10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the quarterly period ended September 30, 2012

OR

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

For the transition period from                     to                    

Commission file number: 001-33225

Great Lakes Dredge & Dock Corporation

(Exact name of registrant as specified in its charter)

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

(630) 574-3000

(Registrant’s telephone number, including area code)

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

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

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

Large Accelerated Filer	¨	Accelerated Filer	x
Non-Accelerated Filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

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

As of November 2, 2012, 59,279,750 shares of the Registrant’s Common Stock, par value $.0001 per share, were outstanding.

Great Lakes Dredge & Dock Corporation and Subsidiaries

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

Securities Exchange Act of 1934

For the Quarterly Period ended September 30, 2012

INDEX

		Page
Part I Financial Information (Unaudited)			3
Item 1	Financial Statements		3
	Condensed Consolidated Balance Sheets at September 30, 2012 and December 31, 2011		3
	Condensed Consolidated Statements of Operations for the Three and Nine Months ended September 30, 2012 and 2011		4
	Condensed Consolidated Statements of Comprehensive Income for the Three and Nine Months ended September 30, 2012 and 2011		5
	Condensed Consolidated Statements of Equity for the Nine Months ended September 30, 2012 and 2011		6
	Condensed Consolidated Statements of Cash Flows for the Nine Months ended September 30, 2012 and 2011		7
	Notes to Condensed Consolidated Financial Statements		8
Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations		25
Item 3	Quantitative and Qualitative Disclosures About Market Risk		33
Item 4	Controls and Procedures		34
Part II Other Information			35
Item 1	Legal Proceedings		35
Item 1A	Risk Factors		35
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds		35
Item 3	Defaults Upon Senior Securities		35
Item 4	Mine Safety Disclosures		35
Item 5	Other Information		35
Item 6	Exhibits		36
Signature			37
Exhibit Index			38

2

PART I — Financial Information

Item 1. Financial Statements.

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

Condensed Consolidated Balance Sheets

(Unaudited)

(in thousands, except share and per share amounts)

	September 30,			December 31,
	2012			2011
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	38,324		$	113,288
Accounts receivable—net		134,244			120,268
Contract revenues in excess of billings		62,146			26,412
Inventories		36,511			33,426
Prepaid expenses and other current assets		50,999			32,384
Total current assets		322,224			325,778
PROPERTY AND EQUIPMENT—Net		313,383			310,520
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,666			98,863
INVENTORIES—Noncurrent		37,354			30,103
INVESTMENTS IN JOINT VENTURES		7,076			6,923
OTHER		17,983			16,273
TOTAL	$	796,686		$	788,460
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	92,019		$	82,745
Accrued expenses		23,905			31,121
Billings in excess of contract revenues		20,817			13,627
Current portion of long term debt		2,587			3,033
Total current liabilities		139,328			130,526
LONG TERM NOTE PAYABLE		2,500			2,500
7 3/8% SENIOR NOTES		250,000			250,000
DEFERRED INCOME TAXES		104,349			104,352
OTHER		6,757			8,545
Total liabilities		502,934			495,923
COMMITMENTS AND CONTINGENCIES (Note 9)
EQUITY:
Common stock—$.0001 par value; 90,000,000 authorized, 59,274,393 and 58,999,404 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively.		6			6
Additional paid-in capital		270,434			267,918
Retained earnings		23,650			24,042
Accumulated other comprehensive income (loss)		(547	)		3
Total Great Lakes Dredge & Dock Corporation equity		293,543			291,969
NONCONTROLLING INTERESTS		209			568
Total equity		293,752			292,537
TOTAL	$	796,686		$	788,460

See notes to unaudited condensed consolidated financial statements.

3

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Operations

(Unaudited)

(in thousands, except per share amounts)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Contract revenues	$	166,763		$	158,468		$	488,202		$	468,765
Costs of contract revenues		153,743			131,077			431,271			394,166
Gross profit		13,020			27,391			56,931			74,599
General and administrative expenses		11,667			12,736			36,390			38,447
Gain on sale of assets—net		(108	)		(131	)		(232	)		(2,902	)
Operating income		1,461			14,786			20,773			39,054
Interest expense—net		(5,105	)		(5,571	)		(15,747	)		(16,432	)
Equity in earnings (loss) of joint ventures		177			606			153			(108	)
Loss on foreign currency transactions—net		(40	)		(544	)		(55	)		(544	)
Loss on extinguishment of debt		—			—			—			(5,145	)
Income (loss) before income taxes		(3,507	)		9,277			5,124			16,825
Income tax (provision) benefit		1,355			(3,618	)		(1,977	)		(6,600	)
Net income (loss)		(2,152	)		5,659			3,147			10,225
Net (income) loss attributable to noncontrolling interests		20			(57	)		226			(525	)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	(2,132	)	$	5,602		$	3,373		$	9,700
Basic earnings (loss) per share attributable to Great Lakes Dredge & Dock Corporation	$	(0.04	)	$	0.10		$	0.06		$	0.16
Basic weighted average shares		59,253			58,930			59,154			58,863
Diluted earnings (loss) per share attributable to Great Lakes Dredge & Dock Corporation	$	(0.04	)	$	0.09		$	0.06		$	0.16
Diluted weighted average shares		59,253			59,161			59,567			59,533
Dividends declared per share	$	0.02		$	0.02		$	0.06		$	0.06

See notes to unaudited condensed consolidated financial statements.

4

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Comprehensive Income

(Unaudited)

(in thousands)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Net income (loss)	$	(2,152	)	$	5,659		$	3,147		$	10,225
Currency translation adjustment—net of tax (1)		—			(374	)		(4	)		(374	)
Reclassification of derivative losses to earnings—net of tax (2)		(85	)		(183	)		(348	)		(1,250	)
Change in fair value of derivatives—net of tax (3)		827			(347	)		(198	)		472
Other comprehensive income (loss)—net of tax		742			(904	)		(550	)		(1,152	)
Comprehensive income (loss)		(1,410	)		4,755			2,597			9,073
Comprehensive (income) loss attributable to noncontrolling interests		20			(57	)		226			(525	)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	(1,390	)	$	4,698		$	2,823		$	8,548

(1) Net of income tax (expense) benefit of $0 and $0 for the three months ended September 30, 2012 and 2011, respectively, and $(3) and $0 for nine months ended September 30, 2012 and 2011, respectively.

(2) Net of income tax expense of $56 and $295 for the three months ended September 30, 2012 and 2011, respectively, and $231 and $830 for the nine months ended September 30, 2012 and 2011, respectively.

(3) Net of income tax (expense) benefit of $549 and $(246) for the three months ended September 30, 2012 and 2011, respectively, and $(132) and $(313) for the nine months ended September 30, 2012 and 2011, respectively.

See notes to unaudited condensed consolidated financial statements.

5

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Equity

(Unaudited)

(in thousands, except share amounts)

	Great Lakes Dredge & Dock Corporation shareholders
											Accumulated
	Shares of				Additional						Other
	Common		Common		Paid-In			Retained			Comprehensive			Noncontrolling
	Stock		Stock		Capital			Earnings			Income (Loss)			Interests			Total
BALANCE—January 1, 2012		58,999,404	$	6	$	267,918		$	24,042		$	3		$	568		$	292,537
Share-based compensation		145,349		—		2,389			—			—			—			2,389
Vesting of restricted stock units, including impact of shares withheld for taxes		81,640		—		(212	)		—			—			—			(212	)
Exercise of stock options		48,000		—		200			—			—			—			200
Excess income tax benefit from share-based compensation		—		—		139			—			—			—			139
Dividends declared and paid		—		—		—			(3,726	)		—			—			(3,726	)
Dividend equivalents paid on restricted stock units		—		—		—			(39	)		—			—			(39	)
Distributions paid to noncontrolling interests		—		—		—			—			—			(133	)		(133	)
Net income		—		—		—			3,373			—			(226	)		3,147
Other comprehensive loss—net of tax		—		—		—			—			(550	)		—			(550	)
BALANCE—September 30, 2012		59,274,393	$	6	$	270,434		$	23,650		$	(547	)	$	209		$	293,752
	Great Lakes Dredge & Dock Corporation shareholders
											Accumulated
	Shares of				Additional						Other
	Common		Common		Paid-In			Retained			Comprehensive			Noncontrolling
	Stock		Stock		Capital			Earnings			Income (Loss)			Interests			Total
BALANCE—January 1, 2011		58,770,369	$	6	$	266,329		$	12,261		$	357		$	(2,128	)	$	276,825
Share-based compensation		77,369		—		1,224			—			—			—			1,224
Vesting of restricted stock units, including impact of shares withheld for taxes		106,428		—		(291	)		—			—			—			(291	)
Exercise of stock options		6,278		—		27			—			—			—			27
Excess income tax benefit from share-based compensation		—		—		48			—			—			—			48
Acquisition of noncontrolling interest in NASDI, LLC		—		—		(40	)		—			—			1,973			1,933
Dividends declared and paid		—		—		—			(3,473	)		—			—			(3,473	)
Dividend equivalents paid on restricted stock units		—		—		—			(20	)		—			—			(20	)
Net income		—		—		—			9,700			—			525			10,225
Other comprehensive loss—net of tax		—		—		—			—			(1,152	)		—			(1,152	)
BALANCE—September 30, 2011		58,960,444	$	6	$	267,297		$	18,468		$	(795	)	$	370		$	285,346

See notes to unaudited condensed consolidated financial statements.

6

Great Lakes Dredge & Dock Corporation and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(Unaudited)

(in thousands)

	Nine Months Ended
	September 30,
	2012			2011
OPERATING ACTIVITIES:
Net income	$	3,147		$	10,225
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization		26,637			29,999
Equity in (earnings) loss of joint ventures		(153	)		108
Loss on extinguishment of 7 3/4% senior subordinated notes		—			5,145
Deferred income taxes		1,386			8,793
Gain on dispositions of property and equipment		(232	)		(2,902	)
Gain on adjustment of contingent earnout		(240	)		(1,122	)
Amortization of deferred financing fees		957			1,181
Unrealized foreign currency loss		207			525
Share-based compensation expense		2,389			1,224
Excess income tax benefit from share-based compensation		(139	)		(48	)
Changes in assets and liabilities:
Accounts receivable		(16,260	)		(13,279	)
Contract revenues in excess of billings		(33,545	)		(893	)
Inventories		(10,616	)		(4,524	)
Prepaid expenses and other current assets		(16,027	)		(11,641	)
Accounts payable and accrued expenses		(1,733	)		(9,027	)
Billings in excess of contract revenues		7,189			728
Other noncurrent assets and liabilities		(2,177	)		(866	)
Net cash flows provided by (used in) by operating activities		(39,210	)		13,626
INVESTING ACTIVITIES:
Purchases of property and equipment		(30,015	)		(24,901	)
Proceeds from dispositions of property and equipment		563			7,452
Net cash flows used in investing activities		(29,452	)		(17,449	)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		—			250,000
Redemption of 7 3/4% senior subordinated notes		—			(175,000	)
Senior subordinated notes redemption premium		—			(2,264	)
Deferred financing fees		(2,039	)		(5,962	)
Distributions paid to minority interests		(133	)		—
Dividends paid		(3,726	)		(3,473	)
Dividend equivalents paid on restricted stock units		(39	)		(20	)
Taxes paid on settlement of vested share awards		(212	)		(291	)
Repayments of equipment debt		(502	)		(274	)
Exercise of stock options		200			27
Excess income tax benefit from share-based compensation		139			48
Net cash flows provided by (used in) financing activities		(6,312	)		62,791
Effect of foreign currency exchange rates on cash and cash equivalents		10			(396	)
Net increase (decrease) in cash and cash equivalents		(74,964	)		58,572
Cash and cash equivalents at beginning of period		113,288			48,478
Cash and cash equivalents at end of period	$	38,324		$	107,050
Supplemental Cash Flow Information
Cash paid for interest	$	19,051		$	12,714
Cash paid (refunded) for income taxes	$	(4,840	)	$	5,282
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$	7,693		$	3,366
Property and equipment purchased on capital leases and equipment notes	$	—		$	2,085
Acquisition of noncontrolling interest in NASDI, LLC	$	—		$	40

See notes to unaudited condensed consolidated financial statements.

7

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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

1. Basis of presentation

The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Great Lakes Dredge & Dock Corporation and Subsidiaries (the “Company” or “Great Lakes”) and the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011. 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 September 30, 2012, and its results of operations for the three and nine months ended September 30, 2012 and 2011 and cash flows for the nine months ended September 30, 2012 and 2011 have been included.

The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel 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. Generally, capital projects have the highest margins due to the complexity of the projects, while beach nourishment projects have the most volatile margins because they are most often exposed to variability in weather conditions.

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% to 25% 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 operates in two reportable segments: dredging and demolition. These reportable segments are the Company’s operating segments and the reporting units at which the Company tests goodwill for impairment. The Company performed its most recent annual test of impairment as of July 1, 2012 for the goodwill in both the dredging and demolition segments with no indication of goodwill impairment as of the test date. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2013.

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.

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 similar 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 nine months ended September 30, 2012 and the three and nine months ended September 30, 2011, zero options to purchase shares of common stock were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method. In addition, and in accordance with the treasury stock method, 462 thousand shares of potentially dilutive stock options and restricted stock units were excluded from the diluted weighted-average common shares outstanding for the three months ended September 30, 2012, as the Company incurred a loss during this period. The impact of such shares would have been antidilutive. The computations for basic and diluted earnings per share from continuing operations are as follows:

8

	Three Months Ended					Nine Months Ended
(shares in thousands)	September 30,					September 30,
	2012			2011		2012		2011
Net income (loss) attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	(2,132	)	$	5,602	$	3,373	$	9,700
Weighted-average common shares outstanding — basic		59,253			58,930		59,154		58,863
Effect of stock options and restricted stock units		—			231		413		670
Weighted-average common shares outstanding — diluted		59,253			59,161		59,567		59,533
Earnings (loss) per share — basic	$	(0.04	)	$	0.10	$	0.06	$	0.16
Earnings (loss) per share — diluted	$	(0.04	)	$	0.09	$	0.06	$	0.16

3. Accounts receivable and contracts in progress

Accounts receivable at September 30, 2012 and December 31, 2011 are as follows:

	September 30,			December 31,
	2012			2011
Completed contracts	$	27,119		$	38,317
Contracts in progress		94,671			69,469
Retainage		21,788			20,692
		143,578			128,478
Allowance for doubtful accounts		(750	)		(1,839	)
Total accounts receivable—net	$	142,828		$	126,639
Current portion of accounts receivable—net	$	134,244		$	120,268
Long-term accounts receivable and retainage		8,584			6,371
Total accounts receivable—net	$	142,828		$	126,639

9

The components of contracts in progress at September 30, 2012 and December 31, 2011 are as follows:

	September 30,			December 31,
	2012			2011
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	333,058		$	173,187
Amounts billed		(274,273	)		(152,045	)
Costs and earnings in excess of billings for contracts in progress		58,785			21,142
Costs and earnings in excess of billings for completed contracts		3,361			7,459
Total contract revenues in excess of billings	$	62,146		$	28,601
Current portion of contract revenues in excess of billings	$	62,146		$	26,412
Portion included in other noncurrent assets		—			2,189
Total contract revenues in excess of billings	$	62,146		$	28,601
Billings in excess of costs and earnings:
Amounts billed	$	(451,568	)	$	(427,797	)
Costs and earnings for contracts in progress		430,751			414,170
Total billings in excess of contract revenues	$	(20,817	)	$	(13,627	)

4. 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 September 30, 2012 and December 31, 2011, the Company held certain derivative contracts that it uses to manage foreign currency risk, commodity price risk and interest rate 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:

10

			Fair Value Measurements at Reporting Date Using
Description	At September 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Interest rate swap contracts	$	430	$	—	$	430	$	—
Liabilities
Fuel hedge contracts	$	459	$		$	459	$
Foreign exchange contracts		13		—		13		—
Total liabilities measured at fair value	$	472	$	—	$	472	$	—
			Fair Value Measurements at Reporting Date Using
Description	At December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	449	$	—	$	449	$	—
Interest rate swap contracts		755		—		755		—
Foreign exchange contracts		155		—		155		—
Total assets measured at fair value	$	1,359	$	—	$	1,359	$	—

Interest rate swap contracts

In May 2009, the Company entered into two interest rate swap arrangements, which are effective through December 15, 2012, to swap a notional amount of $50 million from a fixed rate of 7.75% to a floating LIBOR-based rate in order to manage the interest rate paid with respect to the Company’s 7.75% senior subordinated notes. Although the senior subordinated notes were redeemed in January 2011, the swaps remain in place. The swaps are not accounted for as a hedge; therefore, the changes in fair value are recorded as adjustments to interest expense in each reporting period.

The Company previously verified the fair value of the interest rate swap contracts using a quantitative model that contained both observable and unobservable inputs. The unobservable inputs related primarily to the implied LIBOR forward rate and the long-term nature of the contracts. As of December 31, 2011, the unobservable inputs began to be corroborated by observable market data and accordingly the Company transferred the swaps into Level 2 of the fair value hierarchy. The change in Level 3 interest rate swap contracts during the comparable quarter of the prior year was as follows:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2011
Interest rate swap contracts
Balance at January 1	$	1,264
Total unrealized gains (losses) included in earnings		(511	)
Settlements		445
Balance at September 30	$	1,198
Balance at July 1	$	1,141
Total unrealized gains (losses) included in earnings		57
Settlements		—
Balance at September 30	$	1,198

11

Foreign exchange contracts

The Company has exposure to foreign currencies that fluctuate in relation to the U.S. dollar. The Company periodically enters into foreign exchange forward contracts to hedge this risk. At September 30, 2012 and December 31, 2011, the Company had one outstanding contract related to the Brazilian Real. This foreign exchange contract is not accounted for as a hedge.

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 backlog.

As of September 30, 2012, 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 2013. As of September 30, 2012, there were 5.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted fuel purchases through March 2013. Under these swap agreements, the Company will pay fixed prices ranging from $2.86 to $3.29 per gallon.

At each balance sheet date, unrealized gains and losses on fuel hedge contracts are recorded as a component of accumulated other comprehensive income (loss) in the condensed consolidated balance sheets. Gains and losses realized upon settlement of fuel hedge contracts are reclassified from accumulated other comprehensive income (loss) as the fuel is utilized and included in fuel expense, which is a component of costs of contract revenues in the condensed consolidated statements of operations.

At September 30, 2012, the fair value liability of the fuel hedge contracts was estimated to be $459 and is recorded in accrued expenses. At December 31, 2011 the fair value asset of the fuel hedge contracts was estimated to be $449 and is recorded in other current assets. The loss reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the nine months ended September 30, 2012 was $348. The remaining gains and losses included in accumulated other comprehensive income (loss) at September 30, 2012 will be reclassified into earnings over the next six months, corresponding to the period during which the hedged fuel is expected to be utilized. 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 fair value of the foreign exchange contracts, interest rate and fuel hedge contracts outstanding as of September 30, 2012 and December 31, 2011 is as follows:

		Fair Value at
		September 30,		December 31,
	Balance Sheet Location	2012		2011
Asset derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Other current assets	$	—	$	449
Derivatives not designated as hedges
Interest rate swaps	Other current assets		430		755
Foreign exchange contracts	Other current assets		—		155
Total asset derivatives		$	430	$	1,359
Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	459	$	—
Derivatives not designated as hedges
Foreign exchange contracts	Accrued expenses		13		—
Total liability derivatives		$	472	$	—

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, the Company issued $250,000 of 7.375% senior notes due February 1, 2019, which were outstanding at September 30, 2012. The senior notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the senior notes. The fair value of the senior notes was $263,750 at September 30, 2012, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets.

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5. Accrued expenses

Accrued expenses at September 30, 2012 and December 31, 2011 are as follows:

	September 30, 2012		December 31, 2011
Insurance	$	8,353	$	8,285
Payroll and employee benefits		7,567		10,763
Interest		3,200		7,759
Income and other taxes		1,689		1,261
Percentage of completion adjustment		1,313		1,855
Fuel hedge liability		459		—
Other		1,324		1,198
Total accrued expenses	$	23,905	$	31,121

6. Long-term debt

On June 4, 2012, the Company entered into a senior revolving credit agreement (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, which replaced the Company’s former revolving credit agreement, provides for a senior revolving credit facility in an aggregate principal amount of up to $175,000, subfacilities for the issuance of standby letters of credit up to a $125,000 sublimit, 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 $50,000. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, and the Company will be 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 prior credit agreement with Bank of America N.A. was terminated.

Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company of 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 revolving credit facility is an unsecured facility and will remain unsecured provided the Company maintains a total leverage ratio less than or equal to 3.75 to 1.00 as of the end of each fiscal quarter. If the leverage ratio exceeds 3.75 to 1.00, or an event of default occurs and is not cured within the applicable grace period, the revolving credit facility will cease to remain unsecured. In the event of the facility becomes secured, outstanding obligations shall be automatically secured by certain vessels and all domestic accounts receivable, subject to the liens and interests of other parties (including the Company’s bonding provider) holding first priority perfected liens.

The new credit facility 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. At September 30, 2012 the Company was in compliance with its debt covenants.

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 June 2012, the Company granted 497 thousand options to purchase shares of common stock and 273 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 $675 and $2,389, respectively, for the three and nine months ended September 30, 2012 and $381 and $1,224, respectively, for the three and nine months ended September 30, 2011.

13

8. Segment information

The Company and its subsidiaries currently operate in two reportable segments: dredging and demolition. 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					Nine Months Ended
	September 30,					September 30,
	2012			2011		2012		2011
Dredging
Contract revenues	$	138,811		$	134,591	$	395,944	$	396,273
Operating income		2,687			13,593		20,560		45,008
Demolition
Contract revenues	$	27,952		$	23,877	$	92,258	$	72,492
Operating income (loss)		(1,226	)		1,193		213		(5,954	)
Total
Contract revenues	$	166,763		$	158,468	$	488,202	$	468,765
Operating income		1,461			14,786		20,773		39,054

Dredging contract revenues for the nine months ended September 30, 2012 are net of $1,374 in intersegment revenues. Demolition contract revenues for the nine months ended September 30, 2012 are net of $75 in intersegment revenues. In addition, foreign dredging revenue of $36,329 and $75,202 for the three and nine months ended September 30, 2012 and $21,843 and $59,779 for the three and nine months ended September 30, 2011, respectively, was primarily attributable to work done in the Middle East as well as the early stages of mobilization for the Wheatstone LNG project in Western Australia.

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.

9. Commitments and contingencies

Commercial commitments

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. As of September 30, 2012, the Company had no borrowings and $33,252 of letters of credit outstanding, resulting in $141,748 of availability under the Credit Agreement. At September 30, 2012, the Company was in compliance with its various covenants under its Credit Agreement.

Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some demolition projects. In September 2011, the Company entered into a bonding agreement with Zurich American Insurance Company (“Zurich”) under which the Company can obtain performance, bid and payment bonds. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At September 30, 2012, the Company had outstanding performance bonds valued at approximately $457,924; however, the revenue value remaining in backlog related to these projects totaled approximately $133,252.

The Company has a $24,000 international letter of credit facility that it uses for the performance and advance payment guarantees on the Company’s foreign contracts. As of September 30, 2012, Great Lakes had no of letters of credit outstanding under this facility. At September 30, 2012, the Company also had $250,000 of 7.375% senior notes outstanding, which mature in February 2019.

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.

14

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.

The Company or its former subsidiary, NATCO Limited Partnership, was named as a defendant in approximately 251 asbestos-related personal injury lawsuits, the majority of which were filed between 1989 and 2000. The claims were filed on behalf of seamen or their personal representatives alleging injury or illness from exposure to asbestos while employed as seamen on Company-owned vessels. In these cases, the Company is typically one of many defendants, including manufacturers and suppliers of products containing asbestos, as well as other vessel owners. Following certain administrative proceedings, counsel for plaintiffs agreed to name a group of cases that they intended to pursue and to dismiss the remaining cases without prejudice. Plaintiffs previously named 40 cases against the Company that they intended to pursue, each of which involves one plaintiff. The remaining cases against the Company were dismissed without prejudice. Plaintiffs in the dismissed cases could file a new lawsuit if they develop a new disease allegedly caused by exposure to asbestos on board our vessels. Of the 40 named cases, three were subsequently dismissed, leaving 37 cases remaining. The Company is presently unable to quantify the amounts of damages being sought in the remaining lawsuits because none of the complaints specify a damage amount. Based on preliminary discovery and settlement demands received to date, the Company does not believe that it is probable that losses from these claims could be material, and an estimate of a range of losses relating to these claims cannot reasonably be made. Based on the foregoing, management does not believe that any of the remaining 37 lawsuits, individually or in the aggregate, will have a material impact on our business, financial position, results of operations or cash flows.

On August 26, 2009, the Company’s subsidiary, NASDI, LLC (“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 illegal dumping activities at a dump site NASDI contracted with to have waste materials disposed of between September 2007 and July 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 in the second quarter of 2011, but has had no further contact with the Massachusetts Attorney General’s office since then. The matter remains open, and, to the Company’s knowledge, no proceedings have currently been initiated against NASDI. Should a claim be brought, NASDI intends to defend itself vigorously. Based on consideration of all of the facts and circumstances now known, the Company does not believe this claim will have a material impact on its business, financial position, results of operations or cash flows.

On March 27, 2011, NASDI received a subpoena from a federal grand jury in the District of Massachusetts directing NASDI to furnish certain documents relating to certain projects performed by NASDI since January 2005. The Company conducted an internal investigation into this matter and continues to fully cooperate with the federal grand jury subpoena. Based on the early stage of the U.S. Department of Justice’s investigation and the limited information known to the Company, the Company cannot predict the outcome of the investigation, the U.S. Attorney’s views of the issues being investigated, any action the U.S. Attorney may take, or the impact, if any, that this matter may have on the Company’s business, financial position, results of operations or cash flows.

The Company has not accrued any amounts with respect to these two NASDI 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.

During the quarter ended March 31, 2012, a favorable judgment was rendered in the Company’s loss of use claim related to the dredge New York allision in the approach channel to Port Newark, New Jersey. In January 2008, the Company filed suit against the M/V Orange Sun and her owners for damages incurred by the Company in connection with the allision. Following a bench trial in the United States District Court in the Southern District of New York, the Court issued an opinion and order in the Company’s favor, entitling Great Lakes to $11,736 in damages plus pre-judgment interest. Judgment was rendered in the aggregate amount of $13,272. Defendants timely appealed the judgment to the United States Court of Appeals for the Second Circuit. Briefing on the appeal is now complete, and oral argument is expected to take place in the first half of 2013. The Company cannot be assured when the appeal will be heard or predict the outcome of the appellate process.

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10. Acquisition of noncontrolling interest

The Company previously owned 65% of the profits interests of NASDI. Effective January 1, 2011 the Company reacquired Mr. Christopher Berardi’s 35% membership interest in NASDI for no cost per the terms of NASDI’s limited liability company agreement. This resulted in the elimination of noncontrolling interest of $1,973 during the first quarter ended March 31, 2011. The Company now owns 100% of NASDI.

In March 2011, Mr. Berardi resigned his employment with the Company’s demolition segment effective April 29, 2011. Mr. Berardi’s resignation and the repurchase of his NASDI membership interest also resulted in the reversal of a $1,933 accrual established in conjunction with a prior restructuring of ownership interest in NASDI. This reversal was recorded directly to equity as part of the reacquisition of the noncontrolling interest.

11. Subsidiary guarantors

The Company’s long-term debt at September 30, 2012 includes $250,000 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 September 30, 2012 and December 31, 2011;

(ii) statements of operations and comprehensive income for the three and nine months ended September 30, 2012 and 2011; and

(iii) statements of cash flows for the nine months ended September 30, 2012 and 2011.

16

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF SEPTEMBER 30, 2012

(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	38,157	$	167	$	—	$	—		$	38,324
Accounts receivable — net		133,369		875		—		—			134,244
Receivables from affiliates		71,773		8,466		7,443		(87,682	)		—
Contract revenues in excess of billings		62,213		206		—		(273	)		62,146
Inventories		36,511		—		—		—			36,511
Prepaid expenses and other current assets		40,433		30		10,536		—			50,999
Total current assets		382,456		9,744		17,979		(87,955	)		322,224
PROPERTY AND EQUIPMENT—Net		313,338		45		—		—			313,383
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,317		349		—		—			98,666
INVENTORIES — Noncurrent		37,354		—		—		—			37,354
INVESTMENTS IN JOINT VENTURES		7,076		—		—		—			7,076
INVESTMENTS IN SUBSIDIARIES		3,359		—		649,387		(652,746	)		—
OTHER		11,351		3		6,629		—			17,983
TOTAL	$	853,251	$	10,141	$	673,995	$	(740,701	)	$	796,686
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	91,308	$	711	$	—	$	—		$	92,019
Payables to affiliates		61,980		3,925		21,926		(87,831	)		—
Accrued expenses		19,707		833		3,365		—			23,905
Billings in excess of contract revenues		20,808		133		—		(124	)		20,817
Current portion of long term debt		2,587		—		—		—			2,587
Total current liabilities		196,390		5,602		25,291		(87,955	)		139,328
LONG TERM NOTE PAYABLE		2,500		—		—		—			2,500
7 3/8% SENIOR NOTES		—		—		250,000		—			250,000
DEFERRED INCOME TAXES		172		—		104,177		—			104,349
OTHER		5,982		—		775		—			6,757
Total liabilities		205,044		5,602		380,243		(87,955	)		502,934
Total Great Lakes Dredge & Dock Corporation Equity		648,207		4,539		293,543		(652,746	)		293,543
NONCONTROLLING INTERESTS		—		—		209		—			209
TOTAL EQUITY		648,207		4,539		293,752		(652,746	)		293,752
TOTAL	$	853,251	$	10,141	$	673,995	$	(740,701	)	$	796,686

17

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF DECEMBER 31, 2011

(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations			Consolidated Totals
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	108,985	$	4,303	$	—	$	—		$	113,288
Accounts receivable — net		118,530		1,738		—		—			120,268
Receivables from affiliates		79,683		7,729		49,724		(137,136	)		—
Contract revenues in excess of billings		26,323		153		—		(64	)		26,412
Inventories		33,426		—		—		—			33,426
Prepaid expenses and other current assets		15,929		125		16,330		—			32,384
Total current assets		382,876		14,048		66,054		(137,200	)		325,778
PROPERTY AND EQUIPMENT—Net		310,459		61		—		—			310,520
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,474		389		—		—			98,863
INVENTORIES — Noncurrent		30,103		—		—		—			30,103
INVESTMENTS IN JOINT VENTURES		6,923		—		—		—			6,923
INVESTMENTS IN SUBSIDIARIES		4,385		—		627,754		(632,139	)		—
OTHER		10,729		3		5,547		(6	)		16,273
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345	)	$	788,460
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	81,971	$	774	$	—	$	—		$	82,745
Payables to affiliates		85,865		7,234		44,053		(137,152	)		—
Accrued expenses		22,445		629		8,047		—			31,121
Billings in excess of contract revenues		13,607		68		—		(48	)		13,627
Current portion of long term debt		3,033		—		—		—			3,033
Total current liabilities		206,921		8,705		52,100		(137,200	)		130,526
LONG TERM NOTE PAYABLE		2,500		—		—		—			2,500
7 3/4% SENIOR SUBORDINATED NOTES		—		—		250,000		—			250,000
DEFERRED INCOME TAXES		399		—		103,959		(6	)		104,352
OTHER		7,786		—		759		—			8,545
Total liabilities		217,606		8,705		406,818		(137,206	)		495,923
Total Great Lakes Dredge & Dock Corporation Equity		626,343		5,796		291,969		(632,139	)		291,969
NONCONTROLLING INTERESTS		—		—		568		—			568
TOTAL EQUITY		626,343		5,796		292,537		(632,139	)		292,537
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345	)	$	788,460

18

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME

FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2012

(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
Contract revenues	$	165,999		$	2,300		$	—		$	(1,536	)	$	166,763
Costs of contract revenues		(153,011	)		(2,268	)		—			1,536			(153,743	)
Gross profit		12,988			32			—			—			13,020
OPERATING EXPENSES:
General and administrative expenses		10,901			192			574			—			11,667
Gain on sale of assets—net		(192	)		—			84			—			(108	)
Operating income (loss)		2,279			(160	)		(658	)		—			1,461
Interest expense—net		(96	)		(36	)		(4,973	)		—			(5,105	)
Equity in earnings (loss) of subsidiaries		(37	)		—			3,585			(3,548	)		—
Equity in earnings of joint ventures		177			—			—			—			177
Loss on foreign currency transactions—net		(40	)		—			—			—			(40	)
Income (loss) before income taxes		2,283			(196	)		(2,046	)		(3,548	)		(3,507	)
Income tax (provision) benefit		1,461			—			(106	)		—			1,355
Net income (loss)		3,744			(196	)		(2,152	)		(3,548	)		(2,152	)
Net loss attributable to noncontrolling interests		—			—			20			—			20
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	3,744		$	(196	)	$	(2,132	)	$	(3,548	)	$	(2,132	)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	4,486		$	(196	)	$	(1,390	)	$	(4,290	)	$	(1,390	)

19

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME

FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2011

(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
Contract revenues	$	155,426		$	6,796		$	—		$	(3,754	)	$	158,468
Costs of contract revenues		(127,306	)		(7,525	)		—			3,754			(131,077	)
Gross profit		28,120			(729	)		—			—			27,391
OPERATING EXPENSES:
General and administrative expenses		11,630			214			892			—			12,736
Gain on sale of assets—net		(131	)		—			—			—			(131	)
Operating income (loss)		16,621			(943	)		(892	)		—			14,786
Interest expense—net		(450	)		(61	)		(5,060	)		—			(5,571	)
Equity in earnings (loss) of subsidiaries		208			—			14,864			(15,072	)		—
Equity in earnings of joint ventures		606			—			—			—			606
Loss on foreign currency transactions, net		(526	)		(18	)		—			—			(544	)
Income (loss) before income taxes		16,459			(1,022	)		8,912			(15,072	)		9,277
Income tax (provision) benefit		(365	)		—			(3,253	)		—			(3,618	)
Net income (loss)		16,094			(1,022	)		5,659			(15,072	)		5,659
Net income attributable to noncontrolling interests		—			—			(57	)		—			(57	)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	16,094		$	(1,022	)	$	5,602		$	(15,072	)	$	5,602
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	15,190		$	(1,022	)	$	4,698		$	(14,168	)	$	4,698

20

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME

FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012

(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
Contract revenues	$	487,910		$	6,350		$	—		$	(6,058	)	$	488,202
Costs of contract revenues		(430,493	)		(6,836	)		—			6,058			(431,271	)
Gross profit		57,417			(486	)		—			—			56,931
OPERATING EXPENSES:
General and administrative expenses		34,149			540			1,701			—			36,390
Gain on sale of assets—net		(327	)		—			95			—			(232	)
Operating income (loss)		23,595			(1,026	)		(1,796	)		—			20,773
Interest expense—net		(634	)		(87	)		(15,026	)		—			(15,747	)
Equity in earnings (loss) of subsidiaries		(639	)		—			22,282			(21,643	)		—
Equity in earnings of joint ventures		153			—			—			—			153
Loss on foreign currency transactions—net		(55	)		—			—			—			(55	)
Income (loss) before income taxes		22,420			(1,113	)		5,460			(21,643	)		5,124
Income tax (provision) benefit		336			—			(2,313	)		—			(1,977	)
Net income (loss)		22,756			(1,113	)		3,147			(21,643	)		3,147
Net loss attributable to noncontrolling interests		—			—			226			—			226
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	22,756		$	(1,113	)	$	3,373		$	(21,643	)	$	3,373
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	22,210		$	(1,117	)	$	2,823		$	(21,093	)	$	2,823

21

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2011 (In thousands)
	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
Contract revenues	$	460,688		$	16,382		$	—		$	(8,305	)	$	468,765
Costs of contract revenues		(387,094	)		(15,377	)		—			8,305			(394,166	)
Gross profit		73,594			1,005			—			—			74,599
OPERATING EXPENSES:
General and administrative expenses		35,356			635			2,456			—			38,447
Gain on sale of assets—net		(2,902	)		—			—			—			(2,902	)
Operating income (loss)		41,140			370			(2,456	)		—			39,054
Interest expense—net		(579	)		(160	)		(15,693	)		—			(16,432	)
Equity in earnings (loss) of subsidiaries		1,422			—			42,982			(44,404	)		—
Equity in earnings of joint ventures		(108	)		—			—			—			(108	)
Loss on foreign currency transactions, net		(526	)		(18	)		—			—			(544	)
Loss on extinguishment of debt		—			—			(5,145	)		—			(5,145	)
Income (loss) before income taxes		41,349			192			19,688			(44,404	)		16,825
Income tax (provision) benefit		2,863			—			(9,463	)		—			(6,600	)
Net income (loss)		44,212			192			10,225			(44,404	)		10,225
Net income attributable to noncontrolling interests		—			—			(525	)		—			(525	)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	44,212		$	192		$	9,700		$	(44,404	)	$	9,700
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	43,060		$	192		$	8,548		$	(43,252	)	$	8,548

22

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012 (In thousands)
	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(9,782	)	$	57		$	(29,485	)	$	—	$	(39,210	)
INVESTING ACTIVITIES:
Purchases of property and equipment		(30,015	)		—			—			—		(30,015	)
Proceeds from dispositions of property and equipment		563			—			—			—		563
Net cash flows used in investing activities		(29,452	)		—			—			—		(29,452	)
FINANCING ACTIVITIES:
Deferred financing fees		—			—			(2,039	)		—		(2,039	)
Distributions paid to minority interests		—			—			(133	)		—		(133	)
Dividends paid		—			—			(3,726	)		—		(3,726	)
Dividend equivalents paid on restricted stock units		—			—			(39	)		—		(39	)
Taxes paid on settlement of vested share awards		—			—			(212	)		—		(212	)
Net change in accounts with affiliates		(31,092	)		(4,203	)		35,295			—		—
Repayments of equipment debt		(502	)		—			—			—		(502	)
Exercise of stock options		—			—			200			—		200
Excess income tax benefit from share-based compensation		—			—			139			—		139
Net cash flows provided by (used in) financing activities		(31,594	)		(4,203	)		29,485			—		(6,312	)
Effect of foreign currency exchange rates on cash and cash equivalents		—			10			—			—		10
Net decrease in cash and cash equivalents		(70,828	)		(4,136	)		—			—		(74,964	)
Cash and cash equivalents at beginning of period		108,985			4,303			—			—		113,288
Cash and cash equivalents at end of period	$	38,157		$	167		$	—		$	—	$	38,324

23

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2011 (In thousands)
	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	41,250		$	(640	)	$	(26,984	)	$	—	$	13,626
INVESTING ACTIVITIES:
Purchases of property and equipment		(24,894	)		(7	)		—			—		(24,901	)
Proceeds from dispositions of property and equipment		7,452			—			—			—		7,452
Net cash flows used in investing activities		(17,442	)		(7	)		—			—		(17,449	)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		—			—			250,000			—		250,000
Redemption of 7 3/4% senior subordinated notes		—			—			(175,000	)		—		(175,000	)
Senior subordinated notes redemption premium		—			—			(2,264	)		—		(2,264	)
Deferred financing fees		—			—			(5,962	)		—		(5,962	)
Dividends paid		—			—			(3,473	)		—		(3,473	)
Dividend equivalents paid on restricted stock units		—			—			(20	)		—		(20	)
Taxes paid on vested share awards		—			—			(291	)				(291	)
Net change in accounts with affiliates		33,524			2,557			(36,081	)		—		—
Capital contributions		(3,205	)		3,205			—			—		—
Repayments of equipment debt		(274	)		—			—			—		(274	)
Exercise of stock options		—			—			27			—		27
Excess income tax benefit from share-based compensation		—			—			48			—		48
Net cash flows provided by financing activities		30,045			5,762			26,984			—		62,791
Effect of foreign currency exchange rates on cash and cash equivalents		—			(396	)		—			—		(396	)
Net increase in cash and cash equivalents		53,853			4,719			—			—		58,572
Cash and cash equivalents at beginning of period		48,416			62			—			—		48,478
Cash and cash equivalents at end of period	$	102,269		$	4,781		$	—		$	—	$	107,050

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

Cautionary Note Regarding Forward-Looking Statements

Certain statements in this Quarterly Report on Form 10-Q may constitute “forward-looking” statements as defined in Section 27A of the Securities Act of 1933 (the “Securities Act”), Section 21E of the Securities Exchange Act of 1934 (the “Exchange Act”), the Private Securities Litigation Reform Act of 1995 (the “PSLRA”) or in releases made by the Securities and Exchange Commission (the “SEC”), all as may be amended from time to time. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause the actual results, performance or achievements of Great Lakes Dredge & Dock Corporation and its subsidiaries (“Great Lakes” or the “Company”), or industry results, to differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements. Statements that are not historical fact are forward-looking statements. Forward-looking statements can be identified by, among other things, the use of forward-looking language, such as the words “plan,” “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “may,” “would,” “could,” “should,” “seeks,” or “scheduled to,” or other similar words, or the negative of these terms or other variations of these terms or comparable language, or by discussion of strategy or intentions. These cautionary statements are being made pursuant to the Securities Act, the Exchange Act and the PSLRA with the intention of obtaining the benefits of the “safe harbor” provisions of such laws. Great Lakes cautions investors that any forward-looking statements made by Great Lakes are not guarantees or indicative of future performance. Important assumptions and other important factors that could cause actual results to differ materially from those forward-looking statements with respect to Great Lakes, include, but are not limited to, risks associated with Great Lakes’ leverage, fixed price contracts, dependence on government contracts and funding, bonding requirement and obligations, international operations, backlog, severe weather related costs, uncertainty related to pending litigation, government regulation, restrictive debt covenants and fluctuations in quarterly operations, and those factors, risks and uncertainties that are described in Item 1A “Risk Factors” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 and in other securities filings by Great Lakes with the SEC.

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

General

The Company is the largest provider of dredging services in the United States. In addition, the Company is the only U.S. dredging service provider with significant international operations, which represented 19% of its dredging revenues for the first nine months of 2012, compared with the Company’s prior three year average of 17%. The mobility of the Company’s fleet enables the Company to move equipment in response to changes in demand for dredging services.

Dredging generally involves the enhancement or preservation of navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. The U.S. dredging market consists of three primary types of work: capital, beach nourishment and maintenance. The Company’s “bid market” is defined as the aggregate dollar value of domestic projects on which the Company bid or could have bid if not for capacity constraints. The Company experienced an average combined bid market share in the U.S. of 39% over the prior three years, including 41%, 60% and 32% of the domestic capital, beach nourishment and maintenance sectors, respectively. Rivers & lakes bid market share during the prior year of ownership by the Company is 39%.

The Company’s largest domestic dredging customer is the U.S. Army Corps of Engineers (the “Corps”), which is responsible for federally funded projects related to navigation and flood control of U.S. waterways. In the first nine months of 2012, the Company’s dredging revenues earned from contracts with federal government agencies, including the Corps as well as other federal entities such as the U.S. Coast Guard and the U.S. Navy, and third parties operating under contracts with federal agencies, were approximately 72% of dredging revenues, above the Company’s prior three year average of 59%.

The Company’s demolition subsidiaries are a major U.S. provider of commercial and industrial demolition services. Historically, the majority of the work was performed in the New England area. Through increased collaboration with Great Lakes’ other lines of business, the demolition operations continue to expand into the New York area and marine demolition markets, specifically bridge demolition. In the first nine months of 2012, demolition revenues accounted for 19% of total revenues, above the prior three year average of 12%. The demolition segment’s principal services consist of exterior and interior demolition of commercial and industrial buildings, dismantling and disposal of aged or failing bridges, site development, salvage and recycling of related materials and removal of hazardous substances and materials. The Company’s demolition operations are one of a few providers in New England with the required licenses, operating expertise, equipment fleet and access to bonding to execute larger, complex industrial demolition projects.

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The Company also owns 50% of Amboy Aggregates (“Amboy”) and 50% of TerraSea Environmental Solutions (“TerraSea”) as joint ventures. Amboy’s primary business is dredging sand from the entrance channel to the New York harbor in order to provide sand and aggregate for use in road and building construction and for clean land fill. Amboy also imports stone from upstate New York and Nova Scotia and distributes it throughout the New York area. TerraSea is engaged in the environmental services business through its ability to remediate contaminated soil and dredged sediment treatment. The Company operates in two reportable segments: dredging and demolition. These reportable segments are the Company’s operating segments and the reporting units at which the Company tests goodwill for impairment.

Results of Operations

The following tables set forth the components of net income (loss) attributable to Great Lakes Dredge & Dock Corporation and Adjusted EBITDA, as defined below, as a percentage of contract revenues for the three and nine months ended September 30, 2012 and 2011:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Contract revenues		100.0	%		100.0	%		100.0	%		100.0	%
Costs of contract revenues		(92.2	)		(82.7	)		(88.3	)		(84.1	)
Gross profit		7.8			17.3			11.7			15.9
General and administrative expenses		7.0			8.0			7.5			8.2
Gain on sale of assets—net		(0.1	)		(0.1	)		0.0			(0.6	)
Operating income		0.9			9.4			4.2			8.3
Interest expense—net		(3.1	)		(3.5	)		(3.2	)		(3.5	)
Equity in earnings (loss) of joint ventures		0.1			0.4			0.0			0.0
Loss on foreign currency transactions—net		0.0			(0.3	)		0.0			(0.1	)
Loss on extinguishment of debt		0.0			0.0			0.0			(1.1	)
Income (loss) before income taxes		(2.1	)		6.0			1.0			3.6
Income tax provision		0.8			(2.3	)		(0.4	)		(1.4	)
Net income (loss)		(1.3	)		3.7			0.6			2.2
Net (income) loss attributable to noncontrolling interests		0.0			0.0			0.0			(0.1	)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation		(1.3	)%		3.7	%		0.6	%		2.1	%
Adjusted EBITDA		7.3	%		16.4	%		9.8	%		14.5	%

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

26

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
(in thousands)	2012			2011		2012		2011
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	(2,132	)	$	5,602	$	3,373	$	9,700
Adjusted for:
Loss on extinguishment of debt		—			—		—		5,145
Interest expense—net		5,105			5,571		15,747		16,432
Income tax provision (benefit)		(1,355	)		3,618		1,977		6,600
Depreciation and amortization		10,514			11,195		26,637		29,999
Adjusted EBITDA	$	12,132		$	25,986	$	47,734	$	67,876

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

	Three Months Ended							Nine Months Ended
	September 30,							September 30,
Revenues (in thousands)	2012		2011		Change			2012		2011		Change
Dredging:
Capital—U.S.	$	45,456	$	39,778		14.3	%	$	117,066	$	130,287		(10.1	)%
Capital—foreign		36,329		21,843		66.3	%		75,202		59,779		25.8	%
Beach nourishment		20,935		41,714		(49.8	)%		92,576		87,947		5.3	%
Maintenance		26,060		16,583		57.1	%		85,299		92,525		(7.8	)%
Rivers & lakes		10,031		14,673		(31.6	)%		25,801		25,735		0.3	%
Total dredging revenues		138,811		134,591		3.1	%		395,944		396,273		(0.1	)%
Demolition		27,952		23,877		17.1	%		92,258		72,492		27.3	%
Total revenues	$	166,763	$	158,468		5.2	%	$	488,202	$	468,765		4.1	%

Total revenue for the 2012 third quarter was $166.8 million, up $8.3 million or 5% from $158.5 million during the 2011 third quarter. For the nine months ended September 30, 2012, total revenue increased to $488.2 million from $468.8 million during such period in 2011, an increase of 4%. Dredging contract revenues for the nine months ended September 30, 2012 are net of $1.4 million in intersegment revenues. Demolition contract revenues for the nine months ended September 30, 2012 are net of $0.1 million in intersegment revenues. For the nine months ended September 30, 2012, total dredging revenues were in line with dredging revenues from the first nine months of 2011 with foreign capital revenue and beach nourishment revenue increasing and domestic capital revenue and maintenance revenue decreasing and rivers & lakes maintaining from the respective period in the prior year. Demolition revenue for the nine months ended September 30, 2012 increased $19.8 million, or 27% compared to the prior year adding to the increased total revenues for the Company.

Capital dredging consists primarily of port expansion projects, which involve the deepening of channels to allow access by larger, deeper draft ships and the provision of land fill used to expand port facilities. In addition to port work, capital projects also include land reclamations, trench digging for pipelines, tunnels and cables, and other dredging related to the construction of breakwaters, jetties, canals and other marine structures. Domestic capital dredging revenue increased to $45.5 million, adding $5.7 million, or 14%, in the 2012 third quarter compared to the 2011 third quarter. Domestic capital dredging revenue decreased $13.2 million, or 10%, in the first nine months of 2012 compared to the same period in 2011. Domestic capital dredging revenues in the quarter and nine months ended September 30, 2012 continued to be generated by work in the Ports of New York, as well as projects in Florida, Delaware and Louisiana. Capital dredging for the first nine months of 2011 included the completion of our work on the construction of sand berms off the coast of Louisiana, which accounted for approximately $19.7 million of revenue that did not reoccur in 2012.

Foreign dredging revenue strongly increased $14.5 million, or 66%, for the third quarter of 2012 to $36.3 million, and increased $15.4 million to $75.2 million for the nine months ended September 30, 2012. The third quarter 2012 foreign revenue was driven by several projects in Bahrain, primarily our East Hidd land reclamation project as well as the early stages of mobilization for the Wheatstone LNG project in Western Australia.

Beach nourishment projects involve moving sand from the ocean floor to shoreline locations where erosion threatens shoreline assets. Beach nourishment revenue in the 2012 third quarter decreased $20.8 million, or 50%, from the 2011 third quarter. Year to date 2012 beach nourishment revenue increased $4.6 million, or 5%, compared to the first three quarters of 2011. In the prior year, a significant number of beach nourishment jobs were bid and awarded in the second and third quarter which drove prior year third quarter revenue higher as the dredging work was performed and revenue was earned. This drove the change from the prior year period. In the 2012 third quarter, the Company worked on beach nourishment projects in Florida, Virginia and California.

27

Maintenance dredging consists of the re-dredging of previously deepened waterways and harbors to remove silt, sand and other accumulated sediments. Due to natural sedimentation, most channels generally require maintenance dredging every one to three years, thus creating a recurring source of dredging work that is typically non-deferrable if optimal navigability is to be maintained. In addition, severe weather such as hurricanes, flooding and droughts can also cause the accumulation of sediments and drive the need for maintenance dredging. Maintenance revenue in the 2012 third quarter increased by $9.5 million, or 57%, compared to the 2011 third quarter. In the quarter ended September 30, 2012, maintenance revenue included a large project in Louisiana and projects on the Mississippi River that were unique due to the drought in the Midwest U.S. during 2012. Maintenance revenue in the first nine months of 2012 decreased by $7.2 million, or 8%, compared to the first nine months of 2011. Maintenance revenue in the first half of 2011 was atypically high as the Company performed maintenance projects that had been delayed from 2010 in order to work on construction of sand berms off the coast of Louisiana, partially offset by the increase in Mississippi River projects mentioned above. In addition to performing maintenance dredging on the Mississippi River and in Louisiana, the Company also had projects in Delaware and Maryland during the third quarter of 2012.

Domestic rivers & lakes dredging and related operations typically consist of lake and river dredging, inland levee and construction dredging, environmental restoration and habitat improvement and other marine construction projects. Rivers & lakes revenue in the third quarter of 2012 was $10.0 million, a decrease of $4.6 million or 32% compared to the third quarter of 2011. The decrease in the current quarter relates to a large dollar value contract in the third quarter of 2011 that did not reoccur in the current year. Rivers & lakes revenue in the first nine months of 2012 was $25.8 million, in line with the revenue reported for the first nine months of 2011. Rivers & lakes continued work on its large municipal lake project in Texas as well as other projects along the Mississippi River during the third quarter of 2012.

Consolidated gross profit for the 2012 third quarter decreased by 52% to $13.0 million, from $27.4 million in the third quarter of 2011. Gross profit margin (gross profit divided by revenue) for the 2012 third quarter decreased to 7.8% from 17.3% in the 2011 third quarter. The decrease in consolidated gross profit and gross profit margin in the 2012 third quarter was primarily due to lower fixed cost coverage as Hurricane Isaac delayed four large dredging projects, as well as reduced equipment production that delayed the schedule and margin on existing projects. Gross profit for the nine months ended September 30, 2012 decreased by 24% to $56.9 million from $74.6 million in the same 2011 period, resulting in a decline in gross profit margin to 11.7% from 15.9%. The nine month 2012 gross profit margin was lower due to weather impacts in the first and third quarters of 2012 and equipment production delays both of which lower dredge fixed cost coverage.

The Company’s general and administrative expenses totaled $11.7 million and $36.4 million for the three and nine months ended September 30, 2012. General and administrative expenses totaled $12.7 million and $38.4 million for the three and nine months ended September 30, 2011. In the third quarter of 2011, there was a $1.1 million reduction of the liability related to the earnout potentially payable, related to the Matteson acquisition that was unique to that period. Also, the current quarter ended September 30, 2012 reflects $1.6 million in lower legal and bad debt expense as compared to the same period in the prior year. In addition, amortization costs related to intangible assets from the Matteson acquisition have become fully amortized, representing a decrease in general and administrative expenses of $0.6 million and $1.7 million for the quarter and nine months ended 2012 over the same periods in the prior year.

Operating income for the three months ended September 30, 2012 decreased 90% to $1.5 million, while operating income for the nine months ended September 30, 2012 decreased 47% to $20.8 million, respectively, compared to the same periods of 2011.

The Company’s net interest expense totaled $5.1 million and $15.7 million, for the three and nine months ended September 30, 2012, respectively, compared to $5.6 million and $16.4 million from the same period of 2011. The net interest expense in the three months ended September 30, 2012 is slightly lower primarily due to a reduction in the amount and rates on our equipment capital leases. In the first quarter of 2011, the Company had two debt issuances outstanding at the same time that added duplicative interest expense of $1.1 million.

Income tax expense for the three and nine months ended September 30, 2012 was a benefit of $1.4 million and a provision of $2.0 million, respectively, compared to $3.6 million and $6.6 million of provision for the same 2011 periods. This decrease was primarily attributable to the lower earnings generated in 2012. The effective tax rate for the nine months ended September 30, 2012 was 38.6%, which is substantially consistent with the effective tax rate of 39.2% for the same period of 2011. The Company expects the tax rate for the full year to remain near 39%.

Net loss attributable to Great Lakes Dredge & Dock Corporation was $2.1 million and the loss per diluted share was $0.04 for the 2012 third quarter compared to net income attributable to Great Lakes Dredge & Dock Corporation of $5.6 million and earnings per share of $0.09 for the same 2011 period. Net income attributable to Great Lakes Dredge & Dock Corporation and earnings per diluted share for the nine months ended September 30, 2012 was $3.4 million and $0.06, respectively, compared to $9.7 million and $0.16 for the same 2011 period. The decrease in the third quarter of 2012 is due to the lower operating income for the period described above, partially offset by the resulting income tax benefit. Net income in 2011 was reduced by a $5.1 million loss on extinguishment of debt.

28

Adjusted EBITDA (as defined on page 26) was $12.1 million and $47.7 million for the three and nine months ended September 30, 2012, respectively, compared with $26.0 million and $67.9 million in the same 2011 periods, for the reasons discussed above.

Results by segment

Dredging

Dredging revenues for the three and nine months ended September 30, 2012 were $138.8 million and $395.9 million, respectively, compared to $134.6 million and $396.3 million for the same periods of 2011. Dredging revenues for the nine months ended September 30, 2012 were in line with dredging revenues from the same period in 2011. The dredging segment for the three months ended September 30, 2012 included increases in domestic and foreign capital as well as maintenance revenues. These increases for the quarter were partially offset by lower beach nourishment and rivers & lakes revenues. Dredging revenue for the nine months contained larger dollar valued contracts in foreign capital jobs which drove the increased revenue in this category over the same period in the prior year. The domestic production mix experienced increases in beach nourishment revenue, offset by decreases in domestic capital and maintenance revenue year to date in 2012.

Gross profit margin in the dredging segment was 9.0% and 13.0% for the three and nine months ended September 30, 2012 compared to gross profit margin in the dredging segment of 17.5% and 18.4% for the three and nine months ended September 30, 2011, respectively. Dredging gross profit declined as Hurricane Isaac delayed four large dredging projects as well as reduced equipment production that delayed the schedule and margin on existing projects. These also impacted the gross profit margin for the nine months ended September 30, 2012 along with lower margins in a slow first quarter of 2012, which had been impacted by the mix of project types and offshore weather conditions.

Dredging segment operating income was $2.7 million and $20.6 million for the three and nine months ended September 30, 2012, compared to operating income of $13.6 million and $45.0 million for the three and nine months ended September 30, 2011, respectively. The decrease in operating income for the nine months ended September 30, 2012 is a result of the decrease in gross profit in the first and third quarters of 2012, as mentioned above, along with additional general and administrative payroll and benefits of $2.4 million in the nine months ended September 30, 2012, the $2.1 million gain on the sale of the dredge Victoria Island in 2011 and a $1.1 million reduction in 2011 of the liability related to the earnout potentially payable, related to the Matteson acquisition. These items were partially offset as the nine months ended September 30, 2011 included a $1.7 million of amortization costs related to intangible assets from the Matteson acquisition, which have become fully amortized and are not included in 2012.

Demolition

Demolition revenues for the three and nine months ended September 30, 2012 totaled $28.0 million and $92.3 million, respectively, compared to $23.9 million and $72.5 million for the same 2011 periods. The demolition segment experienced higher revenue levels in 2012 driven by bridge demolition work and large site development projects in New York as new demolition management has focused on large projects with higher margins.

Gross profit margin in the demolition segment was 2.0% and 5.9% for the three and nine months ended September 30, 2012 compared to a gross margin of 15.8% and 2.2% for the three and nine months ended September 30, 2011, respectively. The demolition segment generated an operating loss of $1.2 million and operating income of $0.2 million for the three and nine months ended September 30, 2012, respectively, compared to operating income of $1.2 million and an operating loss of $5.9 million for the same periods of 2011. The increase in operating income during the first nine months of 2012 is due to the increase in gross profit, and $1.6 million of higher legal expense in 2011, which did not occur in the current year.

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Bidding Activity and Backlog

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

	September 30,		December 31,		September 30,
Backlog (in thousands)	2012		2011		2011
Dredging:
Capital - U.S.	$	96,354	$	109,897	$	109,568
Capital - foreign		243,542		78,379		40,675
Beach nourishment		41,875		84,607		117,543
Maintenance		46,555		31,293		16,187
Rivers & lakes		34,827		15,256		13,391
Dredging Backlog		463,153		319,432		297,364
Demolition		42,574		50,672		68,029
Total Backlog	$	505,727	$	370,104	$	365,393

The Company’s contract backlog represents its estimate of the revenues that will be realized under the portion of the contracts remaining to be performed. For dredging contracts these estimates are based primarily upon the time and costs required to mobilize the necessary assets to and from the project site, the amount and type of material to be dredged and the expected production capabilities of the equipment performing the work. For demolition contracts, these estimates are based on the time and remaining costs required to complete the project, relative to total estimated project costs and project revenues agreed to with the customer. However, these estimates are necessarily subject to variances based upon actual circumstances. Because of these factors, as well as factors affecting the time required to complete each job, backlog is not always indicative of future revenues or profitability. In addition, 31% of the Company’s dredging backlog relates to federal government contracts, which can be canceled at any time without penalty to the government, subject to the Company’s contractual right to recover the Company’s actual committed costs and profit on work performed up to the date of cancellation. In addition, the Company’s backlog may fluctuate significantly from quarter to quarter based upon the type and size of the projects the Company is awarded from the bid market. A quarterly increase or decrease of the Company’s backlog does not necessarily result in an improvement or a deterioration of the Company’s business. The Company’s backlog includes only those projects for which the Company has obtained a signed contract with the customer.

The domestic dredging bid market for the 2012 third quarter totaled $324.9 million, resulting in $678.1 million of work awarded during the first nine months of 2012. This represents a decrease of $169.2 million from the same period in the prior year. The quarter ended September 30^th typically represents the largest bidding quarter of each calendar year as this quarter coincides with the end of the U.S. government’s fiscal year. The bid market in the third quarter of 2011 was larger as there were a greater number of large contract value beach nourishment and domestic capital projects let to bid by governmental agencies. For the contracts released in the current year, the Company won 43%, or $48.0 million, of the beach nourishment projects awarded through September 30, 2012, as well as 25%, or $91.6 million, of the maintenance projects along with 74%, or $84.4 million, of the domestic capital projects and 45%, or $41.6 million, of the rivers & lakes projects awarded year to date through September 30, 2012. The Company won 39% of the overall domestic bid market through September 30, 2012, which parallels the Company’s prior three year average of 39%. Variability in contract wins from quarter to quarter is not unusual and one quarter’s win rate is generally not indicative of the win rate the Company is likely to achieve for a full year.

The Company’s contracted dredging backlog was $463.2 million at September 30, 2012 compared to $319.4 million as of December 31, 2011. These amounts do not reflect approximately $62.0 million of domestic low bids pending formal award and additional phases (“options”) pending on projects currently in backlog at September 30, 2012. At December 31, 2011 the amount of domestic low bids and options pending award was $36.1 million.

Domestic capital dredging backlog at September 30, 2012 was $13.5 million less than at December 31, 2011 as progress on the Company’s capital projects in New York and Louisiana continued to convert backlog into revenue. River deepening projects in North Carolina and New Jersey were awarded during the quarter to add over $30 million to backlog. The Company anticipates a strong capital dredging bid market over the next twelve months. Several East Coast ports, including Miami, are accelerating their deepening efforts to facilitate larger draft vessels from international trade. In October 2012, the Corps began soliciting bids for the Miami harbor deepening with the expectation of an award date in the first quarter of 2013.

Beach nourishment dredging backlog at September 30, 2012 was $42.7 million lower than at December 31, 2011 as the Company finished three beach projects on the East Coast and began work renourishing beaches in Southern California. The Company was awarded projects in New York and New Jersey including a project near Ocean City that added over $15 million to backlog in the quarter and are planned to begin before year end.

Maintenance dredging backlog was $15.3 million higher at September 30, 2012 than at December 31, 2011. The Corps awarded several maintenance projects in the quarter including $24.2 million, which includes pending options, in the Baltimore harbor as well as $8.2 million to build a sill at the end of the Mississippi River to prevent saltwater from seeping upstream given the drought-lowered river levels. The Company continued work on existing projects in Louisiana and Delaware.

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Rivers & lakes backlog is $19.6 million higher at September 30, 2012 than at December 31, 2011. Rivers & lakes continued to earn on projects in its backlog, including work on the Mississippi River and its tributaries performing maintenance dredging and levee repair projects. The Corps awarded the Company several projects on the Mississippi River and its tributaries to assist in keeping the waterway navigable during the summer months when a drought throughout the Midwest lowered the level of the river. In addition, rivers & lakes was awarded a $7.7 million multi-year contract to dredge sediment in Florida that would be used in phosphate mining.

Foreign capital dredging backlog increased to $243.5 million at September 30, 2012 from December 31, 2011, due primarily to the award of the dredging contract for the Wheatstone LNG project in Western Australia. The Company will deploy the dredge New York on the Company’s portion of the project for about 27 months to complete this significant international dredging opportunity. The Company also was awarded a $47.6 million contract for another land reclamation project in the Middle East. The Company also sees additional opportunities in the Middle East, Southeast Asia and South America that it continues to pursue.

Demolition services backlog was $8.1 million lower at September 30, 2012 from December 31, 2011. New projects awarded in the nine months ended September 30, 2012 include the $22.2 million brownfield remediation project in New Jersey that was pending award at year end and four large civil site development projects that are expected each to generate over $3 million of revenue, including a new power plant project awarded in the third quarter 2012. A large portion of the backlog earned in the first nine months of 2012 relates to the new management’s focus on large complex projects such as municipal developments in New York and specialty work such as bridge demolition in Louisiana, New Hampshire and New York.

Impact of Hurricane Sandy

In the fourth quarter of 2012, Hurricane Sandy impacted the East Coast of the United States and will adversely affect the Company’s fourth quarter earnings and cash flows from operations. Although the Company cannot yet quantify the full financial effect of the event, the Company currently estimates that it will lose a total of 25 working days, in aggregate, over seven projects impacted by the storm, which required the Company to move dredges and support equipment to protected waters. The Company’s project estimates include contingencies for normal weather that could offset some of these additional costs for lost time and fixed cost coverage. Currently, management believes there was minimal damage to the Company’s operating equipment and the affected projects have been restarted quickly. The Company also experienced damage to its facilities located in the path of Hurricane Sandy, but management does not believe the losses, net of insurance recoveries, will be material in future periods. Due to the significant damage to our nation’s coastline, the Company could obtain additional future revenue on some of these projects, which if obtained could mitigate the one-time expenses on these projects.

Dredge New York litigation development

During the quarter ended March 31, 2012, a judgment in the aggregate amount of $13.3 million was rendered in the Company’s favor in its litigation regarding the dredge New York loss of use claim. The defendants are appealing the judgment and the Company cannot be assured when the appeal will be heard or predict the outcome of the appellate process. For additional information regarding this matter, see Note 9 to the Company’s condensed consolidated financial statements.

Liquidity and Capital Resources

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

The Company’s net cash provided by (used in) operating activities for the nine months ended September 30, 2012 and 2011 totaled $(39.2) million, and $13.6 million, respectively. Normal increases or decreases in the level of working capital relative to the level of operational activity impact cash flow from operating activities. In the first nine months of 2012, the increase in net cash used in operating activities was primarily the result of lower adjusted EBITDA and an increased investment in working capital as compared to the same period in the prior year. Two projects with the most significant investment are Wheatstone and the Scofield coastal restoration.

The Company’s net cash flows used in investing activities for the first nine months of 2012 and 2011 totaled $29.5 million and $17.4 million, respectively. Investing activities in both periods primarily relate to normal course upgrades and capital maintenance of the Company’s dredging fleet. During the nine months ended September 30, 2012, the Company overhauled the engines on the dredge Alaska to provide increased useful life and efficiency. This engine overhaul added $5.4 million in investing capital expenditures during the nine months ended September 30, 2012. Additionally, the Company purchased a $6.4 million storage yard during the nine months ended September 30, 2012. During the nine months ended September 30, 2011, the Company sold the dredge Victoria Island for $6.6 million of cash proceeds.

The Company’s net cash flows provided by (used in) financing activities for the nine months ended September 30, 2012 and 2011 totaled $(6.3) million and $62.8 million, respectively. The Company issued $250 million of 7.375% senior notes in the first nine months of 2011, resulting in $244.2 million of net proceeds. The Company used a portion of these net proceeds to redeem its $175 million of 7.75% senior subordinated notes in the first three months of 2011 for $180.0 million, which included a redemption premium and unpaid interest.

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The Company paid $3.7 million in dividends in the first nine months of 2012. The future declaration and payment of dividends will be at the discretion of the Company’s board of directors and will depend on many factors, including general economic and business conditions, the Company’s strategic plans, financial results and condition and legal requirements, including restrictions and limitations contained in the revolving credit facility and the indenture relating to its senior notes. Accordingly, the Company cannot make any assurances as to the size of any such dividend or that it will pay any such dividend in future quarters.

On June 4, 2012, the Company entered into a senior revolving credit agreement (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, which replaced the Company’s former revolving credit agreement, provides for a senior revolving credit facility in an aggregate principal amount of up to $175 million, subfacilities for the issuance of standby letters of credit up to a $125 million sublimit, multicurrency borrowings up to a $50 million sublimit and swingline loans up to a $10 million 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 $50 million. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, the Company will be in pro forma compliance with the existing financial covenants both before and after giving effect to the increase and other standard conditions. The prior credit agreement with Bank of America N.A. was terminated.

Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company of 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 revolving credit facility is an unsecured facility and will remain unsecured provided the Company maintains a total leverage ratio less than or equal to 3.75 to 1.00 as of the end of each fiscal quarter. If the leverage ratio exceeds 3.75 to 1.00, or an event of default occurs and is not cured within the applicable grace period, the revolving credit facility will cease to remain unsecured. In the event of the facility becomes secured, outstanding obligations shall be automatically secured by certain vessels and all domestic accounts receivable, subject to the liens and interests of other parties (including the Company’s bonding provider) holding first priority perfected liens.

The new credit facility 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 Company’s obligations under its international letter of credit facility are secured by the Company’s foreign accounts receivable. The Company’s obligations under its senior notes are unsecured. The Company’s material agreements related to long term debt contain various restrictive covenants, including limitations on dividends, redemption and repurchases of capital stock, and the incurrence of indebtedness and requirements to maintain certain financial covenants. The Company is in compliance with its various covenants under the respective agreements as of September 30, 2012.

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

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

Critical Accounting Policies and Estimates

In preparing its consolidated financial statements, the Company follows accounting principles generally accepted in the United States of America. The application of these principles requires significant judgments or an estimation process that can affect the results of operations, financial position and cash flows of the Company, as well as the related footnote disclosures. The Company continually reviews its accounting policies and financial information disclosures. There have been no material changes in the Company’s critical accounting policies or estimates since December 31, 2011.

32

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

The market risk of the Company’s financial instruments as of September 30, 2012 has not materially changed since December 31, 2011. The market risk profile of the Company on December 31, 2011 is disclosed in Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” of the Company’s Annual Report on Form 10-K for the year ended December 31, 2011.

33

Item 4. Controls and Procedures.

a) Evaluation of disclosure controls and procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures, as required by Rule 13a-15(b) and 15d-15(b) under the Securities Exchange Act of 1934 (the “Exchange Act”) as of September 30, 2012. Our disclosure controls and procedures are designed to reasonably assure that information required to be disclosed by us in reports we file or submit under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding disclosure and is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

Our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective in providing such reasonable assurance.

b) Changes in internal control over financial reporting.

There have been no changes in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) during the fiscal quarter ended September 30, 2012 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

34

PART II — Other Information

Item 1. Legal Proceedings.

See Note 9 “Commitments and Contingencies” in the Notes to Condensed Consolidated Financial Statements.

Item 1A. Risk Factors.

There have been no material changes during the nine months ended September 30, 2012 to the risk factors previously disclosed in Item 1A. Risk Factors in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011.

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

(a) None.

(b) None.

(c) None.

Item 3. Defaults Upon Senior Securities.

(a) None.

(b) None.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information

(a) None.

(b) Not applicable.

35

Item 6. Exhibits

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

* Filed herewith.

36

SIGNATURE

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

Great Lakes Dredge & Dock Corporation
(registrant)
By:	/s/ WILLIAM S. STECKEL
	William S. Steckel
	Senior Vice President and Chief Financial Officer
	(Principal Financial and Accounting Officer and Duly Authorized Officer)

Date: November 7, 2012

37

EXHIBIT INDEX

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

* Filed herewith.

38

EX-31.1

Exhibit 31.1

CERTIFICATIONS PURSUANT TO

SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

CERTIFICATION

I, Jonathan W. Berger, certify that:

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

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

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

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

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

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

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

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

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

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

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

Date: November 7, 2012

/s/ Jonathan W. Berger

Jonathan W. Berger

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS PURSUANT TO

SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

CERTIFICATION

I, William S. Steckel, certify that:

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

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

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

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

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

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

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

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

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

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

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

Date: November 7, 2012

/s/ William S. Steckel

William S. Steckel

Senior Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Great Lakes Dredge & Dock Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2012, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jonathan W. Berger, Chief Executive Officer of the Registrant, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

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

/s/ Jonathan W. Berger

Jonathan W. Berger

Chief Executive Officer

Date: November 7, 2012

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

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Great Lakes Dredge & Dock Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2012, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, William S. Steckel, Senior Vice President and Chief Financial Officer, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

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

/s/ William S. Steckel

William S. Steckel

Senior Vice President and Chief Financial Officer

Date: November 7, 2012

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

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Acquisition Of Noncontrolling Interest (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended	9 Months Ended
	Apr. 29, 2011	Mar. 31, 2011	Sep. 30, 2011	Jan. 02, 2011	Dec. 31, 2010
Acquisition Of Noncontrolling Interest [Abstract]
Owned profits interests				100.00%	65.00%
Reacquired membership interest					35.00%
Acquisition of Noncontrolling Interest		$ 1,973	$ 1,933
Adjustment of noncontrolling interests	$ 1,933

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Fair Value Measurements (Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivative asset, fair value, net,	$ 430	$ 1,359
Derivative asset, fair value, gross liability	472
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Current Assets [Member]
Derivative asset, fair value, gross asset	430	755
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivative asset, fair value, gross asset		155
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued Liabilities [Member]
Derivative asset, fair value, gross liability	13
Fuel Hedge Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivative asset, fair value, gross asset		449
Fuel Hedge Contracts [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivative asset, fair value, gross liability	$ 459

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Subsidiary Guarantors (Tables)

9 Months Ended

Sep. 30, 2012

Sep. 30, 2011

Subsidiary Guarantors [Abstract]

Condensed Consolidating of Balance Sheet

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF SEPTEMBER 30, 2012
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	38,157	$	167	$	-	$	-	$	38,324
Accounts receivable — net		133,369		875		-		-		134,244
Receivables from affiliates		71,773		8,466		7,443		(87,682)		-
Contract revenues in excess of billings		62,213		206		-		(273)		62,146
Inventories		36,511		-		-		-		36,511
Prepaid expenses and other current assets		40,433		30		10,536		-		50,999
Total current assets		382,456		9,744		17,979		(87,955)		322,224
PROPERTY AND EQUIPMENT—Net		313,338		45		-		-		313,383
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,317		349		-		-		98,666
INVENTORIES — Noncurrent		37,354		-		-		-		37,354
INVESTMENTS IN JOINT VENTURES		7,076		-		-		-		7,076
INVESTMENTS IN SUBSIDIARIES		3,359		-		649,387		(652,746)		-
OTHER		11,351		3		6,629		-		17,983
TOTAL	$	853,251	$	10,141	$	673,995	$	(740,701)	$	796,686
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	91,308	$	711	$	-	$	-	$	92,019
Payables to affiliates		61,980		3,925		21,926		(87,831)		-
Accrued expenses		19,707		833		3,365		-		23,905
Billings in excess of contract revenues		20,808		133		-		(124)		20,817
Current portion of long term debt		2,587		-		-		-		2,587
Total current liabilities		196,390		5,602		25,291		(87,955)		139,328
LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		172		-		104,177		-		104,349
OTHER		5,982		-		775		-		6,757
Total liabilities		205,044		5,602		380,243		(87,955)		502,934
Total Great Lakes Dredge & Dock Corporation Equity		648,207		4,539		293,543		(652,746)		293,543
NONCONTROLLING INTERESTS		-		-		209		-		209
TOTAL EQUITY		648,207		4,539		293,752		(652,746)		293,752
TOTAL	$	853,251	$	10,141	$	673,995	$	(740,701)	$	796,686

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2011
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	108,985	$	4,303	$	-	$	-	$	113,288
Accounts receivable — net		118,530		1,738		-		-		120,268
Receivables from affiliates		79,683		7,729		49,724		(137,136)		-
Contract revenues in excess of billings		26,323		153		-		(64)		26,412
Inventories		33,426		-		-		-		33,426
Prepaid expenses and other current assets		15,929		125		16,330		-		32,384
Total current assets		382,876		14,048		66,054		(137,200)		325,778
PROPERTY AND EQUIPMENT—Net		310,459		61		-		-		310,520
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,474		389		-		-		98,863
INVENTORIES — Noncurrent		30,103		-		-		-		30,103
INVESTMENTS IN JOINT VENTURES		6,923		-		-		-		6,923
INVESTMENTS IN SUBSIDIARIES		4,385		-		627,754		(632,139)		-
OTHER		10,729		3		5,547		(6)		16,273
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	81,971	$	774	$	-	$	-	$	82,745
Payables to affiliates		85,865		7,234		44,053		(137,152)		-
Accrued expenses		22,445		629		8,047		-		31,121
Billings in excess of contract revenues		13,607		68		-		(48)		13,627
Current portion of long term debt		3,033		-		-		-		3,033
Total current liabilities		206,921		8,705		52,100		(137,200)		130,526
LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		399		-		103,959		(6)		104,352
OTHER		7,786		-		759		-		8,545
Total liabilities		217,606		8,705		406,818		(137,206)		495,923
Total Great Lakes Dredge & Dock Corporation Equity		626,343		5,796		291,969		(632,139)		291,969
NONCONTROLLING INTERESTS		-		-		568		-		568
TOTAL EQUITY		626,343		5,796		292,537		(632,139)		292,537
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460

Condensed Consolidating of Operations and Comprehensive Income

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	165,999	$	2,300	$	-	$	(1,536)	$	166,763
Costs of contract revenues		(153,011)		(2,268)		-		1,536		(153,743)
Gross profit		12,988		32		-		-		13,020
OPERATING EXPENSES:
General and administrative expenses		10,901		192		574		-		11,667
Gain on sale of assets—net		(192)		-		84		-		(108)
Operating income (loss)		2,279		(160)		(658)		-		1,461
Interest expense—net		(96)		(36)		(4,973)		-		(5,105)
Equity in earnings (loss) of subsidiaries		(37)		-		3,585		(3,548)		-
Equity in earnings of joint ventures		177		-		-		-		177
Loss on foreign currency transactions—net		(40)		-		-		-		(40)
Income (loss) before income taxes		2,283		(196)		(2,046)		(3,548)		(3,507)
Income tax (provision) benefit		1,461		-		(106)		-		1,355
Net income (loss)		3,744		(196)		(2,152)		(3,548)		(2,152)
Net loss attributable to noncontrolling interests		-		-		20		-		20
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	3,744	$	(196)	$	(2,132)	$	(3,548)	$	(2,132)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	4,486	$	(196)	$	(1,390)	$	(4,290)	$	(1,390)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2011
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	155,426	$	6,796	$	-	$	(3,754)	$	158,468
Costs of contract revenues		(127,306)		(7,525)		-		3,754		(131,077)
Gross profit		28,120		(729)		-		-		27,391
OPERATING EXPENSES:
General and administrative expenses		11,630		214		892		-		12,736
Gain on sale of assets—net		(131)		-		-		-		(131)
Operating income (loss)		16,621		(943)		(892)		-		14,786
Interest expense—net		(450)		(61)		(5,060)		-		(5,571)
Equity in earnings (loss) of subsidiaries		208		-		14,864		(15,072)		-
Equity in earnings of joint ventures		606		-		-		-		606
Loss on foreign currency transactions, net		(526)		(18)		-		-		(544)
Income (loss) before income taxes		16,459		(1,022)		8,912		(15,072)		9,277
Income tax (provision) benefit		(365)		-		(3,253)		-		(3,618)
Net income (loss)		16,094		(1,022)		5,659		(15,072)		5,659
Net income attributable to noncontrolling interests		-		-		(57)		-		(57)
Net income (loss) attributable to Great Lakes  Dredge & Dock Corporation	$	16,094	$	(1,022)	$	5,602	$	(15,072)	$	5,602
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	15,190	$	(1,022)	$	4,698	$	(14,168)	$	4,698

Condensed Consolidating of Cash Flows

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(9,782)	$	57	$	(29,485)	$	-	$	(39,210)
INVESTING ACTIVITIES:
Purchases of property and equipment		(30,015)		-		-		-		(30,015)
Proceeds from dispositions of property and equipment		563		-		-		-		563
Net cash flows used in investing activities		(29,452)		-		-		-		(29,452)
FINANCING ACTIVITIES:
Deferred financing fees		-		-		(2,039)		-		(2,039)
Distributions paid to minority interests		-		-		(133)		-		(133)
Dividends paid		-		-		(3,726)		-		(3,726)
Dividend equivalents paid on restricted stock units		-		-		(39)		-		(39)
Taxes paid on settlement of vested share awards		-		-		(212)		-		(212)
Net change in accounts with affiliates		(31,092)		(4,203)		35,295		-		-
Repayments of equipment debt		(502)		-		-		-		(502)
Exercise of stock options		-		-		200		-		200
Excess income tax benefit from share-based compensation		-		-		139		-		139
Net cash flows provided by (used in) financing activities		(31,594)		(4,203)		29,485		-		(6,312)
Effect of foreign currency exchange rates on cash and cash equivalents		-		10		-		-		10
Net decrease in cash and cash equivalents		(70,828)		(4,136)		-		-		(74,964)
Cash and cash equivalents at beginning of period		108,985		4,303		-		-		113,288
Cash and cash equivalents at end of period	$	38,157	$	167	$	-	$	-	$	38,324

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2011
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	41,250	$	(640)	$	(26,984)	$	-	$	13,626
INVESTING ACTIVITIES:
Purchases of property and equipment		(24,894)		(7)		-		-		(24,901)
Proceeds from dispositions of property and equipment		7,452		-		-		-		7,452
Net cash flows used in investing activities		(17,442)		(7)		-		-		(17,449)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		-		-		250,000		-		250,000
Redemption of 7 3/4% senior subordinated notes		-		-		(175,000)		-		(175,000)
Senior subordinated notes redemption premium		-		-		(2,264)		-		(2,264)
Deferred financing fees		-		-		(5,962)		-		(5,962)
Dividends paid		-		-		(3,473)		-		(3,473)
Dividend equivalents paid on restricted stock units		-		-		(20)		-		(20)
Taxes paid on vested share awards		-		-		(291)				(291)
Net change in accounts with affiliates		33,524		2,557		(36,081)		-		-
Capital contributions		(3,205)		3,205		-		-		-
Repayments of equipment debt		(274)		-		-		-		(274)
Exercise of stock options		-		-		27		-		27
Excess income tax benefit from share-based compensation		-		-		48		-		48
Net cash flows provided by financing activities		30,045		5,762		26,984		-		62,791
Effect of foreign currency exchange rates on cash and cash equivalents		-		(396)		-		-		(396)
Net increase in cash and cash equivalents		53,853		4,719		-		-		58,572
Cash and cash equivalents at beginning of period		48,416		62		-		-		48,478
Cash and cash equivalents at end of period	$	102,269	$	4,781	$	-	$	-	$	107,050

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Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Contract revenues	$ 166,763	$ 158,468	$ 488,202	$ 468,765
Costs of contract revenues	(153,743)	(131,077)	(431,271)	(394,166)
Gross profit	13,020	27,391	56,931	74,599
General and administrative expenses	11,667	12,736	36,390	38,447
Gain on sale of assets-net	(108)	(131)	(232)	(2,902)
Operating income	1,461	14,786	20,773	39,054
Interest expense-net	(5,105)	(5,571)	(15,747)	(16,432)
Equity in loss of joint ventures	177	606	153	(108)
Loss on foreign currency transactions-net	(40)	(544)	(55)	(544)
Loss on extinguishment of debt				(5,145)
Income before income taxes	(3,507)	9,277	5,124	16,825
Income tax (provision) benefits	1,355	(3,618)	(1,977)	(6,600)
Net income	(2,152)	5,659	3,147	10,225
Net loss attributable to noncontrolling interests	20	(57)	226	(525)
Net income attributable to Great Lakes Dredge & Dock Corporation	(2,132)	5,602	3,373	9,700
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(1,390)	4,698	2,823
GLDD Corporation [Member]
General and administrative expenses	574	892	1,701	2,456
Gain on sale of assets-net	84		95
Operating income	(658)	(892)	(1,796)	(2,456)
Interest expense-net	(4,973)	(5,060)	(15,026)	(15,693)
Equity in earnings (loss) of subsidiaries	3,585	14,864	22,282	42,982
Loss on extinguishment of debt				(5,145)
Income before income taxes	(2,046)	8,912	5,460	19,688
Income tax (provision) benefits	(106)	(3,253)	(2,313)	(9,463)
Net income	(2,152)	5,659	3,147	10,225
Net loss attributable to noncontrolling interests	20	(57)	226	(525)
Net income attributable to Great Lakes Dredge & Dock Corporation	(2,132)	5,602	3,373	9,700
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(1,390)	4,698	2,823
Subsidiary Guarantors [Member]
Contract revenues	165,999	155,426	487,910	460,688
Costs of contract revenues	(153,011)	(127,306)	(430,493)	(387,094)
Gross profit	12,988	28,120	57,417	73,594
General and administrative expenses	10,901	11,630	34,149	35,356
Gain on sale of assets-net	(192)	(131)	(327)	(2,902)
Operating income	2,279	16,621	23,595	41,140
Interest expense-net	(96)	(450)	(634)	(579)
Equity in earnings (loss) of subsidiaries	(37)	208	(639)	1,422
Equity in loss of joint ventures	177	606	153	(108)
Loss on foreign currency transactions-net	(40)	(526)	(55)
Income before income taxes	2,283	16,459	22,420	41,349
Income tax (provision) benefits	1,461	(365)	336	2,863
Net income	3,744	16,094	22,756	44,212
Net income attributable to Great Lakes Dredge & Dock Corporation	3,744	16,094	22,756	44,212
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	4,486	15,190	22,210
Non-Guarantor Subsidiaries [Member]
Contract revenues	2,300	6,796	6,350	16,382
Costs of contract revenues	(2,268)	(7,525)	(6,836)	(15,377)
Gross profit	32	(729)	(486)	1,005
General and administrative expenses	192	214	540	635
Operating income	(160)	(943)	(1,026)	370
Interest expense-net	(36)	(61)	(87)	(160)
Loss on foreign currency transactions-net		(18)
Income before income taxes	(196)	(1,022)	(1,113)	192
Net income	(196)	(1,022)	(1,113)	192
Net income attributable to Great Lakes Dredge & Dock Corporation	(196)	(1,022)	(1,113)	192
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(196)	(1,022)	(1,117)
Eliminations [Member]
Contract revenues	(1,536)	(3,754)	(6,058)	(8,305)
Costs of contract revenues	1,536	3,754	6,058	8,305
Equity in earnings (loss) of subsidiaries	(3,548)	(15,072)	(21,643)	(44,404)
Income before income taxes	(3,548)	(15,072)	(21,643)	(44,404)
Net income	(3,548)	(15,072)	(21,643)	(44,404)
Net income attributable to Great Lakes Dredge & Dock Corporation	(3,548)	(15,072)	(21,643)	(44,404)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$ (4,290)	$ (14,168)	$ (21,093)

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Contract revenues	$ 166,763	$ 158,468	$ 488,202	$ 468,765
Operating income (loss)	1,461	14,786	20,773	39,054
Foreign [Member]
Contract revenues	36,329	21,843	75,202	59,779
Dredging [Member]
Contract revenues	138,811	134,591	395,944	396,273
Operating income (loss)	2,687	13,593	20,560	45,008
Segment reporting information, intersegment revenue			1,374
Demolition [Member]
Contract revenues	27,952	23,877	92,258	72,492
Operating income (loss)	(1,226)	1,193	213	(5,954)
Segment reporting information, intersegment revenue			$ 75

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Basis Of Presentation

9 Months Ended

Sep. 30, 2012

Basis Of Presentation [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, 2011. 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 September 30, 2012, and its results of operations for the three and nine months ended September 30, 2012 and 2011 and cash flows for the nine months ended September 30, 2012 and 2011have been included.

The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel 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. Generally, capital projects have the highest margins due to the complexity of the projects, while beach nourishment projects have the most volatile margins because they are most often exposed to variability in weather conditions.

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% to 25% 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 thesefixed 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 annualrevenues 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 operates in two reportable segments: dredging and demolition. These reportable segments are the Company’s operating segments and the reporting units at which the Company tests goodwill for impairment. The Company performed its most recent annual test of impairment as of July 1, 2012 for the goodwill in both the dredging and demolition segments with no indication of goodwill impairment as of the test date. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2013.  

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.

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Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 3,147	$ 10,225
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	26,637	29,999
Equity in loss of joint ventures	(153)	108
Loss on extinguishment of 7 3/4% senior subordinated notes		5,145
Deferred income taxes	1,386	8,793
Gain on dispositions of property and equipment	(232)	(2,902)
Amortization of deferred financing fees	957	1,181
Unrealized foreign currency gain	207	525
Share-based compensation expense	2,389	1,224
Excess income tax benefit from share based compensation	(139)	(48)
Changes in assets and liabilities:
Accounts receivable	(16,260)	(13,279)
Inventories	(10,616)	(4,524)
Prepaid expenses and other current assets	(16,027)	(11,641)
Accounts payable and accrued expenses	(1,733)	(9,027)
Net cash flows used in operating activities	(39,210)	13,626
INVESTING ACTIVITIES:
Purchases of property and equipment	(30,015)	(24,901)
Proceeds from dispositions of property and equipment	563	7,452
Net cash flows used in investing activities	(29,452)	(17,449)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,962)
Distribution made to member or limited partner, cash distributions paid	(133)
Dividends paid	(3,726)	(3,473)
Dividend equivalents paid on restricted stock units	(39)	(20)
Taxes paid on settlement of vested share awards	(212)	(291)
Repayments of equipment debt	(502)	(274)
Exercise of stock options	200	27
Excess income tax benefit from share-based compensation	139	48
Net cash flows provided by (used in) financing activities	(6,312)	62,791
Effect of foreign currency exchange rates on cash and cash equivalents	10	(396)
Net increase (decrease) in cash and cash equivalents	(74,964)	58,572
Cash and cash equivalents at beginning of period	113,288	48,478
Cash and cash equivalents at end of period	38,324	107,050
Supplemental Cash Flow Information
Cash paid for interest	19,051	12,714
Cash paid (refunded) for income taxes	(4,840)	5,282
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	7,693	3,366
Acquisition of noncontrolling interest in NASDI, LLC		40
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net income	3,147	10,225
Adjustments to reconcile net income to net cash flows used in operating activities:
Loss on extinguishment of 7 3/4% senior subordinated notes		5,145
Changes in assets and liabilities:
Net cash flows used in operating activities	(29,485)	(26,984)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,962)
Distribution made to member or limited partner, cash distributions paid	(133)
Dividends paid	(3,726)	(3,473)
Dividend equivalents paid on restricted stock units	(39)	(20)
Taxes paid on settlement of vested share awards	(212)	(291)
Net change in account with affiliate	35,295	36,081
Exercise of stock options	200	27
Excess income tax benefit from share-based compensation	139	48
Net cash flows provided by (used in) financing activities	29,485	26,984
Subsidiary Guarantors [Member]
OPERATING ACTIVITIES:
Net income	22,756	44,212
Adjustments to reconcile net income to net cash flows used in operating activities:
Equity in loss of joint ventures	(153)	108
Changes in assets and liabilities:
Net cash flows used in operating activities	(9,782)	41,250
INVESTING ACTIVITIES:
Purchases of property and equipment	(30,015)	(24,894)
Proceeds from dispositions of property and equipment	563	7,452
Net cash flows used in investing activities	(29,452)	(17,442)
FINANCING ACTIVITIES:
Net change in account with affiliate	(31,092)	(33,524)
Capital contributions		(3,205)
Repayments of equipment debt	(502)	(274)
Net cash flows provided by (used in) financing activities	(31,594)	30,045
Net increase (decrease) in cash and cash equivalents	(70,828)	53,853
Cash and cash equivalents at beginning of period	108,985	48,416
Cash and cash equivalents at end of period	38,157	102,269
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net income	(1,113)	192
Changes in assets and liabilities:
Net cash flows used in operating activities	57	(640)
INVESTING ACTIVITIES:
Purchases of property and equipment		(7)
Net cash flows used in investing activities		(7)
FINANCING ACTIVITIES:
Net change in account with affiliate	(4,203)	(2,557)
Capital contributions		3,205
Net cash flows provided by (used in) financing activities	(4,203)	5,762
Effect of foreign currency exchange rates on cash and cash equivalents	10
Net increase (decrease) in cash and cash equivalents	(4,136)	4,719
Cash and cash equivalents at beginning of period	4,303	62
Cash and cash equivalents at end of period	167	4,781
Eliminations [Member]
OPERATING ACTIVITIES:
Net income	$ (21,643)	$ (44,404)

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Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Costs and earnings in excess of billings on contracts in progress	$ 58,785	$ 21,142
Costs and earnings in excess of billings for completed contracts	3,361	7,459
Total contract revenues in excess of billings	62,146	28,601
Current portion of contract revenues in excess of billings	62,146	26,412
Portion included in other noncurrent assets		2,189
Total billings in excess of contract revenues	(20,817)	(13,627)
Costs And Earnings In Excess Of Billings [Member]
Costs and earnings for contracts in progress	333,058	173,187
Amounts billed	(274,273)	(152,045)
Billings In Excess Of Costs And Earnings [Member]
Costs and earnings for contracts in progress	430,751	414,170
Amounts billed	$ (451,568)	$ (427,797)

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Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts Receivable [Line Items]
Retainage	$ 21,788	$ 20,692
Accounts Receivable, Gross	143,578	128,478
Allowance for doubtful accounts	(750)	(1,839)
Total accounts receivable	142,828	126,639
Current portion of accounts receivable-net	134,244	120,268
Long-term accounts receivable and retainage	8,584	6,371
Completed Contracts [Member]
Accounts Receivable [Line Items]
Contracts	27,119	38,317
Contracts In Progress [Member]
Accounts Receivable [Line Items]
Contracts	$ 94,671	$ 69,469

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Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011	Jan. 31, 2011	May 31, 2009
Derivative asset, notional amount											$ 50,000,000
Derivative, average fixed interest rate											7.75%
Derivative underlying hedge percent	80.00%				80.00%
Derivative, nonmonetary notional amount	5,000,000				5,000,000
Senior Notes	250,000,000				250,000,000				250,000,000	250,000,000
Reclassification of derivative gain (loss) to earnings	(85,000)	[1]	(183,000)	[1]	(348,000)	[1]	(1,250,000)	[1]
Fair value hedge liabilities	459,000				459,000
Fair value hedge assets									449,000
Senior notes interest rate	7.375%				7.375%					7.375%
Maximum [Member]
Fixed price range	3.29				3.29
Minimum [Member]
Fixed price range	2.86				2.86
Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Senior Notes	$ 263,750,000				$ 263,750,000

[1] Net of income tax expense of $56 and $295 for the three months ended September 30, 2012 and 2011, respectively, and $231 and $830 for the nine months ended September 30, 2012 and 2011, respectively.

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Fair Value Measurements (Fair Value Measurements at Reporting Date Using) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets, fair value disclosure		$ 1,359
Liabilities, fair value disclosure	472
Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		1,359
Liabilities, fair value disclosure	472
Fuel Hedge Contracts [Member]
Assets, fair value disclosure		449
Liabilities, fair value disclosure	459
Fuel Hedge Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		449
Liabilities, fair value disclosure	459
Foreign Exchange Contract [Member]
Assets, fair value disclosure		155
Liabilities, fair value disclosure	13
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		155
Liabilities, fair value disclosure	13
Interest Rate Contract [Member]
Assets, fair value disclosure	430	755
Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure	$ 430	$ 755

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Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 3,147	$ 10,225
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	26,637	29,999
Equity in loss of joint ventures	(153)	108
Loss on extinguishment of 7 3/4% senior subordinated notes		5,145
Deferred income taxes	1,386	8,793
Gain on dispositions of property and equipment	(232)	(2,902)
Gain on adjustment of contingent earnout	(240)	(1,122)
Amortization of deferred financing fees	957	1,181
Unrealized foreign currency gain	207	525
Share-based compensation expense	2,389	1,224
Excess income tax benefit from share based compensation	(139)	(48)
Changes in assets and liabilities:
Accounts receivable	(16,260)	(13,279)
Contract revenues in excess of billings	(33,545)	(893)
Inventories	(10,616)	(4,524)
Prepaid expenses and other current assets	(16,027)	(11,641)
Accounts payable and accrued expenses	(1,733)	(9,027)
Billings in excess of contract revenues	7,189	728
Other noncurrent assets and liabilities	(2,177)	(866)
Net cash flows used in operating activities	(39,210)	13,626
INVESTING ACTIVITIES:
Purchases of property and equipment	(30,015)	(24,901)
Proceeds from dispositions of property and equipment	563	7,452
Net cash flows used in investing activities	(29,452)	(17,449)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,962)
Distribution made to member or limited partner, cash distributions paid	(133)
Dividends paid	(3,726)	(3,473)
Dividend equivalents paid on restricted stock units	(39)	(20)
Taxes paid on settlement of vested share awards	(212)	(291)
Repayments of equipment debt	(502)	(274)
Exercise of stock options	200	27
Excess income tax benefit from share-based compensation	139	48
Net cash flows provided by (used in) financing activities	(6,312)	62,791
Effect of foreign currency exchange rates on cash and cash equivalents	10	(396)
Net increase (decrease) in cash and cash equivalents	(74,964)	58,572
Cash and cash equivalents at beginning of period	113,288	48,478
Cash and cash equivalents at end of period	38,324	107,050
Supplemental Cash Flow Information
Cash paid for interest	19,051	12,714
Cash paid (refunded) for income taxes	(4,840)	5,282
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	7,693	3,366
Prpoerty and equipment purchase on capital leases and equipment notes		2,085
Acquisition of noncontrolling interest in NASDI, LLC		$ 40

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Fair Value Measurements (Fair Value Measurements Using Significant Unobservable) (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Mar. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Beginning Balance		$ 1,264	$ 1,141
Fair value, measurement with unobservable inputs reconciliation, recurring basis, gain (loss) included in other comprehensive income (Loss)	57	(511)
Settlement		445
Ending Balance	$ 1,198	$ 1,198	$ 1,141

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Subsidiary Guarantors (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Jan. 31, 2011
Subsidiary Guarantors [Abstract]
Senior Notes	$ 250,000	$ 250,000	$ 250,000
Senior notes interest rate	7.375%		7.375%

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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 38,324	$ 113,288
Accounts receivable - net	134,244	120,268
Contract revenues in excess of billings	62,146	26,412
Inventories	36,511	33,426
Prepaid expenses and other current assets	50,999	32,384
Total current assets	322,224	325,778
Property and equipment - net	313,383	310,520
Goodwill and other intangiable assets - net	98,666	98,863
Inventories- noncurrent	37,354	30,103
Investments in joint ventures	7,076	6,923
Other	17,983	16,273
Total	796,686	788,460
LIABILITIES AND EQUITY
Accounts payable	92,019	82,745
Accrued expenses	23,905	31,121
Billings in excess of contract revenues	20,817	13,627
Current portion of long term debt	2,587	3,033
Total current liabilities	139,328	130,526
Long term note payable	2,500	2,500
7 3/8% Senior notes	250,000	250,000
Deferred income taxes	104,349	104,352
OTHER	6,757	8,545
Total liabilities	502,934	495,923
EQUITY:
Common stock-$.0001 par value; 90,000,000 authorized, 59,110,847 and 58,999,404 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively.	6	6
Additional paid-in capital	270,434	267,918
Retained earnings	23,650	24,042
Accumulated other comprehensive income	(547)	3
Total Great Lakes Dredge & Dock Corporation Equity	293,543	291,969
Noncontrolling interests	209	568
Total equity	293,752	292,537
TOTAL	$ 796,686	$ 788,460

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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ 0	$ 0	$ (3)	$ 0
Reclassification of derivative gains to earnings, tax	(56)	(295)	(231)	(830)
Change in fair value of derivatives, tax	$ 549	$ (246)	$ (132)	$ (313)

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Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Jun. 04, 2012
Total leverage ratio	3.75
Leverage ratio exceeds	3.75
Standby Letters of Credit [Member]
Line of credit facility, maximum borrowing capacity		$ 125,000
Revolving Credit Facility [Member]
Line of credit facility, maximum borrowing capacity		175,000
Line of credit facility optional increase capacity		50,000
Revolving credit facility, interest rate description	Depending on the Company's consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company of 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]
Line of credit facility, maximum borrowing capacity		50,000
Swingline Loans [Member]
Line of credit facility, maximum borrowing capacity		$ 10,000
Maximum [Member] | LIBOR Rate [Member] | Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	2.50%
Maximum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	1.50%
Minimum [Member] | LIBOR Rate [Member] | Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	1.50%
Minimum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	0.50%

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measurements [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value

				Fair Value Measurements at Reporting Date Using
Description	At September 30,  2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Interest rate swap contracts	$	430	$	-	$	430	$	-
Liabilities
Fuel hedge contracts	$	459	$		$	459	$
Foreign exchange contracts		13		-		13		-
Total liabilities measured at fair value	$	472	$	-	$	472	$	-
				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	449	$	-	$	449	$	-
Interest rate swap contracts		755		-		755		-
Foreign exchange contracts		155		-		155		-
Total assets measured at fair value	$	1,359	$	-	$	1,359	$	-

Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2011
Interest rate swap contracts
Balance at January 1	$	1,264
Total unrealized gains (losses) included in earnings		(511)
Settlements		445
Balance at September 30	$	1,198
Balance at July 1	$	1,141
Total unrealized gains (losses) included in earnings		57
Settlements		-
Balance at September 30	$	1,198

Schedule Fair Value Measurements Balance Sheet Location

	Balance Sheet Location	Fair Value at
		September 30,		December 31,
Asset derivatives:		2012		2011
Derivatives designated as hedges
Fuel hedge contracts	Other current assets	$	-	$	449
Derivatives not designated as hedges
Interest rate swaps	Other current assets		430		755
Foreign exchange contracts	Other current assets		-		155
Total asset derivatives		$	430	$	1,359
Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	459	$	-
Derivatives not designated as hedges
Foreign exchange contracts	Accrued expenses		13		-
Total liability derivatives		$	472	$	-

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Share Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2007
Share-based compensation arrangement by share-based payment award, number of shares available for grant					5,800,000
Allocated share-based compensation expense	$ 675	$ 381	$ 2,389	$ 1,224
Stock Options [Member]
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	497,000
Restricted Stock [Member]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period	273,000

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2012

Segment Information [Abstract]

Segment Information

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Dredging
Contract revenues	$	138,811	$	134,591	$	395,944	$	396,273
Operating income		2,687		13,593		20,560		45,008
Demolition
Contract revenues	$	27,952	$	23,877	$	92,258	$	72,492
Operating income (loss)		(1,226)		1,193		213		(5,954)
Total
Contract revenues	$	166,763	$	158,468	$	488,202	$	468,765
Operating income		1,461		14,786		20,773		39,054

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Condensed Consolidated Statements Of Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss)[Member]	Noncontrolling Interests [Member]	Total
Balance - value at Dec. 31, 2010	$ 6	$ 266,329	$ 12,261	$ 357	$ (2,128)	$ 276,825
Balance - shares at Dec. 31, 2010	58,770,369
Share-based compensation, Value		1,224				1,224
Share-based compensation, Shares	77,369
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(291)				(291)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	106,428
Exercise of stock options, Value		27				27
Exercise of stock options, Shares	6,278
Dividends declared and paid			(3,473)			(3,473)
Dividend equivalents paid on restricted stock units			(20)			(20)
Excess income tax benefit from share based compensation		48				48
Acquisition of noncontrolling interest in NASDI, LLC		(40)			1,973	1,933
Net income			9,700		525	10,225
Other comprehensive income-net of tax				(1,152)		(1,152)
Balance - value at Sep. 30, 2011	6	267,297	18,468	(795)	370	285,346
Balance - shares at Sep. 30, 2011	58,960,444
Balance - value at Dec. 31, 2011	6	267,918	24,042	3	568	292,537
Balance - shares at Dec. 31, 2011	58,999,404
Share-based compensation, Value		2,389				2,389
Share-based compensation, Shares	145,349
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(212)				(212)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	81,640
Exercise of stock options, Value		200				200
Exercise of stock options, Shares	48,000
Dividends declared and paid			(3,726)			(3,726)
Dividend equivalents paid on restricted stock units			39			39
Distributions paid to noncontrolling interests					(133)	(133)
Excess income tax benefit from share based compensation		139				139
Net income			3,373		(226)	3,147
Other comprehensive income-net of tax				(550)		(550)
Balance - value at Sep. 30, 2012	$ 6	$ 270,434	$ 23,650	$ (547)	$ 209	$ 293,752
Balance - shares at Sep. 30, 2012	59,274,393

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	59,274,393	58,999,404
Common stock, shares outstanding	59,274,393	58,999,404

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Commitments And Contingencies

9 Months Ended

Sep. 30, 2012

Commitments And Contingencies [Abstract]

Commitments And Contingencies

9.   Commitments and contingencies

Commercial commitments

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. As of September 30, 2012, the Company had no borrowings and $33,252of letters of credit outstanding, resulting in $141,748of availability under the Credit Agreement. At September 30, 2012, the Company was in compliance with its various covenants under its Credit Agreement.

Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some demolition projects. In September 2011, the Company entered into a bonding agreement with Zurich American Insurance Company (“Zurich”) under which the Company can obtain performance, bid and payment bonds. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At September 30, 2012, the Company had outstanding performance bonds valued at approximately $457,924; however, the revenue value remaining in backlog related to these projects totaled approximately $133,252.  

The Company has a $24,000 international letter of credit facility that it uses for the performance and advance payment guarantees on the Company’s foreign contracts. As of September 30, 2012, Great Lakes had no of letters of credit outstanding under this facility. At September 30, 2012, the Company also had $250,000 of 7.375% senior notes outstanding, which mature in February 2019.  

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.

The Company or its former subsidiary, NATCO Limited Partnership, was named as a defendant in approximately 251 asbestos-related personal injury lawsuits, the majority of which were filed between 1989 and 2000. The claims were filed on behalf of seamen or their personal representatives alleging injury or illness from exposure to asbestos while employed as seamen on Company-owned vessels. In these cases, the Company is typically one of many defendants, including manufacturers and suppliers of products containing asbestos, as well as other vessel owners. Following certain administrative proceedings, counsel for plaintiffs agreed to name a group of cases that they intended to pursue and to dismiss the remaining cases without prejudice. Plaintiffs previously named 40 cases against the Company that they intended to pursue, each of which involves one plaintiff. The remaining cases against the Company were dismissed without prejudice. Plaintiffs in the dismissed cases could file a new lawsuit if they develop a new disease allegedly caused by exposure to asbestos on board our vessels. Of the 40 named cases, three were subsequently dismissed, leaving 37 cases remaining. The Company is presently unable to quantify the amounts of damages being sought in the remaining lawsuits because none of the complaints specify a damage amount. Based on preliminary discovery and settlement demands received to date, the Company does not believe that it is probable that losses from these claims could be material, and an estimate of a range of losses relating to these claims cannot reasonably be made. Based on the foregoing, management does not believe that any of the remaining 37 lawsuits, individually or in the aggregate, will have a material impact on our business, financial position, results of operations or cash flows.

On August 26, 2009, the Company’s subsidiary, NASDI, LLC (“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 illegal dumping activities at a dump site NASDI contracted with to have waste materials disposed of between September 2007 and July 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 in the second quarter of 2011, but has had no further contact with the Massachusetts Attorney General’s office since then. The matter remains open, and, to the Company’s knowledge, no proceedings have currently been initiated against NASDI. Should a claim be brought, NASDI intends to defend itself vigorously. Based on consideration of all of the facts and circumstances now known, the Company does not believe this claim will have a material impact on its business, financial position, results of operations or cash flows.

On March 27, 2011, NASDI received a subpoena from a federal grand jury in the District of Massachusetts directing NASDI to furnish certain documents relating to certain projects performed by NASDI since January 2005. The Company conducted an internal investigation into this matter and continues to fully cooperate with the federal grand jury subpoena. Based on the early stage of the U.S. Department of Justice’s investigation and the limited information known to the Company, the Company cannot predict the outcome of the investigation, the U.S. Attorney’s views of the issues being investigated, any action the U.S. Attorney may take, or the impact, if any, that this matter may have on the Company’s business, financial position, results of operations or cash flows.

The Company has not accrued any amounts with respect to these two NASDI 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.

During the quarter ended March 31, 2012, a favorable judgment was rendered in the Company’s loss of use claim related to the dredge New York allision in the approach channel to Port Newark, New Jersey. In January 2008, the Company filed suit against the M/V Orange Sun and her owners for damages incurred by the Company in connection with the allision. Following a bench trial in the United States District Court in the Southern District of New York, the Court issued an opinion and order in the Company’s favor, entitling Great Lakes to $11,736 in damages plus pre-judgment interest. Judgment was rendered in the aggregate amount of $13,272. Defendants timely appealed the judgment to the United States Court of Appeals for the Second Circuit.Briefing on the appeal is now complete, and oral argument is expected to take place in the first half of 2013. The Company cannot be assured when the appeal will be heard or predict the outcome of the appellate process.

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Document And Entity Information	9 Months Ended
	Sep. 30, 2012	Nov. 02, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Trading Symbol	GLDD
Entity Registrant Name	Great Lakes Dredge & Dock CORP
Entity Central Index Key	0001372020
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		59,279,750

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Acquisition Of Noncontrolling Interest

9 Months Ended

Sep. 30, 2012

Acquisition Of Noncontrolling Interest [Abstract]

Acquisition Of Noncontrolling Interest

10.   Acquisition of noncontrolling interest

The Company previously owned 65% of the profits interests of NASDI. Effective January 1, 2011 the Company reacquired Mr. Christopher Berardi’s 35% membership interest in NASDI for no cost per the terms of NASDI’s limited liability company agreement. This resulted in the elimination of noncontrolling interest of $1,973 during the first quarter ended March 31, 2011. The Company now owns 100% of NASDI. In March 2011, Mr. Berardi resigned his employment with the Company’s demolition segment effective April 29, 2011. Mr. Berardi’s resignation and the repurchase of his NASDI membership interest also resulted in the reversal of a $1,933 accrual established in conjunction with a prior restructuring of ownership interest in NASDI. This reversal was recorded directly to equity as part of the reacquisition of the noncontrolling interest.

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Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Operations [Abstract]
Contract revenues	$ 166,763	$ 158,468	$ 488,202	$ 468,765
Costs of contract revenues	153,743	131,077	431,271	394,166
Gross profit	13,020	27,391	56,931	74,599
General and administrative expenses	11,667	12,736	36,390	38,447
Gain on sale of assets-net	(108)	(131)	(232)	(2,902)
Operating income	1,461	14,786	20,773	39,054
Interest expense-net	(5,105)	(5,571)	(15,747)	(16,432)
Equity in loss of joint ventures	177	606	153	(108)
Loss on foreign currency transactions-net	(40)	(544)	(55)	(544)
Income before income taxes	(3,507)	9,277	5,124	16,825
Income tax (provision) benefits	1,355	(3,618)	(1,977)	(6,600)
Net income	(2,152)	5,659	3,147	10,225
Net loss attributable to noncontrolling interests	20	(57)	226	(525)
Net income attributable to Great Lakes Dredge & Dock Corporation	$ (2,132)	$ 5,602	$ 3,373	$ 9,700
Basic earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ (0.04)	$ 0.10	$ 0.06	$ 0.16
Basic weighted average shares	59,253	58,930	59,154	58,863
Diluted earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ (0.04)	$ 0.09	$ 0.06	$ 0.16
Diluted weighted average shares	59,253	59,161	59,567	59,533
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06

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Fair Value Measurements

9 Months Ended

Sep. 30, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

4.   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 September 30, 2012 and December 31, 2011, the Company held certain derivative contracts that it uses to manage foreign currency risk, commodity price risk and interest rate 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 September 30,  2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Interest rate swap contracts	$	430	$	-	$	430	$	-
Liabilities
Fuel hedge contracts	$	459	$		$	459	$
Foreign exchange contracts		13		-		13		-
Total liabilities measured at fair value	$	472	$	-	$	472	$	-
				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	449	$	-	$	449	$	-
Interest rate swap contracts		755		-		755		-
Foreign exchange contracts		155		-		155		-
Total assets measured at fair value	$	1,359	$	-	$	1,359	$	-

Interest rate swap contracts

In May 2009, the Company entered into two interest rate swap arrangements, which are effective through December 15, 2012, to swap a notional amount of $50 million from a fixed rate of 7.75% to a floating LIBOR-based rate in order to manage the interest rate paid with respect to the Company’s 7.75% senior subordinated notes. Although the senior subordinated notes were redeemed in January 2011, the swaps remain in place. The swaps are not accounted for as a hedge; therefore, the changes in fair value are recorded as adjustments to interest expense in each reporting period.

The Company previously verified the fair value of the interest rate swap contracts using a quantitative model that contained both observable and unobservable inputs. The unobservable inputs related primarily to the implied LIBOR forward rate and the long-term nature of the contracts. As of December 31, 2011, the unobservable inputs began to be corroborated by observable market data and accordingly the Company transferred the swaps into Level 2 of the fair value hierarchy. The change in Level 3 interest rate swap contracts during the comparable quarter of the prior year was as follows:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2011
Interest rate swap contracts
Balance at January 1	$	1,264
Total unrealized gains (losses) included in earnings		(511)
Settlements		445
Balance at September 30	$	1,198
Balance at July 1	$	1,141
Total unrealized gains (losses) included in earnings		57
Settlements		-
Balance at September 30	$	1,198

Foreign exchange contracts

The Company has exposure to foreign currencies that fluctuate in relation to the U.S. dollar. The Company periodically enters into foreign exchange forward contracts to hedge this risk. At September 30, 2012 and December 31, 2011, the Company had one outstanding contract related to the Brazilian Real. This foreign exchange contract is not accounted for as a hedge.

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 backlog.

As of September 30, 2012, 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 2013. As of September 30, 2012, there were 5.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted fuel purchases throughMarch 2013. Under these swap agreements, the Company will pay fixed prices ranging from $2.86 to $3.29 per gallon.

At each balance sheet date, unrealized gains and losses on fuel hedge contracts are recorded as a component of accumulated other comprehensive income (loss) in the condensed consolidated balance sheets. Gains and losses realized upon settlement of fuel hedge contracts are reclassified from accumulated other comprehensive income (loss) as the fuel is utilizedand included in fuel expense, which is a component of costs of contract revenues in the condensed consolidated statements of operations.

At September 30, 2012, the fair value liability of the fuel hedge contracts was estimated to be $459 and is recorded in accrued expenses. At December 31, 2011 the fair value asset of the fuel hedge contracts was estimated to be $449 and is recorded in other current assets. The loss reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the nine months ended September 30, 2012 was $348. The remaining gains and losses included in accumulated other comprehensive income (loss) at September 30, 2012 will be reclassified into earnings over the next  six months, corresponding to the period during which the hedged fuel is expected to be utilized. 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 fair value of the foreign exchange contracts, interest rate and fuel hedge contracts outstanding as of September 30, 2012 and December 31, 2011 is as follows:

	Balance Sheet Location	Fair Value at
		September 30,		December 31,
Asset derivatives:		2012		2011
Derivatives designated as hedges
Fuel hedge contracts	Other current assets	$	-	$	449
Derivatives not designated as hedges
Interest rate swaps	Other current assets		430		755
Foreign exchange contracts	Other current assets		-		155
Total asset derivatives		$	430	$	1,359
Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	459	$	-
Derivatives not designated as hedges
Foreign exchange contracts	Accrued expenses		13		-
Total liability derivatives		$	472	$	-

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, the Company issued $250,000 of 7.375% senior notes due February 1, 2019, which were outstanding at September 30, 2012. The senior notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the senior notes. The fair value of the senior notes was $263,750 atSeptember 30, 2012, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets.

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Accounts Receivable And Contracts In Progress

9 Months Ended

Sep. 30, 2012

Accounts Receivable And Contracts In Progress [Abstract]

Accounts Receivables And Contracts In Progress

3.   Accounts receivable and contracts in progress

Accounts receivable at September 30, 2012 and December 31, 2011 are as follows:

	September 30,		December 31,
	2012		2011
Completed contracts	$	27,119	$	38,317
Contracts in progress		94,671		69,469
Retainage		21,788		20,692
		143,578		128,478
Allowance for doubtful accounts		(750)		(1,839)
Total accounts receivable—net	$	142,828	$	126,639
Current portion of accounts receivable—net	$	134,244	$	120,268
Long-term accounts receivable and retainage		8,584		6,371
Total accounts receivable—net	$	142,828	$	126,639

The components of contracts in progress at September 30, 2012 and December 31, 2011 are as follows:

	September 30,		December 31,
	2012		2011
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	333,058	$	173,187
Amounts billed		(274,273)		(152,045)
Costs and earnings in excess of billings for contracts in progress		58,785		21,142
Costs and earnings in excess of billings for completed contracts		3,361		7,459
Total contract revenues in excess of billings	$	62,146	$	28,601
Current portion of contract revenues in excess of billings	$	62,146	$	26,412
Portion included in other noncurrent assets		-		2,189
Total contract revenues in excess of billings	$	62,146	$	28,601
Billings in excess of costs and earnings:
Amounts billed	$	(451,568)	$	(427,797)
Costs and earnings for contracts in progress		430,751		414,170
Total billings in excess of contract revenues	$	(20,817)	$	(13,627)

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Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2012

Accrued Expenses [Abstract]

Accrued Expenses

	September 30,		December 31,
	2012		2011
Insurance	$	8,353	$	8,285
Payroll and employee benefits		7,567		10,763
Interest		3,200		7,759
Income and other taxes		1,689		1,261
Percentage of completion adjustment		1,313		1,855
Fuel hedge liability		459		-
Other		1,324		1,198
Total accrued expenses	$	23,905	$	31,121

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Subsidiary Guarantors

9 Months Ended

Sep. 30, 2012

Subsidiary Guarantors [Abstract]

Subsidiary Guarantors

11.Subsidiary guarantors

The Company’s long-term debt at September 30, 2012 includes $250,000 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 September 30, 2012 and December 31, 2011;

(ii) statements of operations and comprehensive income for the three and nine months ended September 30, 2012 and 2011; and

(iii) statements of cash flows for the nine months ended September 30, 2012 and 2011.

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF SEPTEMBER 30, 2012
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	38,157	$	167	$	-	$	-	$	38,324
Accounts receivable — net		133,369		875		-		-		134,244
Receivables from affiliates		71,773		8,466		7,443		(87,682)		-
Contract revenues in excess of billings		62,213		206		-		(273)		62,146
Inventories		36,511		-		-		-		36,511
Prepaid expenses and other current assets		40,433		30		10,536		-		50,999
Total current assets		382,456		9,744		17,979		(87,955)		322,224
PROPERTY AND EQUIPMENT—Net		313,338		45		-		-		313,383
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,317		349		-		-		98,666
INVENTORIES — Noncurrent		37,354		-		-		-		37,354
INVESTMENTS IN JOINT VENTURES		7,076		-		-		-		7,076
INVESTMENTS IN SUBSIDIARIES		3,359		-		649,387		(652,746)		-
OTHER		11,351		3		6,629		-		17,983
TOTAL	$	853,251	$	10,141	$	673,995	$	(740,701)	$	796,686
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	91,308	$	711	$	-	$	-	$	92,019
Payables to affiliates		61,980		3,925		21,926		(87,831)		-
Accrued expenses		19,707		833		3,365		-		23,905
Billings in excess of contract revenues		20,808		133		-		(124)		20,817
Current portion of long term debt		2,587		-		-		-		2,587
Total current liabilities		196,390		5,602		25,291		(87,955)		139,328
LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		172		-		104,177		-		104,349
OTHER		5,982		-		775		-		6,757
Total liabilities		205,044		5,602		380,243		(87,955)		502,934
Total Great Lakes Dredge & Dock Corporation Equity		648,207		4,539		293,543		(652,746)		293,543
NONCONTROLLING INTERESTS		-		-		209		-		209
TOTAL EQUITY		648,207		4,539		293,752		(652,746)		293,752
TOTAL	$	853,251	$	10,141	$	673,995	$	(740,701)	$	796,686

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2011
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	108,985	$	4,303	$	-	$	-	$	113,288
Accounts receivable — net		118,530		1,738		-		-		120,268
Receivables from affiliates		79,683		7,729		49,724		(137,136)		-
Contract revenues in excess of billings		26,323		153		-		(64)		26,412
Inventories		33,426		-		-		-		33,426
Prepaid expenses and other current assets		15,929		125		16,330		-		32,384
Total current assets		382,876		14,048		66,054		(137,200)		325,778
PROPERTY AND EQUIPMENT—Net		310,459		61		-		-		310,520
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,474		389		-		-		98,863
INVENTORIES — Noncurrent		30,103		-		-		-		30,103
INVESTMENTS IN JOINT VENTURES		6,923		-		-		-		6,923
INVESTMENTS IN SUBSIDIARIES		4,385		-		627,754		(632,139)		-
OTHER		10,729		3		5,547		(6)		16,273
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	81,971	$	774	$	-	$	-	$	82,745
Payables to affiliates		85,865		7,234		44,053		(137,152)		-
Accrued expenses		22,445		629		8,047		-		31,121
Billings in excess of contract revenues		13,607		68		-		(48)		13,627
Current portion of long term debt		3,033		-		-		-		3,033
Total current liabilities		206,921		8,705		52,100		(137,200)		130,526
LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		399		-		103,959		(6)		104,352
OTHER		7,786		-		759		-		8,545
Total liabilities		217,606		8,705		406,818		(137,206)		495,923
Total Great Lakes Dredge & Dock Corporation Equity		626,343		5,796		291,969		(632,139)		291,969
NONCONTROLLING INTERESTS		-		-		568		-		568
TOTAL EQUITY		626,343		5,796		292,537		(632,139)		292,537
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	165,999	$	2,300	$	-	$	(1,536)	$	166,763
Costs of contract revenues		(153,011)		(2,268)		-		1,536		(153,743)
Gross profit		12,988		32		-		-		13,020
OPERATING EXPENSES:
General and administrative expenses		10,901		192		574		-		11,667
Gain on sale of assets—net		(192)		-		84		-		(108)
Operating income (loss)		2,279		(160)		(658)		-		1,461
Interest expense—net		(96)		(36)		(4,973)		-		(5,105)
Equity in earnings (loss) of subsidiaries		(37)		-		3,585		(3,548)		-
Equity in earnings of joint ventures		177		-		-		-		177
Loss on foreign currency transactions—net		(40)		-		-		-		(40)
Income (loss) before income taxes		2,283		(196)		(2,046)		(3,548)		(3,507)
Income tax (provision) benefit		1,461		-		(106)		-		1,355
Net income (loss)		3,744		(196)		(2,152)		(3,548)		(2,152)
Net loss attributable to noncontrolling interests		-		-		20		-		20
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	3,744	$	(196)	$	(2,132)	$	(3,548)	$	(2,132)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	4,486	$	(196)	$	(1,390)	$	(4,290)	$	(1,390)

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2011
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	155,426	$	6,796	$	-	$	(3,754)	$	158,468
Costs of contract revenues		(127,306)		(7,525)		-		3,754		(131,077)
Gross profit		28,120		(729)		-		-		27,391
OPERATING EXPENSES:
General and administrative expenses		11,630		214		892		-		12,736
Gain on sale of assets—net		(131)		-		-		-		(131)
Operating income (loss)		16,621		(943)		(892)		-		14,786
Interest expense—net		(450)		(61)		(5,060)		-		(5,571)
Equity in earnings (loss) of subsidiaries		208		-		14,864		(15,072)		-
Equity in earnings of joint ventures		606		-		-		-		606
Loss on foreign currency transactions, net		(526)		(18)		-		-		(544)
Income (loss) before income taxes		16,459		(1,022)		8,912		(15,072)		9,277
Income tax (provision) benefit		(365)		-		(3,253)		-		(3,618)
Net income (loss)		16,094		(1,022)		5,659		(15,072)		5,659
Net income attributable to noncontrolling interests		-		-		(57)		-		(57)
Net income (loss) attributable to Great Lakes  Dredge & Dock Corporation	$	16,094	$	(1,022)	$	5,602	$	(15,072)	$	5,602
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	15,190	$	(1,022)	$	4,698	$	(14,168)	$	4,698

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	487,910	$	6,350	$	-	$	(6,058)	$	488,202
Costs of contract revenues		(430,493)		(6,836)		-		6,058		(431,271)
Gross profit		57,417		(486)		-		-		56,931
OPERATING EXPENSES:
General and administrative expenses		34,149		540		1,701		-		36,390
Gain on sale of assets—net		(327)		-		95		-		(232)
Operating income (loss)		23,595		(1,026)		(1,796)		-		20,773
Interest expense—net		(634)		(87)		(15,026)		-		(15,747)
Equity in earnings (loss) of subsidiaries		(639)		-		22,282		(21,643)		-
Equity in earnings of joint ventures		153		-		-		-		153
Loss on foreign currency transactions—net		(55)		-		-		-		(55)
Income (loss) before income taxes		22,420		(1,113)		5,460		(21,643)		5,124
Income tax (provision) benefit		336		-		(2,313)		-		(1,977)
Net income (loss)		22,756		(1,113)		3,147		(21,643)		3,147
Net loss attributable to noncontrolling interests		-		-		226		-		226
Net income (loss) attributable to Great Lakes  Dredge & Dock Corporation	$	22,756	$	(1,113)	$	3,373	$	(21,643)	$	3,373
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	22,210	$	(1,117)	$	2,823	$	(21,093)	$	2,823

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2011
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	460,688	$	16,382	$	-	$	(8,305)	$	468,765
Costs of contract revenues		(387,094)		(15,377)		-		8,305		(394,166)
Gross profit		73,594		1,005		-		-		74,599
OPERATING EXPENSES:
General and administrative expenses		35,356		635		2,456		-		38,447
Gain on sale of assets—net		(2,902)		-		-		-		(2,902)
Operating income (loss)		41,140		370		(2,456)		-		39,054
Interest expense—net		(579)		(160)		(15,693)		-		(16,432)
Equity in earnings (loss) of subsidiaries		1,422		-		42,982		(44,404)		-
Equity in earnings of joint ventures		(108)		-		-		-		(108)
Loss on foreign currency transactions, net		(526)		(18)		-		-		(544)
Loss on extinguishment of debt		-		-		(5,145)		-		(5,145)
Income (loss) before income taxes		41,349		192		19,688		(44,404)		16,825
Income tax (provision) benefit		2,863		-		(9,463)		-		(6,600)
Net income (loss)		44,212		192		10,225		(44,404)		10,225
Net income attributable to noncontrolling interests		-		-		(525)		-		(525)
Net income (loss) attributable to Great Lakes  Dredge & Dock Corporation	$	44,212	$	192	$	9,700	$	(44,404)	$	9,700
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	43,060	$	192	$	8,548	$	(43,252)	$	8,548

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(9,782)	$	57	$	(29,485)	$	-	$	(39,210)
INVESTING ACTIVITIES:
Purchases of property and equipment		(30,015)		-		-		-		(30,015)
Proceeds from dispositions of property and equipment		563		-		-		-		563
Net cash flows used in investing activities		(29,452)		-		-		-		(29,452)
FINANCING ACTIVITIES:
Deferred financing fees		-		-		(2,039)		-		(2,039)
Distributions paid to minority interests		-		-		(133)		-		(133)
Dividends paid		-		-		(3,726)		-		(3,726)
Dividend equivalents paid on restricted stock units		-		-		(39)		-		(39)
Taxes paid on settlement of vested share awards		-		-		(212)		-		(212)
Net change in accounts with affiliates		(31,092)		(4,203)		35,295		-		-
Repayments of equipment debt		(502)		-		-		-		(502)
Exercise of stock options		-		-		200		-		200
Excess income tax benefit from share-based compensation		-		-		139		-		139
Net cash flows provided by (used in) financing activities		(31,594)		(4,203)		29,485		-		(6,312)
Effect of foreign currency exchange rates on cash and cash equivalents		-		10		-		-		10
Net decrease in cash and cash equivalents		(70,828)		(4,136)		-		-		(74,964)
Cash and cash equivalents at beginning of period		108,985		4,303		-		-		113,288
Cash and cash equivalents at end of period	$	38,157	$	167	$	-	$	-	$	38,324

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2011
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	41,250	$	(640)	$	(26,984)	$	-	$	13,626
INVESTING ACTIVITIES:
Purchases of property and equipment		(24,894)		(7)		-		-		(24,901)
Proceeds from dispositions of property and equipment		7,452		-		-		-		7,452
Net cash flows used in investing activities		(17,442)		(7)		-		-		(17,449)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		-		-		250,000		-		250,000
Redemption of 7 3/4% senior subordinated notes		-		-		(175,000)		-		(175,000)
Senior subordinated notes redemption premium		-		-		(2,264)		-		(2,264)
Deferred financing fees		-		-		(5,962)		-		(5,962)
Dividends paid		-		-		(3,473)		-		(3,473)
Dividend equivalents paid on restricted stock units		-		-		(20)		-		(20)
Taxes paid on vested share awards		-		-		(291)				(291)
Net change in accounts with affiliates		33,524		2,557		(36,081)		-		-
Capital contributions		(3,205)		3,205		-		-		-
Repayments of equipment debt		(274)		-		-		-		(274)
Exercise of stock options		-		-		27		-		27
Excess income tax benefit from share-based compensation		-		-		48		-		48
Net cash flows provided by financing activities		30,045		5,762		26,984		-		62,791
Effect of foreign currency exchange rates on cash and cash equivalents		-		(396)		-		-		(396)
Net increase in cash and cash equivalents		53,853		4,719		-		-		58,572
Cash and cash equivalents at beginning of period		48,416		62		-		-		48,478
Cash and cash equivalents at end of period	$	102,269	$	4,781	$	-	$	-	$	107,050

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Share Based Compensation

9 Months Ended

Sep. 30, 2012

Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [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 June 2012, the Company granted 497thousand options to purchase shares of common stock and 273thousand 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 $675 and $2,389, respectively, for the three and nine months ended September 30, 2012 and $381 and $1,224, respectively, for the three and nine months ended September 30, 2011.

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Accrued Expenses

9 Months Ended

Sep. 30, 2012

Accrued Expenses [Abstract]

Accrued Expenses

5.   Accrued expenses

Accrued expenses at September 30, 2012 and December 31, 2011 are as follows:

	September 30,		December 31,
	2012		2011
Insurance	$	8,353	$	8,285
Payroll and employee benefits		7,567		10,763
Interest		3,200		7,759
Income and other taxes		1,689		1,261
Percentage of completion adjustment		1,313		1,855
Fuel hedge liability		459		-
Other		1,324		1,198
Total accrued expenses	$	23,905	$	31,121

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Long-term Debt

9 Months Ended

Sep. 30, 2012

Long-term Debt [Abstract]

Long-Term Debt

6.Long-term debt

On June 4, 2012, the Company entered into a senior revolving credit agreement (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, which replaced the Company’s former revolving credit agreement, provides for a senior revolving credit facility in an aggregate principal amount of up to $175,000, subfacilities for the issuance of standby letters of credit up to a $125,000 sublimit, 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 $50,000. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, and the Company will be 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 prior credit agreement with Bank of America N.A. was terminated.

Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company of 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 revolving credit facility is an unsecured facility and will remain unsecured provided the Company maintains a total leverage ratio less than or equal to 3.75 to 1.00 as of the end of each fiscal quarter. If the leverage ratio exceeds 3.75 to 1.00, or an event of default occurs and is not cured within the applicable grace period, the revolving credit facility will cease to remain unsecured. In the event of the facility becomes secured, outstanding obligations shall be automatically secured by certain vessels and all domestic accounts receivable, subject to the liens and interests of other parties (including the Company’s bonding provider) holding first priority perfected liens.

The new credit facility 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. At September 30, 2012 the Company was in compliance with its debt covenants.

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Segment Information

9 Months Ended

Sep. 30, 2012

Segment Information [Abstract]

Segment Information

8.   Segment information

The Company and its subsidiaries currently operate in two reportable segments: dredging and demolition. 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				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Dredging
Contract revenues	$	138,811	$	134,591	$	395,944	$	396,273
Operating income		2,687		13,593		20,560		45,008
Demolition
Contract revenues	$	27,952	$	23,877	$	92,258	$	72,492
Operating income (loss)		(1,226)		1,193		213		(5,954)
Total
Contract revenues	$	166,763	$	158,468	$	488,202	$	468,765
Operating income		1,461		14,786		20,773		39,054

Dredging contract revenues for the nine months ended September 30, 2012 are net of $1,374 in intersegment revenues. Demolition contract revenues for the nine months ended September 30, 2012 are net of $75 in intersegment revenues. In addition, foreign dredging revenue of $36,329 and $75,202 for thethree and nine months ended September 30, 2012 and $21,843 and $59,779 for the three and nine months ended September 30, 2011, respectively, was primarily attributable to work done in the Middle East as well as the early stages of mobilization for the Wheatstone LNG project in Western Australia.  

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.

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Accrued Expense (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued Expenses [Abstract]
Insurance	$ 8,353	$ 8,285
Payroll and employee benefits	7,567	10,763
Interest	3,200	7,759
Income and other taxes	1,689	1,261
Percentage of completion adjustment	1,313	1,855
Fuel hedge liability	459
Other	1,324	1,198
Total accrued expenses	$ 23,905	$ 31,121

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Accounts Receivable And Contracts In Progress (Tables)

9 Months Ended

Sep. 30, 2012

Accounts Receivable And Contracts In Progress [Abstract]

Schedule Of Accounts Receivable

	September 30,		December 31,
	2012		2011
Completed contracts	$	27,119	$	38,317
Contracts in progress		94,671		69,469
Retainage		21,788		20,692
		143,578		128,478
Allowance for doubtful accounts		(750)		(1,839)
Total accounts receivable—net	$	142,828	$	126,639
Current portion of accounts receivable—net	$	134,244	$	120,268
Long-term accounts receivable and retainage		8,584		6,371
Total accounts receivable—net	$	142,828	$	126,639

Components Of Contracts In Progress

	September 30,		December 31,
	2012		2011
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	333,058	$	173,187
Amounts billed		(274,273)		(152,045)
Costs and earnings in excess of billings for contracts in progress		58,785		21,142
Costs and earnings in excess of billings for completed contracts		3,361		7,459
Total contract revenues in excess of billings	$	62,146	$	28,601
Current portion of contract revenues in excess of billings	$	62,146	$	26,412
Portion included in other noncurrent assets		-		2,189
Total contract revenues in excess of billings	$	62,146	$	28,601
Billings in excess of costs and earnings:
Amounts billed	$	(451,568)	$	(427,797)
Costs and earnings for contracts in progress		430,751		414,170
Total billings in excess of contract revenues	$	(20,817)	$	(13,627)

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Basis Of Presentation (Details)	36 Months Ended
	Dec. 31, 2011
Maximum [Member]
Basis Of Presentation [Line Items]
Average equipment-related costs of total costs of contract revenue	25.00%
Minimum [Member]
Basis Of Presentation [Line Items]
Average equipment-related costs of total costs of contract revenue	21.00%

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Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 38,324	$ 113,288
Accounts receivable - net	134,244	120,268
Contract revenues in excess of billings	62,146	26,412
Inventories	36,511	33,426
Prepaid expenses and other current assets	50,999	32,384
Total current assets	322,224	325,778
Property and equipment - net	313,383	310,520
Goodwill and other intangiable assets - net	98,666	98,863
Inventories- noncurrent	37,354	30,103
Investments in joint ventures	7,076	6,923
Other	17,983	16,273
Total	796,686	788,460
LIABILITIES AND EQUITY
Accounts payable	92,019	82,745
Accrued expenses	23,905	31,121
Billings in excess of contract revenues	20,817	13,627
Current portion of long term debt	2,587	3,033
Total current liabilities	139,328	130,526
Long term note payable	2,500	2,500
7 3/8% Senior notes	250,000	250,000
Deferred income taxes	104,349	104,352
Other	6,757	8,545
Total liabilities	502,934	495,923
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	293,543	291,969
NONCONTROLLING INTERESTS	209	568
Total equity	293,752	292,537
TOTAL	796,686	788,460
GLDD Corporation [Member]
ASSETS
Receivables from affiliates	7,443	49,724
Prepaid expenses and other current assets	10,536	16,330
Total current assets	17,979	66,054
investments in subsidiaries	649,387	627,754
Other	6,629	5,547
Total	673,995	699,355
LIABILITIES AND EQUITY
Payables to affiliates	21,926	44,053
Accrued expenses	3,365	8,047
Total current liabilities	25,291	52,100
7 3/8% Senior notes	250,000	250,000
Deferred income taxes	104,177	103,959
Other	775	759
Total liabilities	380,243	406,818
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	293,543	291,969
NONCONTROLLING INTERESTS	209	568
Total equity	293,752	292,537
TOTAL	673,995	699,355
Subsidiary Guarantors [Member]
ASSETS
Cash and cash equivalents	38,157	108,985
Accounts receivable - net	133,369	118,530
Receivables from affiliates	71,773	79,683
Contract revenues in excess of billings	62,213	26,323
Inventories	36,511	33,426
Prepaid expenses and other current assets	40,433	15,929
Total current assets	382,456	382,876
Property and equipment - net	313,338	310,459
Goodwill and other intangiable assets - net	98,317	98,474
Inventories- noncurrent	37,354	30,103
Investments in joint ventures	7,076	6,923
investments in subsidiaries	3,359	4,385
Other	11,351	10,729
Total	853,251	843,949
LIABILITIES AND EQUITY
Accounts payable	91,308	81,971
Payables to affiliates	61,980	85,865
Accrued expenses	19,707	22,445
Billings in excess of contract revenues	20,808	13,607
Current portion of long term debt	2,587	3,033
Total current liabilities	196,390	206,921
Long term note payable	2,500	2,500
Deferred income taxes	172	399
Other	5,982	7,786
Total liabilities	205,044	217,606
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	648,207	626,343
Total equity	648,207	626,343
TOTAL	853,251	843,949
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	167	4,303
Accounts receivable - net	875	1,738
Receivables from affiliates	8,466	7,729
Contract revenues in excess of billings	206	153
Prepaid expenses and other current assets	30	125
Total current assets	9,744	14,048
Property and equipment - net	45	61
Goodwill and other intangiable assets - net	349	389
Other	3	3
Total	10,141	14,501
LIABILITIES AND EQUITY
Accounts payable	711	774
Payables to affiliates	3,925	7,234
Accrued expenses	833	629
Billings in excess of contract revenues	133	68
Total current liabilities	5,602	8,705
Total liabilities	5,602	8,705
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	4,539	5,796
Total equity	4,539	5,796
TOTAL	10,141	14,501
Eliminations [Member]
ASSETS
Receivables from affiliates	(87,682)	(137,136)
Contract revenues in excess of billings	(273)	(64)
Total current assets	(87,955)	(137,200)
investments in subsidiaries	(652,746)	(632,139)
Other		(6)
Total	(740,701)	(769,345)
LIABILITIES AND EQUITY
Payables to affiliates	(87,831)	(137,152)
Billings in excess of contract revenues	(124)	(48)
Total current liabilities	(87,955)	(137,200)
Deferred income taxes		(6)
Total liabilities	(87,955)	(137,206)
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	(652,746)	(632,139)
Total equity	(652,746)	(632,139)
TOTAL	$ (740,701)	$ (769,345)

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Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ (2,152)		$ 5,659		$ 3,147		$ 10,225
Currency translation adjustment-net of tax			(374)	[1]	(4)	[1]	(374)	[1]
Reclassification of derivative gain (loss) to earnings	(85)	[2]	(183)	[2]	(348)	[2]	(1,250)	[2]
Change in fair value of derivatives-net of tax	827	[3]	(347)	[3]	(198)	[3]	472	[3]
Other comprehensive income (loss)-net of tax, Total	742		(904)		(550)		(1,152)
Comprehensive income	(1,410)		4,755		2,597		9,073
Comprehensive (income) loss attributable to noncontrolling interests	20		(57)		226		(525)
Comprehensive income attributable to Great Lakes Dredge & Dock Corporation	$ (1,390)		$ 4,698		$ 2,823		$ 8,548

[1] Net of income tax (expense) benefit of $0 and $0 for the three months ended September 30, 2012 and 2011, respectively, and $(3) and $0 for nine months ended September 30, 2012 and 2011, respectively.

[2] Net of income tax expense of $56 and $295 for the three months ended September 30, 2012 and 2011, respectively, and $231 and $830 for the nine months ended September 30, 2012 and 2011, respectively.

[3] Net of income tax (expense) benefit of $549 and $(246) for the three months ended September 30, 2012 and 2011, respectively, and $(132) and $(313) for the nine months ended September 30, 2012 and 2011, respectively.

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Earnings Per Share

9 Months Ended

Sep. 30, 2012

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 similar 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 nine months ended September 30, 2012 and the three and nine months ended September 30, 2011,  zero options to purchase shares of common stock were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method.In addition, and in accordance with the treasury stock method, 462 thousand shares of potentially dilutive stock options and restricted stock units were excluded from the diluted weighted-average common shares outstanding for the three months ended September 30, 2012, as the Company incurred a loss during this period.The impact of such shares would have been antidilutive. The computations for basic and diluted earnings per share from continuing operations are as follows:

	Three Months Ended				Nine Months Ended
(shares in thousands)	September 30,				September 30,
	2012		2011		2012		2011
Net income (loss) attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	(2,132)	$	5,602	$	3,373	$	9,700
Weighted-average common shares outstanding — basic		59,253		58,930		59,154		58,863
Effect of stock options and restricted stock units		-		231		413		670
Weighted-average common shares outstanding — diluted		59,253		59,161		59,567		59,533
Earnings (loss) per share — basic	$	(0.04)	$	0.10	$	0.06	$	0.16
Earnings (loss) per share — diluted	$	(0.04)	$	0.09	$	0.06	$	0.16

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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	462	0	0	0
Net income attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$ (2,132)	$ 5,602	$ 3,373	$ 9,700
Weighted-average common shares outstanding - basic	59,253	58,930	59,154	58,863
Effect of stock options and restricted stock units		231	413	670
Weighted-average common shares outstanding - diluted	59,253	59,161	59,567	59,533
Earnings per share - basic	$ (0.04)	$ 0.10	$ 0.06	$ 0.16
Earnings per share - diluted	$ (0.04)	$ 0.09	$ 0.06	$ 0.16

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Commitments And Contingencies (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Jan. 31, 2011
Letters of credit outstanding	$ 33,252,000
Letter of credit remaining borrowing capacity	141,748,000
Senior notes interest rate	7.375%		7.375%
Outstanding performance bonds	457,924,000
Revenue value remaining from outstanding performance bonds	133,252,000
Senior Notes	250,000,000	250,000,000	250,000,000
Asbestos related personal lawsuit injury	251
Actual cases	40
Dismissal cases	3
Cases pending	37
Maximum [Member]
Bids bond range	10,000,000
Judgement	13,272,000
Minimum [Member]
Bids bond range	1,000,000
Judgement	11,736,000
Foreign Line of Credit [Member]
Letters of credit , maximum borrowing capacity	$ 24,000,000

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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Computations For Basic And Diluted Earnings Per Share From Continuing Operations

	Three Months Ended				Nine Months Ended
(shares in thousands)	September 30,				September 30,
	2012		2011		2012		2011
Net income (loss) attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	(2,132)	$	5,602	$	3,373	$	9,700
Weighted-average common shares outstanding — basic		59,253		58,930		59,154		58,863
Effect of stock options and restricted stock units		-		231		413		670
Weighted-average common shares outstanding — diluted		59,253		59,161		59,567		59,533
Earnings (loss) per share — basic	$	(0.04)	$	0.10	$	0.06	$	0.16
Earnings (loss) per share — diluted	$	(0.04)	$	0.09	$	0.06	$	0.16