,093
TOTAL EQUITY	249,889	252,173
TOTAL	697,898	693,266
Consolidation Eliminations [Member]
ASSETS
RECEIVABLES FROM AFFILIATES	(98,583)	(95,073)
INVESTMENTS IN SUBSIDIARIES	(626,602)	(625,690)
TOTAL	(725,185)	(720,763)
LIABILITIES AND EQUITY
PAYABLES TO AFFILIATES	(98,583)	(95,073)
Total liabilities	(98,583)	(95,073)
TOTAL EQUITY	(626,602)	(625,690)
TOTAL	$ (725,185)	$ (720,763)

Subsidiary Guarantors (Conden48

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 163,119	$ 174,557
Costs of contract revenues	(143,129)	(163,875)
Gross profit	19,990	10,682
General and administrative expenses	20,089	17,948
(Gain) loss on sale of assets—net	(10)	(8)
Operating loss	(89)	(7,258)
Interest expense—net	(5,721)	(5,630)
Equity in loss of joint ventures	(115)	(1,098)
Other income (expense)	(763)	(441)
Loss before income taxes	(6,688)	(14,427)
Income tax benefit	2,653	6,037
Net loss	(4,035)	(8,390)
Comprehensive income (loss)	(3,626)	(9,198)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	163,579	172,354
Costs of contract revenues	(142,183)	(161,204)
Gross profit	21,396	11,150
General and administrative expenses	20,085	17,948
(Gain) loss on sale of assets—net	(10)	(8)
Operating loss	1,321	(6,790)
Interest expense—net	(181)	(299)
Equity in earnings (loss) of subsidiaries	(82)	4
Equity in loss of joint ventures	(115)	(1,098)
Other income (expense)	(755)	(434)
Loss before income taxes	188	(8,617)
Income tax benefit	(1)
Net loss	187	(8,617)
Comprehensive income (loss)	187	(8,617)
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues		3,192
Costs of contract revenues	(1,406)	(3,660)
Gross profit	(1,406)	(468)
General and administrative expenses	4
Operating loss	(1,410)	(468)
Other income (expense)	(8)	(7)
Loss before income taxes	(1,418)	(475)
Income tax benefit		(81)
Net loss	(1,418)	(556)
Comprehensive income (loss)	(1,009)	(1,364)
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(460)	(989)
Costs of contract revenues	460	989
Equity in earnings (loss) of subsidiaries	1,231	9,173
Loss before income taxes	1,231	9,173
Net loss	1,231	9,173
Comprehensive income (loss)	822	9,981
GLDD Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Interest expense—net	(5,540)	(5,331)
Equity in earnings (loss) of subsidiaries	(1,149)	(9,177)
Loss before income taxes	(6,689)	(14,508)
Income tax benefit	2,654	6,118
Net loss	(4,035)	(8,390)
Comprehensive income (loss)	$ (3,626)	$ (9,198)

Subsidiary Guarantors (Conden49

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$ 2,960	$ (10,577)
INVESTING ACTIVITIES:
Purchases of property and equipment	(14,917)	(20,777)
Proceeds from dispositions of property and equipment	25	40
Net cash flows used in investing activities	(14,892)	(20,737)
FINANCING ACTIVITIES:
Repayments of long term note payable	(265)
Repayments of term loan facility	(1,250)	(1,250)
Repayments of equipment debt	(367)	(214)
Exercise of options and purchases from employee stock plans	415	736
Borrowings under revolving loans	38,000	53,000
Repayments of revolving loans	(23,000)	(33,000)
Net cash provided by financing activities	13,533	19,646
Effect of foreign currency exchange rates on cash and cash equivalents	109	(102)
Net increase (decrease) in cash and cash equivalents	1,710	(11,770)
Cash and cash equivalents at beginning of period	14,184	42,389
Cash and cash equivalents at end of period	15,894	30,619
Deferred financing fees		(29)
Taxes paid on settlement of vested share awards		(13)
Proceeds from equipment debt		408
Excess income tax benefit from share-based compensation		8
Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	14,147	(2,484)
INVESTING ACTIVITIES:
Purchases of property and equipment	(14,917)	(20,777)
Proceeds from dispositions of property and equipment	25	40
Net change in accounts with affiliates	26,753	(5,821)
Net cash flows used in investing activities	11,861	(26,558)
FINANCING ACTIVITIES:
Repayments of equipment debt	(367)	(214)
Net change in accounts with affiliates	(629)
Capital contributions		16,800
Intercompany dividends	(23,000)
Net cash provided by financing activities	(23,996)	16,586
Net increase (decrease) in cash and cash equivalents	2,012	(12,456)
Cash and cash equivalents at beginning of period	12,035	41,724
Cash and cash equivalents at end of period	14,047	29,268
Non Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	(787)	155
FINANCING ACTIVITIES:
Net change in accounts with affiliates	376	633
Net cash provided by financing activities	376	633
Effect of foreign currency exchange rates on cash and cash equivalents	109	(102)
Net increase (decrease) in cash and cash equivalents	(302)	686
Cash and cash equivalents at beginning of period	2,147	663
Cash and cash equivalents at end of period	1,845	1,349
Consolidation Eliminations [Member]
INVESTING ACTIVITIES:
Net change in accounts with affiliates	(26,753)	5,821
Net cash flows used in investing activities	(26,753)	5,821
FINANCING ACTIVITIES:
Net change in accounts with affiliates	26,753	(5,821)
Net cash provided by financing activities	26,753	(5,821)
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	(10,400)	(8,248)
FINANCING ACTIVITIES:
Repayments of long term note payable	(265)
Repayments of term loan facility	(1,250)	(1,250)
Net change in accounts with affiliates	(26,500)	5,188
Capital contributions		(16,800)
Intercompany dividends	23,000
Exercise of options and purchases from employee stock plans	415	736
Borrowings under revolving loans	38,000	53,000
Repayments of revolving loans	(23,000)	(33,000)
Net cash provided by financing activities	10,400	8,248
Cash and cash equivalents at beginning of period	2	2
Cash and cash equivalents at end of period	$ 2	2
Deferred financing fees		(29)
Taxes paid on settlement of vested share awards		(13)
Proceeds from equipment debt		408
Excess income tax benefit from share-based compensation		$ 8