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 March 31, 2013

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 May 3, 2013, 59,390,161 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 March 31, 2013

INDEX

	Page
Part I Financial Information (Unaudited)		3
Item 1 Financial Statements		3
Condensed Consolidated Balance Sheets at March 31, 2013 and December 31, 2012		3
Condensed Consolidated Statements of Operations for the Three Months ended March 31, 2013 and 2012		4
Condensed Consolidated Statements of Comprehensive Income for the Three Months ended March 31, 2013 and 2012		5
Condensed Consolidated Statements of Equity for the Three Months ended March 31, 2013 and 2012		6
Condensed Consolidated Statements of Cash Flows for the Three Months ended March 31, 2013 and 2012		7
Notes to Condensed Consolidated Financial Statements		8
Item 2 Management’s Discussion and Analysis of Financial Condition and Results of Operations		22
Item 3 Quantitative and Qualitative Disclosures About Market Risk		30
Item 4 Controls and Procedures		31
Part II Other Information		32
Item 1 Legal Proceedings		32
Item 1A Risk Factors		32
Item 2 Unregistered Sales of Equity Securities and Use of Proceeds		32
Item 3 Defaults Upon Senior Securities		32
Item 4 Mine Safety Disclosures		32
Item 5 Other Information		32
Item 6 Exhibits		33
Signature		34
Exhibit Index		35

2

PART I — Financial Information

Item 1. Financial Statements.

GREAT LAKES DREDGE  & DOCK CORPORATION AND SUBSIDIARIES

Condensed Consolidated Balance Sheets

(Unaudited)

(in thousands, except per share amounts)

	March 31,			December 31,
	2013			2012
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	6,643		$	24,440
Accounts receivable—net		141,250			149,142
Contract revenues in excess of billings		73,916			69,574
Inventories		26,629			28,726
Prepaid expenses and other current assets		40,479			41,808
Total current assets		288,917			313,690
PROPERTY AND EQUIPMENT—Net		347,740			346,540
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		103,967			104,031
INVENTORIES—Noncurrent		36,423			37,392
INVESTMENTS IN JOINT VENTURES		6,457			7,047
OTHER		17,509			17,695
TOTAL	$	801,013		$	826,395
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	88,624		$	123,082
Accrued expenses		40,561			38,490
Billings in excess of contract revenues		9,529			11,280
Current portion of long term debt		2,526			13,098
Total current liabilities		141,240			185,950
7 3/8% SENIOR NOTES		250,000			250,000
REVOLVING CREDIT FACILITY		21,500			—
DEFERRED INCOME TAXES		103,436			106,767
OTHER		10,252			10,253
Total liabilities		526,428			552,970
COMMITMENTS AND CONTINGENCIES (Note 8)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 59,391 and 59,359 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively.		6			6
Additional paid-in capital		272,156			271,418
Retained earnings		3,024			2,591
Accumulated other comprehensive loss		(369	)		(380	)
Total Great Lakes Dredge & Dock Corporation equity		274,817			273,635
NONCONTROLLING INTERESTS		(232	)		(210	)
Total equity		274,585			273,425
TOTAL	$	801,013		$	826,395

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
	March 31,
	2013			2012
Contract revenues	$	188,847		$	154,907
Costs of contract revenues		163,064			134,885
Gross profit		25,783			20,022
General and administrative expenses		19,187			13,267
(Gain) loss on sale of assets—net		2			(31	)
Operating income		6,594			6,786
Interest expense—net		(5,733	)		(5,259	)
Equity in loss of joint ventures		(590	)		(16	)
Gain on foreign currency transactions—net		36			6
Income before income taxes		307			1,517
Income tax (provision) benefit		104			(564	)
Net income		411			953
Net loss attributable to noncontrolling interests		22			115
Net income attributable to Great Lakes Dredge & Dock Corporation	$	433		$	1,068
Basic earnings per share attributable to Great Lakes Dredge & Dock Corporation	$	0.01		$	0.02
Basic weighted average shares		59,369			59,038
Diluted earnings per share attributable to Great Lakes Dredge & Dock Corporation	$	0.01		$	0.02
Diluted weighted average shares		60,017			59,434
Dividends declared per share	$	—		$	0.02

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
	March 31,
	2013			2012
Net income	$	411		$	953
Currency translation adjustment—net of tax (1)		(6	)		4
Net unrealized gain on derivatives—net of tax (2)		17			474
Other comprehensive income—net of tax		11			478
Comprehensive income		422			1,431
Comprehensive loss attributable to noncontrolling interests		22			115
Comprehensive income attributable to Great Lakes Dredge & Dock Corporation	$	444		$	1,546

(1) Net of income tax (expense) benefit of $(4) and $3 for the three months ended March 31, 2013 and 2012, respectively.

(2) Net of income tax benefit of $11 and $315 for the three months ended March 31, 2013 and 2012, 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)

	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, 2013		59,359	$	6	$	271,418		$	2,591		$	(380	)	$	(210	)	$	273,425
Share-based compensation		27		—		751			—			—			—			751
Vesting of restricted stock units, including impact of shares withheld for taxes		5		—		(28	)		—			—			—			(28	)
Excess income tax benefit from share-based compensation		—		—		15			—			—			—			15
Net income (loss)		—		—		—			433			—			(22	)		411
Other comprehensive income—net of tax		—		—		—			—			11			—			11
BALANCE—March 31, 2013		59,391	$	6	$	272,156		$	3,024		$	(369	)	$	(232	)	$	274,585
	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	$	6	$	267,918		$	24,042		$	3		$	568		$	292,537
Share-based compensation		94		—		1,015			—			—			—			1,015
Vesting of restricted stock units, including impact of shares withheld for taxes		9		—		(2	)		—			—			—			(2	)
Exercise of stock options		8		—		40			—			—			—			40
Excess income tax benefit from share-based compensation		—		—		27			—			—			—			27
Dividends declared and paid		—		—		—			(1,240	)		—			—			(1,240	)
Dividend equivalents paid on restricted stock units		—		—		—			(12	)		—			—			(12	)
Net income (loss)		—		—		—			1,068			—			(115	)		953
Other comprehensive income—net of tax		—		—		—			—			478			—			478
BALANCE—March 31, 2012		59,111	$	6	$	268,998		$	23,858		$	481		$	453		$	293,796

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)

	Three Months Ended March 31,
	2013			2012
OPERATING ACTIVITIES:
Net income	$	411		$	953
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization		12,075			7,764
Equity in loss of joint ventures		590			16
Deferred income taxes		(2,585	)		107
(Gain) Loss on dispositions of property and equipment		2			(31	)
Amortization of deferred financing fees		288			334
Unrealized foreign currency (gain) loss		41			(133	)
Share-based compensation expense		751			1,015
Excess income tax benefit from share-based compensation		(15	)		(27	)
Changes in assets and liabilities:
Accounts receivable		8,408			(1,842	)
Contract revenues in excess of billings		(4,351	)		(5,819	)
Inventories		3,066			(1,869	)
Prepaid expenses and other current assets		1,343			(7,399	)
Accounts payable and accrued expenses		(30,695	)		(21,263	)
Billings in excess of contract revenues		(1,751	)		10,126
Other noncurrent assets and liabilities		(810	)		(176	)
Net cash flows used in operating activities		(13,232	)		(18,244	)
INVESTING ACTIVITIES:
Purchases of property and equipment		(15,514	)		(8,101	)
Proceeds from dispositions of property and equipment		58			68
Net cash flows used in investing activities		(15,456	)		(8,033	)
FINANCING ACTIVITIES:
Repayments of long term note payable		(10,547	)		—
Dividends paid		—			(1,240	)
Dividend equivalents paid on restricted stock units		—			(12	)
Taxes paid on settlement of vested share awards		(28	)		(2	)
Repayments of equipment debt		(25	)		(238	)
Exercise of stock options		—			40
Excess income tax benefit from share-based compensation		15			27
Borrowings under revolving loans		79,500			—
Repayments of revolving loans		(58,000	)		—
Net cash flows provided by (used in) financing activities		10,915			(1,425	)
Effect of foreign currency exchange rates on cash and cash equivalents		(24	)		32
Net decrease in cash and cash equivalents		(17,797	)		(27,670	)
Cash and cash equivalents at beginning of period		24,440			113,288
Cash and cash equivalents at end of period	$	6,643		$	85,618
Supplemental Cash Flow Information
Cash paid for interest	$	9,881		$	9,582
Cash paid (refunded) for income taxes	$	241		$	(2,926	)
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$	6,253		$	4,957

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 its 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, 2012. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of March 31, 2013, and its results of operations for the three months ended March 31, 2013 and 2012 and cash flows for the three months ended March 31, 2013 and 2012 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 coastal protection 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 20% to 23% of total costs of contract revenues over the prior three years. During the year, both equipment utilization and the timing of fixed cost expenditures fluctuate significantly. Accordingly, the Company allocates these fixed equipment costs to interim periods in proportion to revenues recognized over the year, to better match revenues and expenses. Specifically, at each interim reporting date the Company compares actual revenues earned to date on its dredging contracts to expected annual revenues and recognizes equipment costs on the same proportionate basis. In the fourth quarter, any over or under allocated equipment costs are recognized such that the expense for the year equals actual equipment costs incurred during the year.

The Company operates in four operating segments that, through aggregation, comprise two reportable segments: dredging and demolition. Four operating segments were aggregated into two reportable segments as the segments have similarity in economic margins, services, production processes, customer types, distribution methods and regulatory environment. The Company has determined that the operating segments are the Company’s four reporting units.

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.

8

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 three months ended March 31, 2013 and 2012, 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. The computations for basic and diluted earnings per share from continuing operations are as follows:

	Three Months Ended March 31,
	2013		2012
Net income attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	433	$	1,068
Weighted-average common shares outstanding — basic		59,369		59,038
Effect of stock options and restricted stock units		648		396
Weighted-average common shares outstanding — diluted		60,017		59,434
Earnings per share — basic	$	0.01	$	0.02
Earnings per share — diluted	$	0.01	$	0.02

3. Accounts receivable and contracts in progress

Accounts receivable at March 31, 2013 and December 31, 2012 are as follows:

	March 31, 2013			December 31, 2012
Completed contracts	$	56,984		$	43,898
Contracts in progress		74,653			91,459
Retainage		20,119			24,419
		151,756			159,776
Allowance for doubtful accounts		(2,469	)		(2,050	)
Total accounts receivable—net	$	149,287		$	157,726
Current portion of accounts receivable—net	$	141,250		$	149,142
Long-term accounts receivable and retainage		8,037			8,584
Total accounts receivable—net	$	149,287		$	157,726

The components of contracts in progress at March 31, 2013 and December 31, 2012 are as follows:

	March 31, 2013			December 31, 2012
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	346,231		$	458,750
Amounts billed		(279,717	)		(392,860	)
Costs and earnings in excess of billings for contracts in progress		66,514			65,890
Costs and earnings in excess of billings for completed contracts		7,402			3,684
Total contract revenues in excess of billings	$	73,916		$	69,574
Billings in excess of costs and earnings:
Amounts billed	$	(376,801	)	$	(338,741	)
Costs and earnings for contracts in progress		367,272			327,461
Total billings in excess of contract revenues	$	(9,529	)	$	(11,280	)

9

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 March 31, 2013 and December 31, 2012, the Company held certain derivative contracts that it uses to manage commodity price risk. The Company does not hold or issue derivatives for speculative or trading purposes. The fair values of these financial instruments are summarized as follows:

			Fair Value Measurements at Reporting Date Using
Description	At March 31, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	150	$	—	$	150	$	—
			Fair Value Measurements at Reporting Date Using
Description	At December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	178	$	—	$	178	$	—

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 March 31, 2013, 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 2014. As of March 31, 2013, there were 2.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted fuel purchases through March 2014. Under these swap agreements, the Company will pay fixed prices ranging from $3.01 to $3.26 per gallon.

At March 31, 2013, the fair value liability of the fuel hedge contracts was estimated to be $150 and is recorded in accrued expenses. At December 31, 2012 the fair value liability of the fuel hedge contracts was estimated to be $178 and is recorded in accrued expenses. The loss reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the three months ended March 31, 2013 was $137. The remaining gains and losses included in accumulated other comprehensive income (loss) at March 31, 2013 will be reclassified into earnings over the next twelve 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.

10

The fair value of the fuel hedge contracts outstanding as of March 31, 2013 and December 31, 2012 is as follows:

			Fair Value at
	Balance Sheet Location		March 31, 2013		December 31, 2012
Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts		Accrued expenses	$	150	$	178

Accumulated other comprehensive income

Changes in the components of the accumulated balances of other comprehensive income are as follows:

	Three months ended, March  31,
	2013			2012
Cumulative translation adjustments—net of tax	$	(6	)	$	4
Derivatives:
Reclassification of derivative losses (gains) to earnings—net of tax		137			(406	)
Change in fair value of derivatives—net of tax		(120	)		880
Net unrealized gain on derivatives—net of tax		17			474
Total other comprehensive income—net of tax	$	11		$	478

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

		Three months ended March  31,
	Statement of Operations Location	2013			2012
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	228		$	(675	)
	Income tax (provision) benefit		(91	)		269
		$	137		$	(406	)

Other financial instruments

The carrying value of financial instruments included in current assets and current liabilities approximates fair value due to the short-term maturities of these instruments. Based on timing of the cash flows and comparison to current market interest rates, the carrying value of our senior revolving credit agreement approximates fair value. In January 2011, the Company issued $250,000 of 7.375% senior notes due February 1, 2019, which were outstanding at March 31, 2013. 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 March 31, 2013, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets.

5. Accrued expenses

Accrued expenses at March 31, 2013 and December 31, 2012 are as follows:

	March 31, 2013		December 31, 2012
Insurance	$	10,139	$	9,070
Payroll and employee benefits		9,560		9,906
Construction liabilities		9,423		6,426
Interest		3,401		7,837
Income and other taxes		1,903		1,699
Plant & overhead accrual		1,898		—
Percentage of completion adjustment		1,719		1,552
Other		2,518		2,000
Total accrued expenses	$	40,561	$	38,490

11

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 at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum.

The 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 Credit Agreement requires the Company to maintain a net leverage ratio less than or equal to 4.50 to 1.00 as of the end of each fiscal quarter and a minimum fixed charge coverage ratio of 1.25 to 1.00. At December 31, 2012, the Company’s fixed charge coverage ratio was 1.12x, resulting in an event of default under the Credit Agreement.

On March 15, 2013, the Company executed a Waiver and Amendment No. 2 to the Credit Agreement (the “Credit Agreement Waiver and Amendment”) pursuant to which the counterparties thereto agreed, among other things, to waive any default, event of default, or possible event of default, as applicable, related to the Company’s failure to meet the above-described financial covenant in the Credit Agreement.

Separately, the Company determined that a perfection trigger event had occurred under the Credit Agreement as of December 31, 2012. As a result, the outstanding obligations under the Credit Agreement, which were previously unsecured, are now secured by liens on certain of the Company’s vessels and all of its domestic accounts receivable, subject to the liens and interests of certain other parties holding first priority perfected liens. Under the original terms of the Credit Agreement, the obligations thereunder that became secured under these circumstances could again become unsecured provided that (i) no event of default has occurred and is continuing and (ii) the Company has maintained for two consecutive quarters, and is projected to maintain for the next two consecutive quarters, a total leverage ratio less than or equal to 3.75 to 1.0. Pursuant to the Credit Agreement Waiver and Amendment, this provision has been amended to add the additional condition that no release of the liens securing the obligations under the Credit Agreement can occur until the Company has delivered to the lenders its audited financial statements with respect to its fiscal year ending December 31, 2013.

The obligations of Great Lakes under the Credit Agreement are unconditionally guaranteed, on a joint and several basis, by each existing and subsequently acquired or formed material direct and indirect domestic subsidiary of the Company. During a year, the Company frequently borrows and repays amounts under its revolving credit facility. As of March 31, 2013, the Company had $21,500 of borrowings on the revolver and $33,420 of letters of credit outstanding, resulting in $120,080 of availability under the Credit Agreement. At March 31, 2013, the Company was in compliance with its various covenants under its Credit Agreement.

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 March 31, 2013, Great Lakes had no letters of credit outstanding under this facility. At March 31, 2013, the Company also had $250,000 of 7.375% senior notes outstanding, which mature in February 2019.

12

7. 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 March 31,
	2013			2012
Dredging
Contract revenues	$	173,959		$	123,673
Operating income		19,000			4,899
Demolition
Contract revenues	$	14,888		$	32,546
Operating income (loss)		(12,406	)		1,887
Intersegment revenues	$	—		$	(1,312	)
Total
Contract revenues	$	188,847		$	154,907
Operating income		6,594			6,786

Foreign dredging revenue of $38,385 and $18,025 for the three months ended March 31, 2013 and 2012, respectively, was primarily attributable to work done in the Middle East as well as 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.

8. Commitments and contingencies

Commercial commitments

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 March 31, 2013, the Company had outstanding performance bonds valued at approximately $612,677; however, the revenue value remaining in backlog related to these projects totaled approximately $186,754. 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 the Company’s results of operations, cash flows or financial condition.

13

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.

On March 19, 2013, the Company and three of its current and former executives were sued in a securities class action in the Northern District of Illinois captioned United Union of Roofers, Waterproofers & Allied Workers Local Union No. 8 v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02115. The lawsuit, which was brought on behalf of all purchasers of the Company’s securities between August 7, 2012 and March 14, 2013, primarily alleges that the defendants made false and misleading statements regarding the recognition of revenue in the demolition segment and with regard to the Company’s internal control over financial reporting. This suit was filed following the Company’s announcement on March 14, 2013 that it would restate its second and third quarter 2012 financial statements. Two additional, similar lawsuits captioned Boozer v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02339, and Connors v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02450, were filed in the Northern District of Illinois on March 28, 2013, and April 2, 2013, respectively. The Company denies liability and intends to vigorously defend these actions.

On March 28, 2013, the Company was named as a nominal defendant, and its directors were named as defendants, in a shareholder derivative action in DuPage County Circuit Court in Illinois captioned Hammoud v. Berger et al., Case No. 2013CH001110. The lawsuit primarily alleges breaches of fiduciary duties related to allegedly false and misleading statements regarding the recognition of revenue in the demolition segment and with regard to the Company’s internal control over financial reporting, which exposed the Company to securities litigation. A second, similar lawsuit captioned The City of Haverhill Retirement System v. Leight et al., Case No. 1:13-cv-02470, was filed in the Northern District of Illinois on April 2, 2013.

The Company has not accrued any amounts with respect to the above matters as the Company does not believe, based on information currently known to it, that a loss relating to these matters is probable, and an estimate of a range of potential losses relating to these matters cannot reasonably be made.

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. Oral argument was conducted on April 5, 2013 and on April 30, 2013 the appellate panel summarily affirmed the trial court’s opinion in favor of Great Lakes. The defendants are entitled to appeal the decision to either the Second Circuit en banc or the Supreme Court of the United States. The Company cannot be assured whether defendants will continue to appeal the judgment or predict the outcome of any further appellate process.

14

9. Subsidiary guarantors

The Company’s long-term debt at March 31, 2013 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 March 31, 2013 and December 31, 2012;

(ii) statements of operations and comprehensive income for the three months ended March 31, 2013 and 2012; and

(iii) statements of cash flows for the three months ended March 31, 2013 and 2012.

15

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF MARCH 31, 2013

(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation			Eliminations			Consolidated Totals
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	6,336	$	307	$	—		$	—		$	6,643
Accounts receivable — net		137,857		3,393		—			—			141,250
Receivables from affiliates		87,422		5,982		3,514			(96,918	)		—
Contract revenues in excess of billings		73,450		534		—			(68	)		73,916
Inventories		26,629		—		—			—			26,629
Prepaid expenses and other current assets		29,326		20		11,133			—			40,479
Total current assets		361,020		10,236		14,647			(96,986	)		288,917
PROPERTY AND EQUIPMENT—Net		347,706		34		—			—			347,740
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		103,633		334		—			—			103,967
INVENTORIES — Noncurrent		36,423		—		—			—			36,423
INVESTMENTS IN JOINT VENTURES		6,457		—		—			—			6,457
INVESTMENTS IN SUBSIDIARIES		2,081		—		650,100			(652,181	)		—
OTHER		11,444		3		6,062			—			17,509
TOTAL	$	868,764	$	10,607	$	670,809		$	(749,167	)	$	801,013
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	86,909	$	1,310	$	405		$	—		$	88,624
Payables to affiliates		75,529		4,720		16,525			(96,774	)		—
Accrued expenses		35,980		726		3,855			—			40,561
Billings in excess of contract revenues		9,474		267		—			(212	)		9,529
Current portion of long term debt		2,526		—		—			—			2,526
Total current liabilities		210,418		7,023		20,785			(96,986	)		141,240
7 3/8% SENIOR NOTES		—		—		250,000			—			250,000
REVOLVING CREDIT FACILITY		—		—		21,500			—			21,500
DEFERRED INCOME TAXES		45		—		103,391			—			103,436
OTHER		9,704		—		548			—			10,252
Total liabilities		220,167		7,023		396,224			(96,986	)		526,428
Total Great Lakes Dredge & Dock Corporation Equity		648,597		3,584		274,817			(652,181	)		274,817
NONCONTROLLING INTERESTS		—		—		(232	)		—			(232	)
TOTAL EQUITY		648,597		3,584		274,585			(652,181	)		274,585
TOTAL	$	868,764	$	10,607	$	670,809		$	(749,167	)	$	801,013

16

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF DECEMBER 31, 2012

(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation			Eliminations			Consolidated Totals
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	24,272	$	168	$	—		$	—		$	24,440
Accounts receivable — net		147,610		1,532		—			—			149,142
Receivables from affiliates		102,968		7,680		38,115			(148,763	)		—
Contract revenues in excess of billings		69,649		5		—			(80	)		69,574
Inventories		28,726		—		—			—			28,726
Prepaid expenses and other current assets		27,147		28		14,633			—			41,808
Total current assets		400,372		9,413		52,748			(148,843	)		313,690
PROPERTY AND EQUIPMENT—Net		346,503		37		—			—			346,540
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		103,687		344		—			—			104,031
INVENTORIES — Noncurrent		37,392		—		—			—			37,392
INVESTMENTS IN JOINT VENTURES		7,047		—		—			—			7,047
INVESTMENTS IN SUBSIDIARIES		2,127		—		618,070			(620,197	)		—
OTHER		11,350		2		6,343			—			17,695
TOTAL	$	908,478	$	9,796	$	677,161		$	(769,040	)	$	826,395
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	122,191	$	891	$	—		$	—		$	123,082
Payables to affiliates		105,303		4,843		38,647			(148,793	)		—
Accrued expenses		29,417		677		8,396			—			38,490
Billings in excess of contract revenues		11,207		123		—			(50	)		11,280
Current portion of long term debt		13,098		—		—			—			13,098
Total current liabilities		281,216		6,534		47,043			(148,843	)		185,950
7 3/8% SENIOR NOTES		—		—		250,000			—			250,000
DEFERRED INCOME TAXES		623		—		106,144			—			106,767
OTHER		9,704		—		549			—			10,253
Total liabilities		291,543		6,534		403,736			(148,843	)		552,970
Total Great Lakes Dredge & Dock Corporation Equity		616,935		3,262		273,635			(620,197	)		273,635
NONCONTROLLING INTERESTS		—		—		(210	)		—			(210	)
TOTAL EQUITY		616,935		3,262		273,425			(620,197	)		273,425
TOTAL	$	908,478	$	9,796	$	677,161		$	(769,040	)	$	826,395

17

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME

FOR THE THREE MONTHS ENDED MARCH 31, 2013

(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
Contract revenues	$	185,419		$	3,759		$	—		$	(331	)	$	188,847
Costs of contract revenues		(159,932	)		(3,463	)		—			331			(163,064	)
Gross profit		25,487			296			—			—			25,783
OPERATING EXPENSES:
General and administrative expenses		18,996			191			—			—			19,187
(Gain) loss on sale of assets—net		2			—			—			—			2
Operating income		6,489			105			—			—			6,594
Interest expense—net		(19	)		(42	)		(5,672	)		—			(5,733	)
Equity in earnings (loss) of subsidiaries		(47	)		—			9,556			(9,509	)		—
Equity in loss of joint ventures		(590	)		—			—			—			(590	)
Gain on foreign currency transactions—net		36			—			—			—			36
Income (loss) before income taxes		5,869			63			3,884			(9,509	)		307
Income tax (provision) benefit		3,577			—			(3,473	)		—			104
Net income (loss)		9,446			63			411			(9,509	)		411
Net loss attributable to noncontrolling interests		—			—			22			—			22
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	9,446		$	63		$	433		$	(9,509	)	$	433
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	9,463		$	57		$	444		$	(9,520	)	$	444

18

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME

FOR THE THREE MONTHS ENDED MARCH 31, 2012

(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations			Consolidated Totals
Contract revenues	$	155,444		$	1,799		$	—		$	(2,336	)	$	154,907
Costs of contract revenues		(135,167	)		(2,054	)		—			2,336			(134,885	)
Gross profit		20,277			(255	)		—			—			20,022
OPERATING EXPENSES:
General and administrative expenses		12,569			186			512			—			13,267
(Gain) loss on sale of assets—net		(42	)		—			11			—			(31	)
Operating income (loss)		7,750			(441	)		(523	)		—			6,786
Interest expense—net		(281	)		(28	)		(4,950	)		—			(5,259	)
Equity in earnings (loss) of subsidiaries		(379	)		—			6,347			(5,968	)		—
Equity in loss of joint ventures		(16	)		—			—			—			(16	)
Gain on foreign currency transactions, net		6			—			—			—			6
Income (loss) before income taxes		7,080			(469	)		874			(5,968	)		1,517
Income tax (provision) benefit		(643	)		—			79			—			(564	)
Net income (loss)		6,437			(469	)		953			(5,968	)		953
Net loss attributable to noncontrolling interests		—			—			115			—			115
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	6,437		$	(469	)	$	1,068		$	(5,968	)	$	1,068
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	6,911		$	(465	)	$	1,546		$	(6,446	)	$	1,546

19

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE THREE MONTHS ENDED MARCH 31, 2013

(In thousands)

	Subsidiary Guarantors			Non-Guarantor Subsidiaries			GLDD Corporation			Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(8,582	)	$	(1,698	)	$	(2,952	)	$	—	$	(13,232	)
INVESTING ACTIVITIES:
Purchases of property and equipment		(15,514	)		—			—			—		(15,514	)
Proceeds from dispositions of property and equipment		58			—			—			—		58
Net cash flows used in investing activities		(15,456	)		—			—			—		(15,456	)
FINANCING ACTIVITIES:
Repayments of long term note payable		—			—			(10,547	)		—		(10,547	)
Taxes paid on settlement of vested share awards		—			—			(28	)		—		(28	)
Net change in accounts with affiliates		6,127			1,861			(7,988	)		—		—
Repayments of equipment debt		(25	)		—			—			—		(25	)
Excess income tax benefit from share-based compensation		—			—			15			—		15
Borrowings under revolving loans		—			—			79,500			—		79,500
Repayments of revolving loans		—			—			(58,000	)		—		(58,000	)
Net cash flows provided by (used in) financing activities		6,102			1,861			2,952			—		10,915
Effect of foreign currency exchange rates on cash and cash equivalents		—			(24	)		—			—		(24	)
Net increase (decrease) in cash and cash equivalents		(17,936	)		139			—			—		(17,797	)
Cash and cash equivalents at beginning of period		24,272			168			—			—		24,440
Cash and cash equivalents at end of period	$	6,336		$	307		$	—		$	—	$	6,643

20

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE THREE MONTHS ENDED MARCH 31, 2012

(In thousands)

	Subsidiary Guarantors			Non- Guarantor Subsidiaries			GLDD Corporation			Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(5,200	)	$	801		$	(13,845	)	$	—	$	(18,244	)
INVESTING ACTIVITIES:
Purchases of property and equipment		(8,101	)		—			—			—		(8,101	)
Proceeds from dispositions of property and equipment		68			—			—			—		68
Net cash flows used in investing activities		(8,033	)		—			—			—		(8,033	)
FINANCING ACTIVITIES:
Dividends paid		—			—			(1,240	)		—		(1,240	)
Dividend equivalents paid on restricted stock units		—			—			(12	)		—		(12	)
Taxes paid on settlement of vested share awards		—			—			(2	)				(2	)
Net change in accounts with affiliates		(10,089	)		(4,978	)		15,067			—		—
Capital contributions		—			35			(35	)		—		—
Repayments of equipment debt		(238	)		—			—			—		(238	)
Exercise of stock options		—			—			40			—		40
Excess income tax benefit from share-based compensation		—			—			27			—		27
Net cash flows provided by (used in) financing activities		(10,327	)		(4,943	)		13,845			—		(1,425	)
Effect of foreign currency exchange rates on cash and cash equivalents		—			32			—			—		32
Net decrease in cash and cash equivalents		(23,560	)		(4,110	)		—			—		(27,670	)
Cash and cash equivalents at beginning of period		108,985			4,303			—			—		113,288
Cash and cash equivalents at end of period	$	85,425		$	193		$	—		$	—	$	85,618

21

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

Cautionary Note Regarding Forward-Looking Statements

Certain statements in this Quarterly Report on Form 10-Q may constitute “forward-looking” statements as defined in Section 27A of the Securities Act of 1933 (the “Securities Act”), Section 21E of the Securities Exchange Act of 1934 (the “Exchange Act”), the Private Securities Litigation Reform Act of 1995 (the “PSLRA”) or in releases made by the Securities and Exchange Commission (“SEC”), all as may be amended from time to time. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause the actual results, performance or achievements of Great Lakes Dredge & Dock Corporation and its subsidiaries (“Great Lakes” or the “Company”), or industry results, to differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements. Statements that are not historical fact are forward-looking statements. Forward-looking statements can be identified by, among other things, the use of forward-looking language, such as the words “plan,” “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “may,” “would,” “could,” “should,” “seeks,” or “scheduled to,” or other similar words, or the negative of these terms or other variations of these terms or comparable language, or by discussion of strategy or intentions. These cautionary statements are being made pursuant to the Securities Act, the Exchange Act and the PSLRA with the intention of obtaining the benefits of the “safe harbor” provisions of such laws. Great Lakes cautions investors that any forward-looking statements made by Great Lakes are not guarantees or indicative of future performance. Important assumptions and other important factors that could cause actual results to differ materially from those forward-looking statements with respect to Great Lakes, include, but are not limited to, risks and uncertainties that are described in Item 1A. “Risk Factors” of Great Lakes’ Annual Report on Form 10-K for the year ended December 31, 2012, and in other securities filings by Great Lakes with the SEC.

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

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 22% of its dredging revenues for the first three months of 2013, compared with the Company’s prior three year average of 16%. 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, coastal protection 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 37% over the prior three years, including 29%, 60% and 31% of the domestic capital, coastal protection and maintenance sectors, respectively. The Company’s average bid market share of rivers & lakes in the two years of activity since the Matteson acquisition is 43%.

The Company’s largest domestic dredging customer is the U.S. Army Corps of Engineers (the “Corps”), which is responsible for civil projects related to navigation and improvements to U.S. waters and related resources. In the first three months of 2013, 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 41% of dredging revenues, below the Company’s prior three year average of 62%.

The Company’s demolition subsidiaries, collectively, are a U.S. provider of commercial and industrial demolition and remediation services such as exterior and interior demolition for site preparation as well as environmental remediation. 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 are pursuing opportunities outside of the New England area and into the marine demolition markets, specifically bridge demolition across the eastern part of the U.S. Through an acquisition in 2012, the segment’s scope of work has expanded into the Midwest U.S. market. In the first three months of 2013, demolition revenues accounted for 8% of total revenues, below the prior three year average of 14%.

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.

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The Company operates in four operating segments that, through aggregation, comprise two reportable segments: dredging and demolition. Four operating segments were aggregated into two reportable segments as the segments have similarity in economic margins, services, production processes, customer types, distribution methods and regulatory environment. The Company has determined that the operating segments are the Company’s four reporting units.

Results of Operations

The following tables set forth the components of net income attributable to Great Lakes Dredge & Dock Corporation and Adjusted EBITDA, as defined below, as a percentage of contract revenues for the three months ended March 31, 2013 and 2012:

	Three Months Ended March  31,
	2013			2012
Contract revenues		100.0	%		100.0	%
Costs of contract revenues		(86.3	)		(87.1	)
Gross profit		13.7			12.9
General and administrative expenses		10.2			8.5
(Gain) loss on sale of assets—net		—			—
Operating income		3.5			4.4
Interest expense—net		(3.0	)		(3.4	)
Equity in loss of joint ventures		(0.3	)		—
Gain on foreign currency transactions—net		—			—
Income before income taxes		0.2			1.0
Income tax (provision) benefit		0.1			(0.4	)
Net income		0.3			0.6
Net loss attributable to noncontrolling interests		—			0.1
Net income attributable to Great Lakes Dredge & Dock Corporation		0.3	%		0.7	%
Adjusted EBITDA		9.6	%		9.5	%

Adjusted EBITDA, as provided herein, represents net income attributable to Great Lakes Dredge & Dock Corporation, adjusted for net interest expense, income taxes, depreciation and amortization expense, debt extinguishment and accelerated maintenance expense for new international deployments. In 2012, the Company modified the Adjusted EBITDA calculation for accelerated maintenance expense for new international deployments that are not directly recoverable under the related dredging contract and are therefore expensed as incurred. The Company does not frequently incur significant accelerated maintenance as a part of its international deployments. As such, the exclusion of these accelerated maintenance expenses from the calculation of Adjusted EBITDA allows users of the financial statements to more easily compare our year-to-year results. This modification is not, however, relevant to Adjusted EBITDA calculations for the first quarter of 2012 or the first quarter of 2013. 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 accelerated maintenance expense for new international deployments, 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 attributable to Great Lakes Dredge & Dock Corporation:

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	Three Months Ended March 31,
	2013			2012
(in thousands)
Net income attributable to Great Lakes Dredge & Dock Corporation	$	433		$	1,068
Adjusted for:
Interest expense—net		5,733			5,259
Income tax provision (benefit)		(104	)		564
Depreciation and amortization		12,075			7,764
Adjusted EBITDA	$	18,137		$	14,655

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 March 31,
	2013		2012			Change
Revenues (in thousands)
Dredging:
Capital—U.S.	$	45,508	$	26,907			69.1	%
Capital—foreign		38,385		18,025			113.0	%
Coastal protection		56,921		31,183			82.5	%
Maintenance		27,764		40,545			(31.5	)%
Rivers & lakes		5,381		7,013			(23.3	)%
Total dredging revenues		173,959		123,673			40.7	%
Demolition		14,888		32,546			(54.3	)%
Intersegment revenue		—		(1,312	)		(100.0	)%
Total revenues	$	188,847	$	154,907			21.9	%

Total revenue for the 2013 first quarter was $188.8 million, up $33.9 million or 22% from $154.9 million during the 2012 first quarter. For the three months ended March 31, 2013, increases in coastal protection and domestic and foreign capital revenue were offset by decreases in maintenance and demolition revenue.

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 $18.6 million, or 69%, in the 2013 first quarter compared to the 2012 first quarter. Domestic capital dredging revenues in the quarter ended March 31, 2013 were driven by a costal restoration project in Louisiana as well as a deepening project in Delaware. These increases were slightly offset by a greater amount of work in the Port of New York/New Jersey in the first quarter of 2012.

Foreign dredging revenue increased $20.4 million, or 113%, for the first quarter of 2013 to $38.4 million. The first quarter 2013 foreign revenue was driven by the mobilization of the dredge New York and attendant plant for the Wheatstone LNG project in Western Australia as well as mobilization for a project in Brazil. The Company expects to commence dredging activities for these foreign capital projects in the second quarter of 2013.

Coastal protection projects involve moving sand from the ocean floor to shoreline locations where erosion threatens shoreline assets. Coastal protection revenue in the 2013 first quarter increased $25.7 million, or 83%, from the 2012 first quarter. The significant increase in coastal protection revenue in the first three months of 2013 was a result of a greater number of projects with higher contract values compared to the same period in 2012. In the 2013 first quarter, the Company worked on coastal protection projects in New York and New Jersey, which included some emergency work as a result of Superstorm Sandy, as well as projects in North Carolina and Florida.

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

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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 2013 first quarter decreased by $12.8 million, or 32%, compared to the 2012 first quarter. The Company performed a greater amount of harbor work in the first quarter 2012 that was not repeated in the first quarter of 2013. During the first quarter of 2013, the Company worked on projects in Florida, Maryland and Georgia.

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 first quarter of 2013 was $5.4 million, a decrease of $1.6 million or 23% compared to the first quarter of 2012. The decrease in the first quarter relates to a greater number of projects in first quarter of 2012, including a project in Mississippi that did not reoccur in the current year. Rivers and lakes revenues in the first quarter is typically lower due to freezing conditions in northern regions of the U.S. Rivers & lakes continued work on its large municipal lake project in Texas during the first quarter of 2013.

The Demolition segment which consists of demolition and remediation services recorded revenues of $14.9 million for the three months ended March 31, 2013 compared to $32.5 million for the same period in 2012. The decrease is attributable to a higher backlog at year end 2011, compared to 2012, which resulted in a greater number of projects for the demolition segment in the 2012 first quarter. In addition, the first quarter 2013 was negatively impacted by three projects that were delayed. This decrease was slightly offset by $6.1 million of revenue earned from the business acquired from Terra Contracting, LLC which did not become a part of the Company until the first quarter of 2013.

Consolidated gross profit for the 2013 first quarter increased 29% to $25.8 million, from $20.0 million in the first quarter of 2012. Gross profit margin (gross profit divided by revenue) for the 2013 first quarter increased to 13.7% from 12.9% in the 2012 first quarter. The increase in consolidated gross profit and gross profit margin in the 2013 first quarter is primarily the result of better weather conditions as the first quarter of 2012 was negatively impacted by offshore weather conditions, primarily wind that produced rough seas. This increase was partially offset by lower Demolition margins on fewer projects and Dredging mechanical delays experienced on a few projects during the first three months of 2013.

The Company’s general and administrative expenses totaled $19.2 million for the three months ended March 31, 2013 as compared to $13.3 million for the three months ended March 31, 2012. In the first quarter of 2013, the Company incurred additional payroll and benefit expenses, representing an increase of $1.4 million over the same period in the prior year. General and administrative expenses of $1.7 million related to the business acquired in the Terra acquisition also contributed to the increase as the business did not become a part of the Company until the first quarter of 2013. An increase in legal and professional fees of $1.2 million and additional bad debt expense of $1.0 million increased general and administrative expenses in the three months ended March 31, 2013 over the comparable period in 2012.

Operating income for the three months ended March 31, 2013 decreased by $0.2 million or 3% from $6.8 million in the same period of 2012 as higher operating margin was offset by increased general and administrative expenses described above.

The Company’s net interest expense totaled $5.7 million for the three months ended March 31, 2013, in line with interest expense of $5.3 million for the first three months of 2012.

Income tax expense for the three months ended March 31, 2013 was a benefit of $0.1 million, compared to $0.6 million of provision for the same 2012 period. The effective tax rate for the three months ended March 31, 2013 was 33.9%, which is lower than the effective tax rate of 37.2% for the same period of 2012. The first quarter 2013 benefited from credits allowed in the 2012 tax return that were not reflected in the 2012 provision. The Company expects the tax rate for the full year to remain near 39%.

Net income attributable to Great Lakes Dredge & Dock Corporation was $0.4 million and the earnings per diluted share was $0.01 for the 2013 first quarter compared to net income attributable to Great Lakes Dredge & Dock Corporation of $1.1 million and earnings per share of $0.02 for the same 2012 period. The decrease in 2013 is due to the decrease in operating income for the three months ended March 31, 2013.

Adjusted EBITDA (as defined on page 23) was $18.1 million for the three months ended March 31, 2013 compared with $14.7 million in the same 2012 period, as increased depreciation expense in 2013 as a result of significant capital expenditures during 2012 negatively impacted operating income, but is excluded from Adjusted EBITDA.

Results by segment

Dredging

Dredging revenues for the three months ended March 31, 2013 were $174.0 million, compared to $122.4 million for the same period of 2012. The dredging segment for the three months ended March 31, 2013 experienced increases in coastal protection revenue as well as domestic and foreign capital revenue, partially offset by lower maintenance revenues. Increases in dredging revenue for the three months were driven by vessel mobilizations for the Wheatstone LNG project in Western Australia and a separate project in Brazil as well as a significant coastal restoration project in Louisiana.

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Gross profit margin in the dredging segment was 18.0% for the three months ended March 31, 2013 compared to gross profit margin in the dredging segment of 13.0% for the three months ended March 31, 2012. The increase in dredging gross profit margin is a result poor offshore weather conditions during the first quarter of 2012 that negatively impacted gross profit margin, partially offset by mechanical delays experienced on a few projects.

Dredging segment operating income was $19.0 million for the three months ended March 31, 2013, compared to operating income of $4.9 million for the three months ended March 31, 2012. The increase in operating income for the three months ended March 31, 2013 is a result of the increase in gross profit in the first quarter of 2013, as mentioned above, slightly offset by an increase in general and administrative expenses.

Demolition

Demolition revenues for the three months ended March 31, 2013 totaled $14.9 million, compared to $32.5 million for the same 2012 period. Demolition revenues for the 2013 first quarter were down due to a lower backlog at year end 2012, resulting in fewer projects on which to earn revenue in the first quarter of 2013 compared to the same period in 2012. In addition, the first quarter 2013 was negatively impacted by three projects that were delayed. These decreases were partially offset by $2.0 million of revenue recognized from customer acceptance of pending change orders and $6.1 million of revenue earned from the business acquired from Terra Contracting, LLC that was part of the Company only during the first quarter of 2013.

The demolition segment had a negative gross profit margin of 36.8% for the three months ended March 31, 2013 and a gross profit margin of 12.5% for the three months ended March 31, 2012. During the first quarter 2013, the demolition segment experienced cost overruns on projects. The demolition segment generated an operating loss of $12.4 million for the three months ended March 31, 2013, compared to operating income of $1.8 million for the same period of 2012. This decrease in operating income and increase in the operating loss was due to the negative gross profit margin described above as well as an increase in general and administrative expenses.

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:

	March 31,		December 31,			March 31,
	2013		2012			2012
Backlog (in thousands)
Dredging:
Capital—U.S.	$	103,061	$	43,177		$	151,479
Capital—foreign		195,292		218,953			247,257
Coastal protection		33,978		80,245			70,767
Maintenance		2,211		22,406			22,166
Rivers & lakes		26,339		24,510			32,273
Dredging Backlog		360,881		389,291			523,942
Demolition		56,651		60,148	*		60,427
Total Backlog	$	417,532	$	449,439		$	584,369

* December 31, 2012 demolition backlog includes backlog acquired by the Company on December 31, 2012 in connection with the Terra acquisition.

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. Also, 27% of the Company’s March 31, 2013 dredging backlog relates to federal government contracts, which can be canceled at any time without penalty to the government, subject to the Company’s contractual right to recover the Company’s actual committed costs and profit on work performed up to the date of cancellation. The Company’s backlog may fluctuate significantly from quarter to quarter based upon the type and size of the projects the Company is awarded from the bid market. A quarterly increase or decrease of the Company’s backlog does not necessarily result in an improvement or a deterioration of the Company’s business. The Company’s backlog includes only those projects for which the Company has obtained a signed contract with the customer.

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The domestic dredging bid market for the 2013 first quarter was $229.1 million, a small decrease of $0.5 million from the same period in the prior year. The bid market in the first quarter of 2013 was slightly lower than the same period in the prior year as there were larger contract value domestic capital projects let to bid by governmental agencies, offset by fewer contracts for coastal protection and rivers & lakes projects. For the contracts released in the 2013 first quarter, the Company won 9%, or $3.9 million, of the maintenance projects and 66%, or $109.7 million, of the domestic capital projects awarded year to date through March 31, 2013. The Company won 52% of the overall domestic bid market through March 31, 2013, which is above the Company’s prior three year average of 37%. 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 $360.9 million at March 31, 2013 compared to $389.3 million as of December 31, 2012. Dredging backlog decreased $28.4 million or 7% as the Company continued to earn revenue on several of the projects in backlog at year end, partially offset by new awards, especially in the domestic capital bid market. These amounts do not reflect approximately $18.0 million of domestic low bids pending formal award and additional phases (“options”) pending on projects currently in backlog at March 31, 2013. At December 31, 2012 the amount of domestic low bids and options pending award was $82.1 million.

Domestic capital dredging backlog at March 31, 2013 was $59.9 million greater than at December 31, 2012 as progress on the Company’s capital projects in Louisiana converted backlog into revenue and the Company was awarded new projects in Louisiana and New York/New Jersey during the quarter to add over $100 million to domestic capital backlog. The Company continues to anticipate a strong capital dredging bid market over the next twelve months. In January 2013, the Corps released for proposal the Port of Miami harbor deepening with the expectation of an award date in the second quarter of 2013. The Company expects several East Coast ports to continue their planning efforts to deepen in anticipation of larger draft vessels from international trade.

Coastal protection dredging backlog at March 31, 2013 was $46.3 million lower than at December 31, 2012 as the Company substantially completed two projects on the East Coast and one in Southern California. Another project in New Jersey partially completed the scope of work in backlog at year end 2012, but was given new options on work that adds to its backlog at the end of the quarter. Superstorm Sandy impacted the East Coast of the U.S. in October 2012 and the government has appropriated $50.5 billion, including nearly $4 billion for Corps projects to assist the needed relief for the region. In addition, the Corps is expected to let for bid projects for East Coast markets from this funding throughout 2013.

Maintenance dredging backlog was $20.2 million less at March 31, 2013 than at December 31, 2012 as no significant projects were awarded in the quarter and the Company completed all but one of the projects in its backlog at year end.

Rivers & lakes backlog is $1.8 million higher at March 31, 2013 than at December 31, 2012. Rivers & lakes projects in Texas and the Mississippi River were executed in the quarter. The Corps awarded the Company an option to the work it is performing on the Mississippi River. Rivers & lakes continues to have projects in Florida, Texas, Louisiana and on the Mississippi River and its tributaries in backlog that are expected to be converted into revenue during 2013.

Foreign capital dredging backlog decreased $23.7 million to $195.3 million at March 31, 2013 from December 31, 2012, due to significant work on projects in backlog from the Middle East and mobilization of the dredge New York to the Wheatstone LNG project in Western Australia and mobilization of a mechanical dredge for a contract in Brazil. The Company continues to pursue opportunities in the Middle East, Southwest Pacific and South America for the vessels that are currently deployed in these international regions.

Demolition services backlog was $3.5 million lower at March 31, 2013 from December 31, 2012. The current quarter includes backlog of approximately $4 million from the newly acquired Terra. Work on existing projects in New York, New England and the Midwest earned revenue from projects in backlog at year end 2012. Backlog was partially replenished with new contracts for work in New England.

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 Company cannot predict the outcome of the appellate process. For additional information regarding this matter, see Note 8 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.

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The Company’s net cash used in operating activities for the three months ended March 31, 2013 and 2012 totaled $13.2 million, and $18.2 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 three months of 2013, the decrease in net cash used in operating activities was primarily the result of higher adjusted EBITDA in the three months ended March 31, 2013 as compared to the same period in the prior year.

The Company’s net cash flows used in investing activities for the first three months of 2013 and 2012 totaled $15.5 million and $8.0 million, respectively. Investing activities in both periods primarily relate to normal course upgrades and capital maintenance of the Company’s dredging fleet. The Company spent $9.4 million on construction in progress for vessels being built to our specifications that we intend to have funded through operating lease upon delivery.

The Company’s net cash flows provided by (used in) financing activities for the three months ended March 31, 2013 and 2012 totaled $10.9 million and $(1.4) million, respectively. Increases were primarily due to net borrowings on the Company’s revolver during the first quarter 2013 of $21.5 million. The Company also paid $10.5 million on a promissory note related to the Terra acquisition.

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 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 Credit Agreement requires the Company to maintain a net leverage ratio less than or equal to 4.50 to 1.00 as of the end of each fiscal quarter and a minimum fixed charge coverage ratio of 1.25 to 1.00. At December 31, 2012, the Company’s fixed charge coverage ratio was 1.12x, resulting in an event of default under the Credit Agreement.

On March 15, 2013, the Company executed a Waiver and Amendment No. 2 to the Credit Agreement (the “Credit Agreement Waiver and Amendment”) pursuant to which the counterparties thereto agreed, among other things, to waive any default, event of default, or possible event of default, as applicable, related to the Company’s failure to meet the above-described financial covenant in the Credit Agreement.

Separately, the Company determined that a perfection trigger event had occurred under the Credit Agreement as of December 31, 2012. As a result, the outstanding obligations under the Credit Agreement, which were previously unsecured, are now secured by liens on certain of the Company’s vessels and all of its domestic accounts receivable, subject to the liens and interests of certain other parties holding first priority perfected liens. Under the original terms of the Credit Agreement, the obligations thereunder that became secured under these circumstances could again become unsecured provided that (i) no event of default has occurred and is continuing and (ii) the Company has maintained for two consecutive quarters, and is projected to maintain for the next two consecutive quarters, a total leverage ratio less than or equal to 3.75 to 1.0. Pursuant to the Credit Agreement Waiver and Amendment, this provision has been amended to add the additional condition that no release of the liens securing the obligations under the Credit Agreement can occur until the Company has delivered to the lenders its audited financial statements with respect to its fiscal year ending December 31, 2013.

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 March 31, 2013, the Company had $21.5 million of borrowings on the revolver and $33.4 million of letters of credit outstanding, resulting in $120.1 million of availability under the Credit Agreement. At March 31, 2013, the Company was in compliance with its various covenants under its Credit Agreement.

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 March 31, 2013.

28

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 loss. Cash held in non-U.S. dollar currencies primarily is used for project-related and other operating costs in those currencies reducing the Company’s exposure to future realized exchange gains and losses.

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

Critical Accounting Policies and Estimates

In preparing its consolidated financial statements, the Company follows 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, 2012.

29

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

The market risk of the Company’s financial instruments as of March 31, 2013 has not materially changed since December 31, 2012. The market risk profile of the Company on December 31, 2012 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, 2012.

30

Item 4. Controls and Procedures.

a) Evaluation of disclosure controls and procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Company’s disclosure controls and procedures, as required by Rule 13a-15(b) and 15d-15(b) under the Securities Exchange Act of 1934 (the “Exchange Act”) as of March 31, 2013. Our disclosure controls and procedures are designed to provide reasonable assurance that information required to be disclosed in the reports that we file or submit under the Exchange Act a) is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding disclosure and b) is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

Our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were not effective in providing such a reasonable assurance as a result of the identified material weakness in internal control over financial reporting as further described in Item 9A. “Controls and Procedures” of our Annual Report on Form 10-K for the year ended December 31, 2012. Notwithstanding the material weakness, management has concluded that the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q present fairly, in all material respects, the Company’s financial position, results of operations and cash flows in conformity with generally accepted accounting principles.

b) Changes in internal control over financial reporting.

Other than described below, 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 March 31, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Management has developed a remediation plan to address the internal control deficiencies described above. Our plan was designed to ensure that each area affected by a material control weakness was remediated properly. The remediation plan included the following actions:

• A comprehensive review of the organizational resources at our demolition segment, focused on the project management and accounting functions, to determine the appropriate level of staffing and skills and to ensure those resources are put in place.

• The finance team at the demolition segment will report directly to the corporate finance function, instead of divisional leadership.

• Increasing the level of resources in the accounting, internal audit and compliance functions at the corporate office.

• Evaluating information technology systems in our demolition segment to ensure timely and accurate information is available for period-end reporting and analysis. The Company is currently installing new estimating and project management software at its demolition segment.

• Training all appropriate demolition segment and corporate accounting personnel regarding the application of the Company’s accounting policy regarding revenue recognition.

Management is in the process of remediating the internal control deficiency. The remediation plan is being administered by the Chief Financial Officer and involves key leaders from across the organization, including the Chief Executive Officer and Chief Legal Officer.

31

PART II — Other Information

Item 1. Legal Proceedings.

See Note 8 “Commitments and Contingencies” in the Notes to Condensed Consolidated Financial Statements.

Item 1A. Risk Factors.

There have been no material changes during the three months ended March 31, 2013 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, 2012.

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.

32

Item 6. Exhibits

10.1	Waiver and Amendment No. 2 to Credit Agreement, dated as of March 15, 2013, by and among Great Lakes Dredge & Dock Corporation, the other Credit Parties party thereto, Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender and an Issuing Lender, and the other lenders party thereto. (1)
10.2	Waiver to International Letter of Credit Agreement, dated as of March 15, 2013, to the International Letter of Credit Agreement, by and among Great Lakes Dredge & Dock Corporation, Great Lakes Dredge & Dock Company, LLC and Wells Fargo Bank, National Association. (1)
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. *

(1) Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on March 19, 2012 (Commission file no. 001-33225).

* Filed herewith.

33

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: May 8, 2013

34

EXHIBIT INDEX

Number	Document Description
10.1	Waiver and Amendment No. 2 to Credit Agreement, dated as of March 15, 2013, by and among Great Lakes Dredge & Dock Corporation, the other Credit Parties party thereto, Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender and an Issuing Lender, and the other lenders party thereto. (1)
10.2	Waiver to International Letter of Credit Agreement, dated as of March 15, 2013, to the International Letter of Credit Agreement, by and among Great Lakes Dredge & Dock Corporation, Great Lakes Dredge & Dock Company, LLC and Wells Fargo Bank, National Association. (1)
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. *

(1) Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on March 19, 2012 (Commission file no. 001-33225).

* Filed herewith.

35

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 evaluation; and

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

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

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

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

Date: May 8, 2013

/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 evaluation; and

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

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

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

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

Date: May 8, 2013

/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 March 31, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jonathan W. Berger, Chief Executive Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(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: May 8, 2013

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 March 31, 2013, 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 of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(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: May 8, 2013

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

XML

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Contract revenues	$ 188,847	$ 154,907	$ 154,907
Costs of contract revenues	(163,064)	(134,885)	(134,885)
GROSS PROFIT	25,783	20,022	20,022
General and administrative expenses	19,187	13,267	13,267
Gain on sale of assets-net	2	(31)	(31)
Total operating income	6,594	6,786	6,786
Interest expense-net	(5,733)	(5,259)	(5,259)
Equity in earnings (loss) of joint ventures	(590)	(16)	(16)
Loss on foreign currency transactions-net	36	6	6
INCOME BEFORE INCOME TAXES	307	1,517	1,517
Income tax (provision) benefit	104	(564)	(564)
NET INCOME	411	953	953
Net (income) loss attributable to noncontrolling interests	22	115	115
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	433	1,068	1,068
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	444		1,546
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
General and administrative expenses			512
Gain on sale of assets-net			11
Total operating income			(512)
Interest expense-net	(5,672)		(4,950)
Equity in earnings (loss) of subsidiaries	9,556		6,347
INCOME BEFORE INCOME TAXES	3,884		885
Income tax (provision) benefit	(3,473)		79
NET INCOME	411		964
Net (income) loss attributable to noncontrolling interests	22		115
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	433		1,079
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	444		1,546
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	185,419		155,444
Costs of contract revenues	(159,932)		(135,167)
GROSS PROFIT	25,487		20,277
General and administrative expenses	18,996		12,569
Gain on sale of assets-net	2		(42)
Total operating income	6,489		7,750
Interest expense-net	(19)		(281)
Equity in earnings (loss) of subsidiaries	(47)		(379)
Equity in earnings (loss) of joint ventures	(590)		(16)
Loss on foreign currency transactions-net	36		6
INCOME BEFORE INCOME TAXES	5,869		7,080
Income tax (provision) benefit	3,577		(643)
NET INCOME	9,446		6,437
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	9,446		6,437
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	9,463		6,911
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	3,759		1,799
Costs of contract revenues	(3,463)		(2,054)
GROSS PROFIT	296		(255)
General and administrative expenses	191		186
Total operating income	105		(441)
Interest expense-net	(42)		(28)
INCOME BEFORE INCOME TAXES	63		(469)
NET INCOME	63		(469)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	63		(469)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	57		(465)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Contract revenues	(331)		(2,336)
Costs of contract revenues	331		2,336
Equity in earnings (loss) of subsidiaries	(9,509)		(5,968)
INCOME BEFORE INCOME TAXES	(9,509)		(5,968)
NET INCOME	(9,509)		(5,968)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	(9,509)		(5,968)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$ (9,520)		$ (6,446)

XML

Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accrued Expenses [Abstract]
Insurance	$ 10,139	$ 9,070
Payroll and employee benefits	9,560	9,906
Construction liabilities	9,423	6,426
Interest	3,401	7,837
Income and other taxes	1,903	1,699
Plant & overhead accrual	1,898
Percentage of completion adjustment	1,719	1,552
Other	2,518	2,000
Total accrued expenses	$ 40,561	$ 38,490

XML

Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0	0	0
Net income (loss) attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$ 433	$ 1,068				$ 1,068
Weighted-average common shares outstanding - basic	59,369	59,038
Effect of stock options and restricted stock units	648	396
Weighted-average common shares outstanding - diluted	60,017	59,434
Earnings per share - basic	$ 0.01	$ 0.02
Earnings per share - diluted	$ 0.01	$ 0.02
Parent Company [Member]
Net income (loss) attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$ 433					$ 1,079

XML

Subsidiary Guarantors (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Jan. 31, 2011
Subsidiary Guarantors [Abstract]
Senior Notes	$ 250,000	$ 250,000	$ 250,000
Senior notes interest rate	7.375%		7.375%

XML

Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 411	$ 953
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	12,075	7,764
Equity in (earnings) loss of joint ventures	590	16
Deferred income taxes	(2,585)	107
Gain on dispositions of property and equipment	2	(31)
Amortization of deferred financing fees	288	334
Unrealized foreign currency loss	41	(133)
Share-based compensation expense	751	1,015
Excess income tax benefit from share based compensation	(15)	(27)
Changes in assets and liabilities:
Accounts receivable	8,408	(1,842)
Contract revenues in excess of billings	(4,351)	(5,819)
Inventories	3,066	(1,869)
Prepaid expenses and other current assets	1,343	(7,399)
Accounts payable and accrued expenses	(30,695)	(21,263)
Billings in excess of contract revenues	(1,751)	10,126
Other noncurrent assets and liabilities	(810)	(176)
Net cash flows provided by (used in) by operating activities	(13,232)	(18,244)
INVESTING ACTIVITIES:
Purchases of property and equipment	(15,514)	(8,101)
Proceeds from dispositions of property and equipment	58	68
Net cash flows used in investing activities	(15,456)	(8,033)
FINANCING ACTIVITIES:
Repayment of long term note payable	(10,547)
Dividends paid		(1,240)
Dividend equivalents paid on restricted stock units		(12)
Taxes paid on settlement of vested share awards	(28)	(2)
Repayments of equipment debt	(25)	(238)
Exercise of stock options		40
Excess income tax benefit from share-based compensation	15	27
Borrowings under revolving loans	79,500
Repayments of revolving loans	(58,000)
Net cash flows provided by (used in) financing activities	10,915	(1,425)
Effect of foreign currency exchange rates on cash and cash equivalents	(24)	32
Net increase (decrease) in cash and cash equivalents	(17,797)	(27,670)
Cash and cash equivalents at beginning of period	24,440	24,440
Cash and cash equivalents at end of period	6,643	85,618
Supplemental Cash Flow Information
Cash paid for interest	9,881	9,582
Cash paid (refunded) for income taxes	241	(2,926)
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 6,253	$ 4,957

XML

Fair Value Measurements (Fair Value Measurements at Reporting Date Using) (Details) (Fuel Hedge Contracts [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Liabilities, fair value disclosure	$ 150	$ 178
Fair Value, Inputs, Level 2 [Member]
Liabilities, fair value disclosure	$ 150	$ 178

XML

Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Jan. 31, 2011
Derivative underlying hedge percent	80.00%
Derivative, nonmonetary notional amount	2.0
Senior Notes	$ 250,000	$ 250,000	$ 250,000
Reclassification of derivative losses to earnings-net of tax	(137)
Fair value hedge liabilities	150	178
Senior notes interest rate	7.375%		7.375%
Maximum [Member]
Fixed price range	3.26
Minimum [Member]
Fixed price range	3.01
Parent Company [Member]
Senior Notes	250,000	250,000
Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Senior Notes	$ 263,750

XML

Fair Value Measurements (Balance Sheet Location) (Details) (Fuel Hedge Contracts [Member], Designated as Hedging Instrument [Member], Accrued Liabilities [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fuel Hedge Contracts [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivative asset, fair value, gross liability	$ 150	$ 178

XML

Fair Value Measurements (Accumulated Other Comprehensive adjustments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Fair Value Measurements [Abstract]
Cumulative translation adjustments-net of tax	$ (6)		$ 4
Reclassification of derivative losses (gains) to earnings-net of tax	137		(406)
Net unrealized gain on derivatives-net of tax	(120)		880
Net unrealized gain on derivatives-net of tax	17	[1]	474	[1]
Other comprehensive loss-net of tax	$ 11		$ 478

[1] Net of income tax benefit of $11 and $315 for the three months ended March 31, 2013 and 2012, respectively.

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Consolidated Statements Of Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2012
Consolidated Statements Of Equity [Abstract]
Dividends declared per share	$ 0.02

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Fair Value Measurement ( Other Comprehensive Income to Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Costs of contract revenues	$ 163,064	$ 134,885	$ 134,885
Income tax provision	(104)	564	564
Net income	411	953	953
Parent Company [Member]
Income tax provision	3,473		(79)
Net income	411		964
Fuel Hedge Contracts [Member]
Costs of contract revenues	228	(675)
Income tax provision	(91)	269
Net income	$ 137	$ (406)

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Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2011	Mar. 31, 2013 Parent Company [Member]	Sep. 30, 2011 Parent Company [Member]	Mar. 31, 2013 Subsidiary Guarantors [Member]	Sep. 30, 2011 Subsidiary Guarantors [Member]	Dec. 31, 2011 Subsidiary Guarantors [Member]	Mar. 31, 2013 Non-Guarantor Subsidiaries [Member]	Sep. 30, 2011 Non-Guarantor Subsidiaries [Member]	Dec. 31, 2011 Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net cash flows provided by (used in) by operating activities	$ (13,232)	$ (18,244)	$ (18,244)	$ (2,952)	$ (13,845)	$ (10,786)	$ (5,200)		$ 506	$ 801
INVESTING ACTIVITIES:
Purchases of property and equipment	(15,514)	(8,101)	(8,101)			(15,514)	(8,101)
Proceeds from dispositions of property and equipment	58	68	68			58	68
Net cash flows used in investing activities	(15,456)	(8,033)	(8,033)			(15,456)	(8,033)
FINANCING ACTIVITIES:
Repayment of long term note payable	(10,547)
Dividends paid		(1,240)	(1,240)		(1,240)
Dividend equivalents paid on restricted stock units		(12)	(12)		(12)
Taxes paid on settlement of vested share awards	(28)	(2)	(2)	(28)	(2)
Net change in accounts with affiliates				(7,988)	15,067	8,331	(10,089)		(343)	(4,978)
Capital contributions					(35)					35
Repayments of equipment debt	(25)	(238)	(238)			(25)	(238)
Exercise of stock options		40	40		40
Borrowings under revolving loans	79,500
Repayments of revolving loans	(58,000)
Excess income tax benefit from share-based compensation	15	27	27	15	27
Net cash flows provided by (used in) financing activities	10,915	(1,425)	(1,425)	2,952	13,845	8,306	(10,327)		(343)	(4,943)
Effect of foreign currency exchange rates on cash and cash equivalents	(24)	32	32						(24)	32
Net increase (decrease) in cash and cash equivalents	(17,797)	(27,670)	(27,670)			(17,936)	(23,560)		139	(4,110)
Cash and cash equivalents at beginning of period	24,440	24,440	113,288			24,272	108,985	24,272	168	4,303	168
Cash and cash equivalents at end of period	$ 6,643	$ 85,618	$ 85,618			$ 6,336	$ 85,425	$ 24,272	$ 307	$ 193	$ 168

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 6,643	$ 24,440
Accounts receivable-net	141,250	149,142
Contract revenues in excess of billings	73,916	69,574
Inventories	26,629	28,726
Prepaid Expense and Other Assets, Current	40,479	41,808
Total current assets	288,917	313,690
PROPERTY AND EQUIPMENT-Net	347,740	346,540
GOODWILL AND OTHER INTANGIBLE	103,967	104,031
INVENTORIES-Noncurrent	36,423	37,392
INVESTMENTS IN JOINT VENTURES	6,457	7,047
OTHER	17,509	17,695
TOTAL	801,013	826,395
CURRENT LIABILITIES:
Accounts payable	88,624	123,082
Accrued expenses	40,561	38,490
Billings in excess of contract revenues	9,529	11,280
Current portion of long term debt	2,526	13,098
Total current liabilities	141,240	185,950
7 3/8% SENIOR NOTES	250,000	250,000
Line of Credit Facility, Amount Outstanding	21,500
DEFERRED INCOME TAXES	103,436	106,767
OTHER	10,252	10,253
Total liabilities	526,428	552,970
EQUITY:
Common stock-$.0001 par value; 90,000 authorized, 59,359 and 58,999 shares issued and outstanding at December 31, 2012 and December 31, 2011, respectively.	6	6
Additional paid-in capital	272,156	271,418
Retained earnings	3,024	2,591
Accumulated other comprehensive income (loss)	(369)	(380)
Total Great Lakes Dredge & Dock Corporation equity	274,817	273,635
NONCONTROLLING INTERESTS	(232)	(210)
Total equity	274,585	273,425
TOTAL	$ 801,013	$ 826,395

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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ (4)	$ 0	$ 3	$ 0	$ (3)	$ 0
Net unrealized gain on derivatives-net of tax	11	(56)	315	(295)	(231)	(830)
Change in fair value of derivatives, tax		$ 549		$ (246)	$ (132)	$ (313)

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Contract revenues	$ 188,847	$ 154,907	$ 154,907
Operating income (loss)	6,594	6,786	6,786
Intersegment revenues		(1,312)
Foreign [Member]
Contract revenues	38,385	18,025
Dredging [Member]
Contract revenues	173,959	123,673
Operating income (loss)	19,000	4,899
Demolition [Member]
Contract revenues	14,888	32,546
Operating income (loss)	(12,406)	1,887
Parent Company [Member]
Operating income (loss)			$ (512)

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Subsidiary Guarantors (Tables)

3 Months Ended

9 Months Ended

12 Months Ended

Mar. 31, 2013

Sep. 30, 2011

Dec. 31, 2012

Subsidiary Guarantors [Abstract]

Condensed Consolidating of Balance Sheet

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF MARCH 31, 2013
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	6,336	$	307	$	-	$	-	$	6,643
Accounts receivable — net		137,857		3,393		-		-		141,250
Receivables from affiliates		87,422		5,982		3,514		(96,918)		-
Contract revenues in excess of billings		73,450		534		-		(68)		73,916
Inventories		26,629		-		-		-		26,629
Prepaid expenses and other current assets		29,326		20		11,133		-		40,479
Total current assets		361,020		10,236		14,647		(96,986)		288,917
PROPERTY AND EQUIPMENT—Net		347,706		34		-		-		347,740
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		103,633		334		-		-		103,967
INVENTORIES — Noncurrent		36,423		-		-		-		36,423
INVESTMENTS IN JOINT VENTURES		6,457		-		-		-		6,457
INVESTMENTS IN SUBSIDIARIES		2,081		-		650,100		(652,181)		-
OTHER		11,444		3		6,062		-		17,509
TOTAL	$	868,764	$	10,607	$	670,809	$	(749,167)	$	801,013
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	86,909	$	1,310	$	405	$	-	$	88,624
Payables to affiliates		75,529		4,720		16,525		(96,774)		-
Accrued expenses		35,980		726		3,855		-		40,561
Billings in excess of contract revenues		9,474		267		-		(212)		9,529
Current portion of long term debt		2,526		-		-		-		2,526
Total current liabilities		210,418		7,023		20,785		(96,986)		141,240
7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
REVOLVING CREDIT FACILITY		-		-		21,500		-		21,500
DEFERRED INCOME TAXES		45		-		103,391		-		103,436
OTHER		9,704		-		548		-		10,252
Total liabilities		220,167		7,023		396,224		(96,986)		526,428
Total Great Lakes Dredge & Dock Corporation Equity		648,597		3,584		274,817		(652,181)		274,817
NONCONTROLLING INTERESTS		-		-		(232)		-		(232)
TOTAL EQUITY		648,597		3,584		274,585		(652,181)		274,585
TOTAL	$	868,764	$	10,607	$	670,809	$	(749,167)	$	801,013

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2012
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	24,272	$	168	$	-	$	-	$	24,440
Accounts receivable — net		147,610		1,532		-		-		149,142
Receivables from affiliates		102,968		7,680		38,115		(148,763)		-
Contract revenues in excess of billings		69,649		5		-		(80)		69,574
Inventories		28,726		-		-		-		28,726
Prepaid expenses and other current assets		27,147		28		14,633		-		41,808
Total current assets		400,372		9,413		52,748		(148,843)		313,690
PROPERTY AND EQUIPMENT—Net		346,503		37		-		-		346,540
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		103,687		344		-		-		104,031
INVENTORIES — Noncurrent		37,392		-		-		-		37,392
INVESTMENTS IN JOINT VENTURES		7,047		-		-		-		7,047
INVESTMENTS IN SUBSIDIARIES		2,127		-		618,070		(620,197)		-
OTHER		11,350		2		6,343		-		17,695
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	122,191	$	891	$	-	$	-	$	123,082
Payables to affiliates		105,303		4,843		38,647		(148,793)		-
Accrued expenses		29,417		677		8,396		-		38,490
Billings in excess of contract revenues		11,207		123		-		(50)		11,280
Current portion of long term debt		13,098		-		-		-		13,098
Total current liabilities		281,216		6,534		47,043		(148,843)		185,950
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		623		-		106,144		-		106,767
OTHER		9,704		-		549		-		10,253
Total liabilities		291,543		6,534		403,736		(148,843)		552,970
Total Great Lakes Dredge & Dock Corporation Equity		616,935		3,262		273,635		(620,197)		273,635
NONCONTROLLING INTERESTS		-		-		(210)		-		(210)
TOTAL EQUITY		616,935		3,262		273,425		(620,197)		273,425
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395

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 MARCH 31, 2013
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	185,419	$	3,759	$	-	$	(331)	$	188,847
Costs of contract revenues		(159,932)		(3,463)		-		331		(163,064)
Gross profit		25,487		296		-		-		25,783
OPERATING EXPENSES:
General and administrative expenses		18,996		191		-		-		19,187
(Gain) loss on sale of assets—net		2		-		-		-		2
Operating income (loss)		6,489		105		-		-		6,594
Interest expense—net		(19)		(42)		(5,672)		-		(5,733)
Equity in earnings (loss) of subsidiaries		(47)		-		9,556		(9,509)		-
Equity in earnings of joint ventures		(590)		-		-		-		(590)
Gain on foreign currency transactions—net		36		-		-		-		36
Income (loss) before income taxes		5,869		63		3,884		(9,509)		307
Income tax (provision) benefit		3,577		-		(3,473)		-		104
Net income (loss)		9,446		63		411		(9,509)		411
Net loss attributable to noncontrolling interests		-		-		22		-		22
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	9,446	$	63	$	433	$	(9,509)	$	433
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	9,463	$	57	$	444	$	(9,520)	$	444

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED MARCH 31, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	155,444	$	1,799	$	-	$	(2,336)	$	154,907
Costs of contract revenues		(135,167)		(2,054)		-		2,336		(134,885)
Gross profit		20,277		(255)		-		-		20,022
OPERATING EXPENSES:
General and administrative expenses		12,569		186		512		-		13,267
(Gain) loss on sale of assets—net		(42)		-		11		-		(31)
Operating income (loss)		7,750		(441)		(512)		-		6,786
Interest expense—net		(281)		(28)		(4,950)		-		(5,259)
Equity in earnings (loss) of subsidiaries		(379)		-		6,347		(5,968)		-
Equity in earnings of joint ventures		(16)		-		-		-		(16)
Loss on foreign currency transactions, net		6		-		-		-		6
Income (loss) before income taxes		7,080		(469)		885		(5,968)		1,517
Income tax (provision) benefit		(643)		-		79		-		(564)
Net income (loss)		6,437		(469)		964		(5,968)		953
Net income attributable to noncontrolling interests		-		-		115		-		115
Net income (loss) attributable to Great Lakes  Dredge & Dock Corporation	$	6,437	$	(469)	$	1,079	$	(5,968)	$	1,068
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	6,911	$	(465)	$	1,546	$	(6,446)	$	1,546

Condensed Consolidating of Cash Flows

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(5,200)	$	801	$	(13,845)	$	-	$	(18,244)
INVESTING ACTIVITIES:
Purchases of property and equipment		(8,101)		-		-		-		(8,101)
Proceeds from dispositions of property and equipment		68		-		-		-		68
Net cash flows used in investing activities		(8,033)		-		-		-		(8,033)
FINANCING ACTIVITIES:
Dividends paid		-		-		(1,240)		-		(1,240)
Dividend equivalents paid on restricted stock units		-		-		(12)		-		(12)
Taxes paid on vested share awards		-		-		(2)				(2)
Net change in accounts with affiliates		(10,089)		(4,978)		15,067		-		-
Capital contributions		-		35		(35)		-		-
Repayments of equipment debt		(238)		-		-		-		(238)
Exercise of stock options		-		-		40		-		40
Excess income tax benefit from share-based compensation		-		-		27		-		27
Net cash flows provided by financing activities		(10,327)		(4,943)		13,845		-		(1,425)
Effect of foreign currency exchange rates on cash and cash equivalents		-		32		-		-		32
Net increase in cash and cash equivalents		(23,560)		(4,110)		-		-		(27,670)
Cash and cash equivalents at beginning of period		108,985		4,303		-		-		113,288
Cash and cash equivalents at end of period	$	85,425	$	193	$	-	$	-	$	85,618

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2013
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(10,786)	$	506	$	(2,952)	$	-	$	(13,232)
INVESTING ACTIVITIES:
Purchases of property and equipment		(15,514)		-		-		-		(15,514)
Proceeds from dispositions of property and equipment		58		-		-		-		58
Net cash flows used in investing activities		(15,456)		-		-		-		(15,456)
FINANCING ACTIVITIES:
Repayments of long term note payable		-		-		(10,547)		-		(10,547)
Taxes paid on settlement of vested share awards		-		-		(28)		-		(28)
Net change in accounts with affiliates		8,331		(343)		(7,988)		-		-
Repayments of equipment debt		(25)		-		-		-		(25)
Excess income tax benefit from share-based compensation		-		-		15		-		15
Borrowings under revolving loans		-		-		79,500		-		79,500
Repayments of revolving loans		-		-		(58,000)		-		(58,000)
Net cash flows provided by (used in) financing activities		8,306		(343)		2,952		-		10,915
Effect of foreign currency exchange rates on cash and cash equivalents		-		(24)		-		-		(24)
Net decrease in cash and cash equivalents		(17,936)		139		-		-		(17,797)
Cash and cash equivalents at beginning of period		24,272		168		-		-		24,440
Cash and cash equivalents at end of period	$	6,336	$	307	$	-	$	-	$	6,643

XML

Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Jan. 31, 2011	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2012 Maximum [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2012 Minimum [Member]	Mar. 31, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]
Letters of credit outstanding	$ 33,420
Letter of credit remaining borrowing capacity	120,080
Senior notes interest rate	7.375%		7.375%
Bids bond range				10,000		1,000
Outstanding performance bonds	612,677
Revenue value remaining from outstanding performance bonds	186,754
Senior Notes	250,000	250,000	250,000					250,000	250,000
Judgement					$ 13,272		$ 11,736

XML

Nature Of Business And Summary Of Significant Accounting Policies (Effects of Restatement of Certain Line items) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2011	Dec. 31, 2012
CURRENT ASSETS:
Accounts receivable-net	$ 141,250			$ 149,142
Contract revenues in excess of billings	73,916			69,574
Total current assets	288,917			313,690
PROPERTY AND EQUIPMENT-Net	347,740			346,540
Total assets	801,013			826,395
Total Great Lakes Dredge & Dock Corporation equity	274,817			273,635
Contract revenues	188,847	154,907		154,907
Costs of contract revenues	163,064	134,885		134,885
Gross Profit	25,783	20,022		20,022
Operating Income (Loss)	6,594	6,786		6,786
Income tax provision	(104)	564		564
Net income	411	953		953
Net Income (Loss) Attributable to Parent	433	1,068		1,068
Basic earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ 0.01	$ 0.02
Diluted earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ 0.01	$ 0.02
Net Cash Provided by (Used in) Operating Activities	(13,232)	(18,244)	(18,244)
Net Cash Provided by (Used in) Investing Activities	(15,456)	(8,033)	(8,033)
Parent Company [Member]
CURRENT ASSETS:
Total current assets	14,647			52,748
Total assets	670,809			677,161
Total Great Lakes Dredge & Dock Corporation equity	274,817			273,635
Operating Income (Loss)				(512)
Income tax provision	3,473			(79)
Net income	411			964
Net Income (Loss) Attributable to Parent	433			1,079
Net Cash Provided by (Used in) Operating Activities	$ (2,952)		$ (13,845)

XML

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, 2011	$ 6	$ 267,918	$ 24,042	$ 3	$ 568	$ 292,537
BALANCE - shares at Dec. 31, 2011	58,999
Share-based compensation, Value		1,015				1,015
Share-based compensation, Shares	94
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(2)				(2)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	9
Exercise of stock options, Value		40				40
Exercise of stock options, Shares	8
Excess income tax benefit from share based compensation		27				27
Dividends declared and paid			(1,240)			(1,240)
Dividend equivalents paid on restricted stock units			(12)			(12)
Net income			1,068		(115)	953
Other comprehensive loss-net of tax				478		478
BALANCE - value at Mar. 31, 2012	6	268,998	23,858	481	453	293,796
BALANCE - shares at Mar. 31, 2012	59,111
BALANCE - value at Dec. 31, 2012	6	271,418	2,591	(380)	(210)	273,425
BALANCE - shares at Dec. 31, 2012	59,359
Share-based compensation, Value		751				751
Share-based compensation, Shares	27
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(28)				(28)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	5
Excess income tax benefit from share based compensation		15				15
Net income			433		(22)	411
Other comprehensive loss-net of tax				11		11
BALANCE - value at Mar. 31, 2013	$ 6	$ 272,156	$ 3,024	$ (369)	$ (232)	$ 274,585
BALANCE - shares at Mar. 31, 2013	59,391

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Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
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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Nature Of Business And Summary Of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2013

Nature Of Business And Summary Of Significant Accounting Policies [Abstract]

Computations For Basic And Diluted Earnings Per Share

	Three Months Ended
	March 31,
	2013		2012
Net income attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	433	$	1,068
Weighted-average common shares outstanding — basic		59,369		59,038
Effect of stock options and restricted stock units		648		396
Weighted-average common shares outstanding — diluted		60,017		59,434
Earnings per share — basic	$	0.01	$	0.02
Earnings per share — diluted	$	0.01	$	0.02

XML

Document And Entity Information	3 Months Ended
	Mar. 31, 2013	May 03, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
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		59,390,161
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes

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Accounts Receivable And Contracts In Progress (Tables)

3 Months Ended

Mar. 31, 2013

Accounts Receivable And Contracts In Progress [Abstract]

Schedule Of Accounts Receivable

	March 31,		December 31,
	2013		2012
Completed contracts	$	56,984	$	43,898
Contracts in progress		74,653		91,459
Retainage		20,119		24,419
		151,756		159,776
Allowance for doubtful accounts		(2,469)		(2,050)
Total accounts receivable—net	$	149,287	$	157,726
Current portion of accounts receivable—net	$	141,250	$	149,142
Long-term accounts receivable and retainage		8,037		8,584
Total accounts receivable—net	$	149,287	$	157,726

Components Of Contracts In Progress

	March 31,		December 31,
	2013		2012
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	346,231	$	458,750
Amounts billed		(279,717)		(392,860)
Costs and earnings in excess of billings for contracts in progress		66,514		65,890
Costs and earnings in excess of billings for completed contracts		7,402		3,684
Total contract revenues in excess of billings	$	73,916	$	69,574
Billings in excess of costs and earnings:
Amounts billed	$	(376,801)	$	(338,741)
Costs and earnings for contracts in progress		367,272		327,461
Total billings in excess of contract revenues	$	(9,529)	$	(11,280)

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Consolidated Statements Of Operations [Abstract]
CONTRACT REVENUES	$ 188,847	$ 154,907	$ 154,907
COSTS OF CONTRACT REVENUES	163,064	134,885	134,885
GROSS PROFIT	25,783	20,022	20,022
OPERATING EXPENSES:
GENERAL AND ADMINISTRATIVE EXPENSES	19,187	13,267	13,267
GAIN ON SALE OF ASSETS-Net	2	(31)	(31)
Total operating income	6,594	6,786	6,786
OTHER EXPENSE:
Interest expense-net	(5,733)	(5,259)	(5,259)
Equity in earnings (loss) of joint ventures	(590)	(16)	(16)
Loss on foreign currency transactions-net	36	6	6
INCOME BEFORE INCOME TAXES	307	1,517	1,517
INCOME TAX PROVISION	104	(564)	(564)
NET INCOME	411	953	953
Net (income) loss attributable to noncontrolling interests	22	115	115
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS OF GREAT LAKES DREDGE & DOCK CORPORATION	$ 433	$ 1,068	$ 1,068
Basic earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ 0.01	$ 0.02
Basic weighted average shares	59,369	59,038
Diluted earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ 0.01	$ 0.02
Diluted weighted average shares	60,017	59,434

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Accounts Receivable And Contracts In Progress

3 Months Ended

Mar. 31, 2013

Accounts Receivable And Contracts In Progress [Abstract]

Accounts Receivables And Contracts In Progress

3.   Accounts receivable and contracts in progress

Accounts receivable at March 31, 2013 and December 31, 2012 are as follows:

	March 31,		December 31,
	2013		2012
Completed contracts	$	56,984	$	43,898
Contracts in progress		74,653		91,459
Retainage		20,119		24,419
		151,756		159,776
Allowance for doubtful accounts		(2,469)		(2,050)
Total accounts receivable—net	$	149,287	$	157,726
Current portion of accounts receivable—net	$	141,250	$	149,142
Long-term accounts receivable and retainage		8,037		8,584
Total accounts receivable—net	$	149,287	$	157,726

The components of contracts in progress at March 31, 2013 and December 31, 2012 are as follows:

	March 31,		December 31,
	2013		2012
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	346,231	$	458,750
Amounts billed		(279,717)		(392,860)
Costs and earnings in excess of billings for contracts in progress		66,514		65,890
Costs and earnings in excess of billings for completed contracts		7,402		3,684
Total contract revenues in excess of billings	$	73,916	$	69,574
Billings in excess of costs and earnings:
Amounts billed	$	(376,801)	$	(338,741)
Costs and earnings for contracts in progress		367,272		327,461
Total billings in excess of contract revenues	$	(9,529)	$	(11,280)

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Earnings Per Share

3 Months Ended

Mar. 31, 2013

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 three months ended March 31, 2013 and 2012,  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. The computations for basic and diluted earnings per share from continuing operations are as follows:

	Three Months Ended
	March 31,
	2013		2012
Net income attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	433	$	1,068
Weighted-average common shares outstanding — basic		59,369		59,038
Effect of stock options and restricted stock units		648		396
Weighted-average common shares outstanding — diluted		60,017		59,434
Earnings per share — basic	$	0.01	$	0.02
Earnings per share — diluted	$	0.01	$	0.02

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Nature Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Shares excluded from computation of diluted earnings per share			0	0	0
Net income	$ 411	$ 953				$ 953
Maximum [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Average equipment-related costs of total costs of contract revenue	23.00%
Minimum [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Average equipment-related costs of total costs of contract revenue	20.00%

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Measurements [Abstract]

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

				Fair Value Measurements at Reporting Date Using
Description	At March 31,  2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	150	$	-	$	150	$	-
				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	178	$	-	$	178	$	-

Schedule Fair Value Measurements Balance Sheet Location

		Fair Value at
		March 31,		December 31,
	Balance Sheet Location	2013		2012
Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	150	$	178

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Commitments And Contingencies

9 Months Ended

Sep. 30, 2012

Commitments And Contingencies [Abstract]

Commitments And Contingencies

8.   Commitments and contingencies

Commercial commitments

Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some 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 March 31, 2013, the Company had outstanding performance bonds valued at approximately $612,677; however, the revenue value remaining in backlog related to these projects totaled approximately $186,754. 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 the Company’s results of operations, cash flows or financial condition.

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.

On March 19, 2013, the Company and three of its current and former executives were sued in a securities class action in the Northern District of Illinois captioned United Union of Roofers, Waterproofers & Allied Workers Local Union No. 8 v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02115. The lawsuit, which was brought on behalf of all purchasers of the Company’s securities between August 7, 2012 and March 14, 2013, primarily alleges that the defendants made false and misleading statements regarding the recognition of revenue in the demolition segment and with regard to the Company’s internal control over financial reporting. This suit was filed following the Company’s announcement on March 14, 2013 that it would restate its second and third quarter 2012 financial statements. Two additional, similar lawsuits captioned Boozer v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02339, and Connors v. Great Lakes Dredge & Dock Corporation et al., Case No. 1:13-cv-02450, were filed in the Northern District of Illinois on March 28, 2013, and April 2, 2013, respectively. The Company denies liability and intends to vigorously defend these actions.

On March 28, 2013, the Company was named as a nominal defendant, and its directors were named as defendants, in a shareholder derivative action in DuPage County Circuit Court in Illinois captioned Hammoud v. Berger et al., Case No. 2013CH001110.  The lawsuit primarily alleges breaches of fiduciary duties related to allegedly false and misleading statements regarding the recognition of revenue in the demolition segment and with regard to the Company’s internal control over financial reporting, which exposed the Company to securities litigation.  A second, similar lawsuit captioned The City of Haverhill Retirement System v. Leight et al., Case No. 1:13-cv-02470, was filed in the Northern District of Illinois on April 2, 2013.

The Company has not accrued any amounts with respect to the above matters as the Company does not believe, based on information currently known to it, that a loss relating to these matters is probable, and an estimate of a range of potential losses relating to these matters cannot reasonably be made.

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.Oral argument was conducted on April 5, 2013 and on April 30, 2013 the appellate panel summarily affirmed the trial court’s opinion in favor of Great Lakes.  The defendants are entitled to appeal the decision to either the Second Circuit en banc or the Supreme Court of the United States. The Company cannot be assured whether defendants will continue to appeal the judgment or predict the outcome of any further appellate process.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2013

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 March 31, 2013 and December 31, 2012, the Company held certain derivative contracts that it uses to manage commodity price risk. The Company does not hold or issue derivatives for speculative or trading purposes. The fair values of these financial instruments are summarized as follows:

				Fair Value Measurements at Reporting Date Using
Description	At March 31,  2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	150	$	-	$	150	$	-
				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fuel hedge contracts	$	178	$	-	$	178	$	-

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 March 31, 2013, 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 2014. As of March 31, 2013, there were 2.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted fuel purchases throughMarch 2014. Under these swap agreements, the Company will pay fixed prices ranging from $3.01 to $3.26 per gallon.

At March 31, 2013, the fair value liability of the fuel hedge contracts was estimated to be $150 and is recorded in accrued expenses. At December 31, 2012 the fair value asset of the fuel hedge contracts was estimated to be $178 and is recorded in accrued expenses. The loss reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the three months ended March 31, 2013 was $137. The remaining gains and losses included in accumulated other comprehensive income (loss) at March 31, 2013 will be reclassified into earnings over the next  twelve 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 fuel hedge contracts outstanding as of March 31, 2013 and December 31, 2012 is as follows:

		Fair Value at
		March 31,		December 31,
	Balance Sheet Location	2013		2012
Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	150	$	178

Accumulated other comprehensive income

Changes in thecomponents of the accumulated balances of other comprehensive income are as follows:

	Three months ended, March 31,
	2013		2012
Cumulative translation adjustments—net of tax	$	(6)	$	4
Derivatives:
Reclassification of derivative losses (gains) to earnings—net of tax		137		(406)
Change in fair value of derivatives—net of tax		(120)		880
Net unrealized gain on derivatives—net of tax		17		474
Total other comprehensive income	$	11	$	478

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

		Three months ended March 31,
	Statement of Operations Location	2013		2012
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	228	$	(675)
	Income tax (provision) benefit		(91)		269
		$	137	$	(406)

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 March 31, 2013. 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 atMarch 31, 2013, 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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Segment Information

3 Months Ended

Mar. 31, 2013

Segment Information [Abstract]

Segment Information

7.   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
	March 31,
	2013		2012
Dredging
Contract revenues	$	173,959	$	123,673
Operating income		19,000		4,899
Demolition
Contract revenues	$	14,888	$	32,546
Operating income (loss)		(12,406)		1,887
Intersegment revenues	$	-	$	(1,312)
Total
Contract revenues	$	188,847	$	154,907
Operating income		6,594		6,786

Foreign dredging revenue of $38,385 and $18,025 for the three months ended March 31, 2013 and 2012, respectively, was primarily attributable to work done in the Middle East as well as 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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Subsidiary Guarantors

3 Months Ended

Mar. 31, 2013

Subsidiary Guarantors [Abstract]

Subsidiary Guarantors

9.Subsidiary guarantors

The Company’s long-term debt at March 31, 2013 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 March 31, 2013 and December 31, 2012;  

(ii) statements of operations and comprehensive income for the three months ended March 31, 2013 and 2012; and

(iii) statements of cash flows for the three months ended March 31, 2013 and 2012.  

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF MARCH 31, 2013
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	6,336	$	307	$	-	$	-	$	6,643
Accounts receivable — net		137,857		3,393		-		-		141,250
Receivables from affiliates		87,422		5,982		3,514		(96,918)		-
Contract revenues in excess of billings		73,450		534		-		(68)		73,916
Inventories		26,629		-		-		-		26,629
Prepaid expenses and other current assets		29,326		20		11,133		-		40,479
Total current assets		361,020		10,236		14,647		(96,986)		288,917
PROPERTY AND EQUIPMENT—Net		347,706		34		-		-		347,740
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		103,633		334		-		-		103,967
INVENTORIES — Noncurrent		36,423		-		-		-		36,423
INVESTMENTS IN JOINT VENTURES		6,457		-		-		-		6,457
INVESTMENTS IN SUBSIDIARIES		2,081		-		650,100		(652,181)		-
OTHER		11,444		3		6,062		-		17,509
TOTAL	$	868,764	$	10,607	$	670,809	$	(749,167)	$	801,013
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	86,909	$	1,310	$	405	$	-	$	88,624
Payables to affiliates		75,529		4,720		16,525		(96,774)		-
Accrued expenses		35,980		726		3,855		-		40,561
Billings in excess of contract revenues		9,474		267		-		(212)		9,529
Current portion of long term debt		2,526		-		-		-		2,526
Total current liabilities		210,418		7,023		20,785		(96,986)		141,240
7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
REVOLVING CREDIT FACILITY		-		-		21,500		-		21,500
DEFERRED INCOME TAXES		45		-		103,391		-		103,436
OTHER		9,704		-		548		-		10,252
Total liabilities		220,167		7,023		396,224		(96,986)		526,428
Total Great Lakes Dredge & Dock Corporation Equity		648,597		3,584		274,817		(652,181)		274,817
NONCONTROLLING INTERESTS		-		-		(232)		-		(232)
TOTAL EQUITY		648,597		3,584		274,585		(652,181)		274,585
TOTAL	$	868,764	$	10,607	$	670,809	$	(749,167)	$	801,013

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2012
(In thousands)
ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	24,272	$	168	$	-	$	-	$	24,440
Accounts receivable — net		147,610		1,532		-		-		149,142
Receivables from affiliates		102,968		7,680		38,115		(148,763)		-
Contract revenues in excess of billings		69,649		5		-		(80)		69,574
Inventories		28,726		-		-		-		28,726
Prepaid expenses and other current assets		27,147		28		14,633		-		41,808
Total current assets		400,372		9,413		52,748		(148,843)		313,690
PROPERTY AND EQUIPMENT—Net		346,503		37		-		-		346,540
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		103,687		344		-		-		104,031
INVENTORIES — Noncurrent		37,392		-		-		-		37,392
INVESTMENTS IN JOINT VENTURES		7,047		-		-		-		7,047
INVESTMENTS IN SUBSIDIARIES		2,127		-		618,070		(620,197)		-
OTHER		11,350		2		6,343		-		17,695
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	122,191	$	891	$	-	$	-	$	123,082
Payables to affiliates		105,303		4,843		38,647		(148,793)		-
Accrued expenses		29,417		677		8,396		-		38,490
Billings in excess of contract revenues		11,207		123		-		(50)		11,280
Current portion of long term debt		13,098		-		-		-		13,098
Total current liabilities		281,216		6,534		47,043		(148,843)		185,950
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		623		-		106,144		-		106,767
OTHER		9,704		-		549		-		10,253
Total liabilities		291,543		6,534		403,736		(148,843)		552,970
Total Great Lakes Dredge & Dock Corporation Equity		616,935		3,262		273,635		(620,197)		273,635
NONCONTROLLING INTERESTS		-		-		(210)		-		(210)
TOTAL EQUITY		616,935		3,262		273,425		(620,197)		273,425
TOTAL	$	908,478	$	9,796	$	677,161	$	(769,040)	$	826,395

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED MARCH 31, 2013
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	185,419	$	3,759	$	-	$	(331)	$	188,847
Costs of contract revenues		(159,932)		(3,463)		-		331		(163,064)
Gross profit		25,487		296		-		-		25,783
OPERATING EXPENSES:
General and administrative expenses		18,996		191		-		-		19,187
(Gain) loss on sale of assets—net		2		-		-		-		2
Operating income (loss)		6,489		105		-		-		6,594
Interest expense—net		(19)		(42)		(5,672)		-		(5,733)
Equity in earnings (loss) of subsidiaries		(47)		-		9,556		(9,509)		-
Equity in earnings of joint ventures		(590)		-		-		-		(590)
Gain on foreign currency transactions—net		36		-		-		-		36
Income (loss) before income taxes		5,869		63		3,884		(9,509)		307
Income tax (provision) benefit		3,577		-		(3,473)		-		104
Net income (loss)		9,446		63		411		(9,509)		411
Net loss attributable to noncontrolling interests		-		-		22		-		22
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	9,446	$	63	$	433	$	(9,509)	$	433
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	9,463	$	57	$	444	$	(9,520)	$	444

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED MARCH 31, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
Contract revenues	$	155,444	$	1,799	$	-	$	(2,336)	$	154,907
Costs of contract revenues		(135,167)		(2,054)		-		2,336		(134,885)
Gross profit		20,277		(255)		-		-		20,022
OPERATING EXPENSES:
General and administrative expenses		12,569		186		512		-		13,267
(Gain) loss on sale of assets—net		(42)		-		11		-		(31)
Operating income (loss)		7,750		(441)		(512)		-		6,786
Interest expense—net		(281)		(28)		(4,950)		-		(5,259)
Equity in earnings (loss) of subsidiaries		(379)		-		6,347		(5,968)		-
Equity in earnings of joint ventures		(16)		-		-		-		(16)
Loss on foreign currency transactions, net		6		-		-		-		6
Income (loss) before income taxes		7,080		(469)		885		(5,968)		1,517
Income tax (provision) benefit		(643)		-		79		-		(564)
Net income (loss)		6,437		(469)		964		(5,968)		953
Net income attributable to noncontrolling interests		-		-		115		-		115
Net income (loss) attributable to Great Lakes  Dredge & Dock Corporation	$	6,437	$	(469)	$	1,079	$	(5,968)	$	1,068
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	6,911	$	(465)	$	1,546	$	(6,446)	$	1,546

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2013
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(10,786)	$	506	$	(2,952)	$	-	$	(13,232)
INVESTING ACTIVITIES:
Purchases of property and equipment		(15,514)		-		-		-		(15,514)
Proceeds from dispositions of property and equipment		58		-		-		-		58
Net cash flows used in investing activities		(15,456)		-		-		-		(15,456)
FINANCING ACTIVITIES:
Repayments of long term note payable		-		-		(10,547)		-		(10,547)
Taxes paid on settlement of vested share awards		-		-		(28)		-		(28)
Net change in accounts with affiliates		8,331		(343)		(7,988)		-		-
Repayments of equipment debt		(25)		-		-		-		(25)
Excess income tax benefit from share-based compensation		-		-		15		-		15
Borrowings under revolving loans		-		-		79,500		-		79,500
Repayments of revolving loans		-		-		(58,000)		-		(58,000)
Net cash flows provided by (used in) financing activities		8,306		(343)		2,952		-		10,915
Effect of foreign currency exchange rates on cash and cash equivalents		-		(24)		-		-		(24)
Net decrease in cash and cash equivalents		(17,936)		139		-		-		(17,797)
Cash and cash equivalents at beginning of period		24,272		168		-		-		24,440
Cash and cash equivalents at end of period	$	6,336	$	307	$	-	$	-	$	6,643

GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE THREE MONTHS ENDED MARCH 31, 2012
(In thousands)
	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	(5,200)	$	801	$	(13,845)	$	-	$	(18,244)
INVESTING ACTIVITIES:
Purchases of property and equipment		(8,101)		-		-		-		(8,101)
Proceeds from dispositions of property and equipment		68		-		-		-		68
Net cash flows used in investing activities		(8,033)		-		-		-		(8,033)
FINANCING ACTIVITIES:
Dividends paid		-		-		(1,240)		-		(1,240)
Dividend equivalents paid on restricted stock units		-		-		(12)		-		(12)
Taxes paid on vested share awards		-		-		(2)				(2)
Net change in accounts with affiliates		(10,089)		(4,978)		15,067		-		-
Capital contributions		-		35		(35)		-		-
Repayments of equipment debt		(238)		-		-		-		(238)
Exercise of stock options		-		-		40		-		40
Excess income tax benefit from share-based compensation		-		-		27		-		27
Net cash flows provided by financing activities		(10,327)		(4,943)		13,845		-		(1,425)
Effect of foreign currency exchange rates on cash and cash equivalents		-		32		-		-		32
Net increase in cash and cash equivalents		(23,560)		(4,110)		-		-		(27,670)
Cash and cash equivalents at beginning of period		108,985		4,303		-		-		113,288
Cash and cash equivalents at end of period	$	85,425	$	193	$	-	$	-	$	85,618

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Long-term Debt (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Jun. 04, 2012	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jan. 31, 2011
Debt Instrument [Line Items]
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 at either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50% per annum.
Line of Credit Facility, Amount Outstanding		$ 21,500
Letters of credit outstanding		33,420
Letter of credit remaining borrowing capacity		120,080
Senior Notes		250,000		250,000	250,000
Senior notes percentage		7.375%
Amortization of deferred financing fees		288	334
Internaional Line Of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		24,000
Parent Company [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding		21,500
Senior Notes		250,000		250,000
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	125,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	175,000
Line of credit facility optional increase capacity	50,000
Line of Credit Facility, Amount Outstanding		21,500
Multicurrency [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	50,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	10,000
Maximum [Member] | LIBOR Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate	2.50%
Maximum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, basis spread on variable rate	1.50%

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Information [Abstract]

Segment Reporting By Segment

	Three Months Ended
	March 31,
	2013		2012
Dredging
Contract revenues	$	173,959	$	123,673
Operating income		19,000		4,899
Demolition
Contract revenues	$	14,888	$	32,546
Operating income (loss)		(12,406)		1,887
Intersegment revenues	$	-	$	(1,312)
Total
Contract revenues	$	188,847	$	154,907
Operating income		6,594		6,786

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Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts Receivable [Line Items]
Retainage	$ 20,119	$ 24,419
Accounts Receivable, Gross	151,756	159,776
Allowance for doubtful accounts	(2,469)	(2,050)
Total accounts receivable-net	149,287	157,726
Current portion of accounts receivable-net	141,250	149,142
Long-term accounts receivable and retainage	8,037	8,584
Completed Contracts [Member]
Accounts Receivable [Line Items]
Contracts	56,984	43,898
Contracts In Progress [Member]
Accounts Receivable [Line Items]
Contracts	$ 74,653	$ 91,459

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 411		$ 953
Currency translation adjustment-net of tax	(6)	[1]	4	[1]
Reclassification of derivative gains (losses) to earnings-net of tax	(137)
Net unrealized gain on derivatives-net of tax	17	[2]	474	[2]
Other comprehensive loss-net of tax	11		478
Comprehensive income	422		1,431
Comprehensive (income) loss attributable to noncontrolling interests	22		115
Comprehensive income attributable to Great Lakes Dredge & Dock Corporation	$ 444		$ 1,546

[1] Net of income tax (expense) benefit of $(4) and $3 for the three months ended March 31, 2013 and 2012, respectively.

[2] Net of income tax benefit of $11 and $315 for the three months ended March 31, 2013 and 2012, respectively.

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Nature Of Business And Summary Of Signicant Accounting Policies

3 Months Ended

Mar. 31, 2013

Nature Of Business And Summary Of Significant Accounting Policies [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 its 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, 2012. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of March 31, 2013, and its results of operations for the three months ended March 31, 2013 and 2012 and cash flows for the three months ended March 31, 2013 and 2012 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 coastal protection 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 20% to 23%  of total costs of contract revenues over the prior three years. During the year, both equipment utilization and the timing of fixed cost expenditures fluctuate significantly. Accordingly, the Company allocates these fixed equipment costs to interim periods in proportion to revenues recognized over the year, to better match revenues and expenses. Specifically, at each interim reporting date the Company compares actual revenues earned to date on its dredging contracts to expected annual revenues and recognizes equipment costs on the same proportionate basis. In the fourth quarter, any over or under allocated equipment costs are recognized such that the expense for the year equals actual equipment costs incurred during the year.

The Company operates in four operating segments that, through aggregation, comprise two reportable segments: dredging and demolition. Four operating segments were aggregated into two reportable segments as the segments have similarity in economic margins, services, production processes, customer types, distribution methods and regulatory environment. The Company has determined that the operating segments are the Company’s four reporting units.

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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Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings in excess of billings on contracts in progress	$ 66,514	$ 65,890
Costs and earnings in excess of billings for completed contracts	7,402	3,684
Total contract revenues in excess of billings	73,916	69,574
Current portion of contract revenues in excess of billings	73,916	69,574
Total billings in excess of contract revenues	(9,529)	(11,280)
Costs And Earnings In Excess Of Billings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings for contracts in progress	346,231	458,750
Amounts billed	(279,717)	(392,860)
Billings In Excess Of Costs And Earnings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Costs and earnings for contracts in progress	367,272	327,461
Amounts billed	$ (376,801)	$ (338,741)

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Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jan. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 6,643	$ 24,440	$ 85,618	$ 24,440	$ 85,618		$ 113,288
Accounts receivable-net	141,250	149,142
Contract revenues in excess of billings	73,916	69,574
Inventories	26,629	28,726
Prepaid Expense and Other Assets, Current	40,479	41,808
Total current assets	288,917	313,690
PROPERTY AND EQUIPMENT-Net	347,740	346,540
GOODWILL AND OTHER INTANGIBLE	103,967	104,031
INVENTORIES-Noncurrent	36,423	37,392
INVESTMENTS IN JOINT VENTURES	6,457	7,047
OTHER	17,509	17,695
TOTAL	801,013	826,395
LIABILITIES AND EQUITY
Accounts payable	88,624	123,082
Accrued expenses	40,561	38,490
Billings in excess of contract revenues	9,529	11,280
Current portion of long term debt	2,526	13,098
Total current liabilities	141,240	185,950
7 3/8% SENIOR NOTES	250,000	250,000				250,000
Line of Credit Facility, Amount Outstanding	21,500
DEFERRED INCOME TAXES	103,436	106,767
OTHER	10,252	10,253
Total liabilities	526,428	552,970
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	274,817	273,635
NONCONTROLLING INTERESTS	(232)	(210)
Total equity	274,585	273,425	293,796	292,537
TOTAL	801,013	826,395
Parent Company [Member]
ASSETS
Receivables from affiliates	3,514	38,115
Prepaid Expense and Other Assets, Current	11,133	14,633
Total current assets	14,647	52,748
INVESTMENTS IN SUBSIDIARIES	650,100	618,070
OTHER	6,062	6,343
TOTAL	670,809	677,161
LIABILITIES AND EQUITY
Accounts payable	405
Payables to affiliates	16,525	38,647
Accrued expenses	3,855	8,396
Total current liabilities	20,785	47,043
7 3/8% SENIOR NOTES	250,000	250,000
Line of Credit Facility, Amount Outstanding	21,500
DEFERRED INCOME TAXES	103,391	106,144
OTHER	548	549
Total liabilities	396,224	403,736
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	274,817	273,635
NONCONTROLLING INTERESTS	(232)	(210)
Total equity	274,585	273,425
TOTAL	670,809	677,161
Subsidiary Guarantors [Member]
ASSETS
Cash and cash equivalents	6,336	24,272		24,272	85,425		108,985
Accounts receivable-net	137,857	147,610
Receivables from affiliates	87,422	102,968
Contract revenues in excess of billings	73,450	69,649
Inventories	26,629	28,726
Prepaid Expense and Other Assets, Current	29,326	27,147
Total current assets	361,020	400,372
PROPERTY AND EQUIPMENT-Net	347,706	346,503
GOODWILL AND OTHER INTANGIBLE	103,633	103,687
INVENTORIES-Noncurrent	36,423	37,392
INVESTMENTS IN JOINT VENTURES	6,457	7,047
INVESTMENTS IN SUBSIDIARIES	2,081	2,127
OTHER	11,444	11,350
TOTAL	868,764	908,478
LIABILITIES AND EQUITY
Accounts payable	86,909	122,191
Payables to affiliates	75,529	105,303
Accrued expenses	35,980	29,417
Billings in excess of contract revenues	9,474	11,207
Current portion of long term debt	2,526	13,098
Total current liabilities	210,418	281,216
DEFERRED INCOME TAXES	45	623
OTHER	9,704	9,704
Total liabilities	220,167	291,543
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	648,597	616,935
Total equity	648,597	616,935
TOTAL	868,764	908,478
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	307	168		168	193		4,303
Accounts receivable-net	3,393	1,532
Receivables from affiliates	5,982	7,680
Contract revenues in excess of billings	534	5
Prepaid Expense and Other Assets, Current	20	28
Total current assets	10,236	9,413
PROPERTY AND EQUIPMENT-Net	34	37
GOODWILL AND OTHER INTANGIBLE	334	344
OTHER	3	2
TOTAL	10,607	9,796
LIABILITIES AND EQUITY
Accounts payable	1,310	891
Payables to affiliates	4,720	4,843
Accrued expenses	726	677
Billings in excess of contract revenues	267	123
Total current liabilities	7,023	6,534
Total liabilities	7,023	6,534
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	3,584	3,262
Total equity	3,584	3,262
TOTAL	10,607	9,796
Eliminations [Member]
ASSETS
Receivables from affiliates	(96,918)	(148,763)
Contract revenues in excess of billings	(68)	(80)
Total current assets	(96,986)	(148,843)
INVESTMENTS IN SUBSIDIARIES	(652,181)	(620,197)
TOTAL	(749,167)	(769,040)
LIABILITIES AND EQUITY
Payables to affiliates	(96,774)	(148,793)
Billings in excess of contract revenues	(212)	(50)
Total current liabilities	(96,986)	(148,843)
Total liabilities	(96,986)	(148,843)
EQUITY:
Total Great Lakes Dredge & Dock Corporation equity	(652,181)	(620,197)
Total equity	(652,181)	(620,197)
TOTAL	$ (749,167)	$ (769,040)

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Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2013

Accrued Expenses [Abstract]

Accrued Expenses

	March 31,		December 31,
	2013		2012
Insurance	$	10,139	$	9,070
Payroll and employee benefits		9,560		9,906
Construction liabilities		9,423		6,426
Interest		3,401		7,837
Income and other taxes		1,903		1,699
Plant & overhead accrual		1,898		-
Percentage of completion adjustment		1,719		1,552
Other		2,518		2,000
Total accrued expenses	$	40,561	$	38,490