View Filing Data

Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Jun. 30, 2012	Aug. 03, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Trading Symbol	GLDD
Entity Registrant Name	Great Lakes Dredge & Dock CORP
Entity Central Index Key	0001372020
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		59,220,422

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 70,791	$ 113,288
Accounts receivable - net	112,897	120,268
Contract revenues in excess of billings	50,889	26,412
Inventories	48,696	33,426
Prepaid expenses and other current assets	42,932	32,384
Total current assets	326,205	325,778
Property and equipment - net	316,460	310,520
Goodwill and other intangiable assets - net	98,729	98,863
Inventories- noncurrent	23,206	30,103
Investments in joint ventures	6,899	6,923
Other	18,461	16,273
Total	789,960	788,460
LIABILITIES AND EQUITY
Accounts payable	80,652	82,745
Accrued expenses	27,477	31,121
Billings in excess of contract revenues	19,999	13,627
Current portion of long term debt	2,658	3,033
Total current liabilities	130,786	130,526
Long term note payable	2,500	2,500
7 3/8% Senior notes	250,000	250,000
Deferred income taxes	102,920	104,352
OTHER	8,153	8,545
Total liabilities	494,359	495,923
EQUITY:
Common stock-$.0001 par value; 90,000,000 authorized, 59,110,847 and 58,999,404 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively.	6	6
Additional paid-in capital	269,613	267,918
Retained earnings	27,043	24,042
Accumulated other comprehensive income	(1,289)	3
Total Great Lakes Dredge & Dock Corporation Equity	295,373	291,969
Noncontrolling interests	228	568
Total equity	295,601	292,537
TOTAL	$ 789,960	$ 788,460

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	59,220,422	58,999,404
Common stock, shares outstanding	59,220,422	58,999,404

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements Of Operations [Abstract]
Contract revenues	$ 166,532	$ 154,959	$ 321,439	$ 310,297
Costs of contract revenues	142,643	135,193	277,528	263,089
Gross profit	23,889	19,766	43,911	47,208
General and administrative expenses	11,456	13,622	24,723	25,711
Gain on sale of assets-net	(93)	(2,513)	(124)	(2,771)
Operating income	12,526	8,657	19,312	24,268
Interest expense-net	(5,383)	(4,911)	(10,642)	(10,861)
Equity in loss of joint ventures	(8)	(123)	(24)	(714)
Loss on foreign currency transactions-net	(21)		(15)
Loss on extinguishment of debt				(5,145)
Income before income taxes	7,114	3,623	8,631	7,548
Income tax (provision) benefits	(2,768)	(1,455)	(3,332)	(2,982)
Net income	4,346	2,168	5,299	4,566
Net loss attributable to noncontrolling interests	91	(462)	206	(468)
Net income attributable to Great Lakes Dredge & Dock Corporation	$ 4,437	$ 1,706	$ 5,505	$ 4,098
Basic earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ 0.07	$ 0.03	$ 0.09	$ 0.07
Basic weighted average shares	59,171	58,875	59,105	58,830
Diluted earnings per share attributable to Great Lakes Dredge & Dock Corporation	$ 0.07	$ 0.03	$ 0.09	$ 0.07
Diluted weighted average shares	59,534	59,184	59,493	59,228
Dividends declared per share	$ 0.02	$ 0.02	$ 0.04	$ 0.04

Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2012

Jun. 30, 2011

Jun. 30, 2012

Jun. 30, 2011

Condensed Consolidated Statements Of Comprehensive Income [Abstract]

Net income

$ 4,346

$ 2,168

$ 5,299

$ 4,566

Currency translation adjustment-net of tax

^[1]

(8)

(4)

Reclassification of derivative gains to earnings-net of tax

^[2]

143

(444)

(263)

(1,067)

Change in fair value of derivatives-net of tax

^[3]

(1,905)

(370)

(1,025)

819

Other comprehensive income (loss)-net of tax, Total

(1,770)

(814)

(1,292)

(248)

Comprehensive income

2,576

1,354

4,007

4,318

Comprehensive (income) loss attributable to noncontrolling interests

(462)

206

(468)

Comprehensive income attributable to Great Lakes Dredge & Dock Corporation

$ 2,667

$ 892

$ 4,213

$ 3,850

[1]	Net of income tax (expense) benefit of $(5) and $0 for the three months ended June 30, 2012 and 2011, respectively, and $(3) and $0 for the six months ended June 30, 2012 and 2011, respectively.
[2]	Net of income tax (expense) benefit of $94 and $(295) for the three months ended June 30, 2012 and 2011, respectively, and $(175) and $(709) for the six months ended June 30, 2012 and 2011, respectively.
[3]	Net of income tax (expense) benefit of $(1,265) and $(246) for the three months ended June 30, 2012 and 2011, respectively, and $(681) and $544 for the six months ended June 30, 2012 and 2011, respectively.

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

Amount after tax, before reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a-c)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32157-110900

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 13, 20, 31
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Net of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 18, 19
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 31, 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 121
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591552-111686

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=18733213&loc=SL4591551-111686

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A1, A4, A5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ (5)	$ 0	$ (3)	$ 0
Reclassification of derivative gains to earnings, tax	94	(295)	(179)	(709)
Change in fair value of derivatives, tax	$ (1,265)	$ (295)	$ (681)	$ 544

- Definition

Amount of tax effect, net of reclassification adjustments, on the result from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 25
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 31
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 23, 24, 25, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

+ References + Details

Condensed Consolidated Statements Of Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss)[Member]	Noncontrolling Interests [Member]	Total
Balance - value at Dec. 31, 2010	$ 6	$ 266,329	$ 12,261	$ 357	$ (2,128)	$ 276,825
Balance - shares at Dec. 31, 2010	58,770,369
Share-based compensation, Value		843				843
Share-based compensation, Shares	57,215
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(250)				(250)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	81,387
Exercise of stock options, Value		27				27
Exercise of stock options, Shares	6,278
Dividends declared and paid			(2,236)			(2,236)
Dividend equivalents paid on restricted stock units			(11)			(11)
Excess income tax benefit from share based compensation		52				52
Acquisition of noncontrolling interest in NASDI, LLC		(40)			1,973	1,933
Net income			4,098		468	4,566
Other comprehensive income-net of tax				(248)		(248)
Balance - value at Jun. 30, 2011	$ 6	266,961	14,112	109	313	281,501
Balance - shares at Jun. 30, 2011	58,915,249
Balance - value at Dec. 31, 2011	$ 6	267,918	24,042	3	568	292,537
Balance - shares at Dec. 31, 2011	58,999,404
Share-based compensation, Value		1,714				1,714
Share-based compensation, Shares	122,136
Vesting of restricted stock units, including impact of shares withheld for taxes, value		(212)				(212)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares	81,640
Exercise of stock options, Value		75				75
Exercise of stock options, Shares	17,242
Dividends declared and paid			(2,482)			(2,482)
Dividend equivalents paid on restricted stock units			(22)			(22)
Excess income tax benefit from share based compensation		118				118
Net income			5,505		(206)	5,299
Other comprehensive income-net of tax				(1,292)		(1,292)
Balance - value at Jun. 30, 2012	$ 6	$ 269,613	$ 27,043	$ (1,289)	228	295,601
Balance - shares at Jun. 30, 2012	59,220,422
Distributions paid to noncontrolling interests					$ (134)	$ (134)

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 5,299	$ 4,566
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	16,123	18,804
Equity in loss of joint ventures	24	714
Loss on extinguishment of 7 3/4% senior subordinated notes		5,145
Deferred income taxes	(478)	1,010
Gain on dispositions of property and equipment	(124)	(2,771)
Gain on adjustment of contingent earnout	(240)
Amortization of deferred financing fees	669	775
Unrealized foreign currency gain	378
Share-based compensation expense	1,714	843
Excess income tax benefit from share based compensation	(118)	(52)
Changes in assets and liabilities:
Accounts receivable	4,301	(13,025)
Contract revenues in excess of billings	(22,288)	(2,278)
Inventories	(8,653)	(362)
Prepaid expenses and other current assets	(5,873)	(12,432)
Accounts payable and accrued expenses	(11,771)	(5,523)
Billings in excess of contract revenues	6,371	(2,165)
Other noncurrent assets and liabilities	(519)	(3,694)
Net cash flows used in operating activities	(15,185)	(10,445)
INVESTING ACTIVITIES:
Purchases of property and equipment	(22,428)	(13,583)
Proceeds from dispositions of property and equipment	226	7,275
Net cash flows used in investing activities	(22,202)	(6,308)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		250,000
Redemption of 7 3/4% senior subordinated notes		(175,000)
Senior subordinated notes redemption premium		(2,264)
Deferred financing fees	(2,039)	(5,829)
Distribution made to member or limited partner, cash distributions paid	(133)
Dividends paid	(2,482)	(2,236)
Dividend equivalents paid on restricted stock units	(22)	(11)
Taxes paid on settlement of vested share awards	(212)	(250)
Repayments of equipment debt	(426)	(217)
Exercise of stock options	75	27
Excess income tax benefit from share-based compensation	118	52
Net cash flows provided by (used in) financing activities	(5,121)	64,272
Effect of foreign currency exchange rates on cash and cash equivalents	11
Net increase (decrease) in cash and cash equivalents	(42,497)	47,519
Cash and cash equivalents at beginning of period	113,288	48,478
Cash and cash equivalents at end of period	70,791	95,997
Supplemental Cash Flow Information
Cash paid for interest	9,602	2,728
Cash paid (refunded) for income taxes	(6,371)	5,155
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$ 6,231	4,303
Acquisition of noncontrolling interest in NASDI, LLC		$ 40

Basis Of Presentation	6 Months Ended
Basis Of Presentation	Jun. 30, 2012
Basis Of Presentation [Abstract]
Basis Of Presentation	1. Basis of presentation The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Great Lakes Dredge & Dock Corporation and Subsidiaries (the “Company” or “Great Lakes”) and the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2011. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of June 30, 2012, and its results of operations for the three and six months ended June 30, 2012 and 2011 and cash flows for the six months ended June 30, 2012 and 2011 have been included. The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel and project overhead. Hourly labor is generally hired on a project-by-project basis. Costs of contract revenues vary significantly depending on the type and location of work performed and assets utilized. Generally, capital projects have the highest margins due to the complexity of the projects, while beach nourishment projects have the most volatile margins because they are most often exposed to variability in weather conditions. The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. These costs have averaged approximately 21% to 25% of total costs of contract revenues over the prior three years. During the year, both equipment utilization and the timing of fixed cost expenditures fluctuate significantly. Accordingly, the Company allocates these fixed equipment costs to interim periods in proportion to revenues recognized over the year, to better match revenues and expenses. Specifically, at each interim reporting date the Company compares actual revenues earned to date on its dredging contracts to expected annual revenues and recognizes equipment costs on the same proportionate basis. In the fourth quarter, any over or under allocated equipment costs are recognized such that the expense for the year equals actual equipment costs incurred during the year. The Company operates in two reportable segments: dredging and demolition. These reportable segments are the Company’s operating segments and the reporting units at which the Company tests goodwill for impairment. The Company performed its most recent annual test of impairment as of July 1, 2011 for the goodwill in both the dredging and demolition segments with no indication of goodwill impairment as of the test date. As of the test date, the fair value of both the dredging segment and the demolition segment were in excess of their carrying values by approximately 35% and 8%, respectively. Given the small margin with which the demolition segment’s fair value is in excess of its carrying value, a more than insignificant decline in the demolition segment’s future operating results or cash flow forecasts versus the segment’s current forecasts could potentially cause a goodwill impairment charge to be recognized in a future period. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2012. 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.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

+ References + Details

Earnings Per Share

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Earnings Per Share

2. Earnings per share

Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings per share is computed similar to basic earnings per share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. For the three and six months ended June 30, 2012 and 2011, zero options to purchase shares of common stock were excluded from the calculation of diluted earnings per share based on the application of the treasury stock method. The computations for basic and diluted earnings per share from continuing operations are as follows:

Accounts Receivable And Contracts In Progress

6 Months Ended

Jun. 30, 2012

Accounts Receivable And Contracts In Progress [Abstract]

Accounts Receivables And Contracts In Progress

3. Accounts receivable and contracts in progress

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


	June 30,		December 31,
	2012		2011
Completed contracts	$	30,713	$	38,317
Contracts in progress		71,506		69,469
Retainage		21,220		20,692
		123,439		128,478
Allowance for doubtful accounts		(1,500)		(1,839)

Total accounts receivable—net	$	121,939	$	126,639

Current portion of accounts receivable—net	$	112,897	$	120,268
Long-term accounts receivable and retainage		9,042		6,371
Total accounts receivable—net	$	121,939	$	126,639

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


	June 30,		December 31,
	2012		2011
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	366,985	$	173,187
Amounts billed		(317,477)		(152,045)
Costs and earnings in excess of billings for contracts in progress		49,508		21,142

Costs and earnings in excess of billings for completed contracts		1,381		7,459

Total contract revenues in excess of billings	$	50,889	$	28,601

Current portion of contract revenues in excess of billings	$	50,889	$	26,412
Portion included in other noncurrent assets		-		2,189
Total contract revenues in excess of billings	$	50,889	$	28,601

Billings in excess of costs and earnings:
Amounts billed	$	(383,047)	$	(427,797)
Costs and earnings for contracts in progress		363,048		414,170

Total billings in excess of contract revenues	$	(19,999)	$	(13,627)

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5162-111524

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3, 4
-Article 5

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 9

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

+ Details

Fair Value Measurements

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

4. Fair value measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A fair value hierarchy has been established by GAAP that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The accounting guidance describes three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. At June 30, 2012 and December 31, 2011, the Company held certain derivative contracts that it uses to manage foreign currency risk, commodity price risk and interest rate risk. The Company does not hold or issue derivatives for speculative or trading purposes. The fair values of these financial instruments are summarized as follows:


				Fair Value Measurements at Reporting Date Using
Description	At June 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Assets
Interest rate swap contracts	$	416	$	-	$	416	$	-
Foreign exchange contracts		137		-		137		-
Total assets measured at fair value	$	553	$	-	$	553	$	-

Liabilities
Fuel hedge contracts	$	1,695	$	-	$	1,695	$	-

				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	449	$	-	$	449	$	-
Interest rate swap contracts		755		-		755		-
Foreign exchange contracts		155		-		155		-
Total assets measured at fair value	$	1,359	$	-	$	1,359	$	-

Interest rate swap contracts

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

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


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2011
Interest rate swap contracts
Balance at January 1,	$	1,264
Total unrealized gains (losses) included in earnings		(568)
Settlements		445
Balance at June 30,	$	1,141


Balance at April 1,	$	1,299
Total unrealized gains (losses) included in earnings		(603)
Settlements		445
Balance at June 30,	$	1,141

Foreign exchange contracts

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

Fuel hedge contracts

The Company is exposed to certain market risks, primarily commodity price risk as it relates to the diesel fuel purchase requirements, which occur in the normal course of business. The Company enters into heating oil commodity swap contracts to hedge the risk that fluctuations in diesel fuel prices will have an adverse impact on cash flows associated with its domestic dredging contracts. The Company’s goal is to hedge approximately 80% of the fuel requirements for work in backlog.

As of June 30, 2012, the Company was party to various swap arrangements to hedge the price of a portion of its diesel fuel purchase requirements for work in its backlog to be performed through February 2013. As of June 30, 2012, there were 5.0 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted fuel purchases through February 2013. Under these swap agreements, the Company will pay fixed prices ranging from $2.65 to $3.29 per gallon.

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

At June 30, 2012, the fair value liability of the fuel hedge contracts was estimated to be $1,695 and is recorded in accrued expenses. At December 31, 2011 the fair value asset of the fuel hedge contracts was estimated to be $449 and is recorded in other current assets. The loss reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the six months ended June 30, 2012 was $263. The remaining gains and losses included in accumulated other comprehensive income (loss) at June 30, 2012 will be reclassified into earnings over the next eight months, corresponding to the period during which the hedged fuel is expected to be utilized. The fair values of fuel hedges are corroborated using inputs that are readily observable in public markets; therefore, the Company determines fair value of these fuel hedges using Level 2 inputs.

The fair value of the foreign exchange contracts, interest rate and fuel hedge contracts outstanding as of June 30, 2012 and December 31, 2011 is as follows:


	Balance Sheet Location	Fair Value at
		June 30,		December 31,
Asset derivatives:		2012		2011
Derivatives designated as hedges
Fuel hedge contracts	Other current assets	$	-	$	449
Derivatives not designated as hedges
Interest rate swaps	Other current assets		416		755
Foreign exchange contracts	Other current assets		137		155
Total asset derivatives		$	553	$	1,359

Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	1,695	$	-

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 June 30, 2012. The senior notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the senior notes. The fair value of the senior notes was $250,000 at June 30, 2012, which is a Level 1 fair value measurement as the senior notes value was obtained using quoted prices in active markets.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Accrued Expenses

6 Months Ended

Jun. 30, 2012

Accrued Expenses [Abstract]

Accrued Expenses

5. Accrued expenses

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


	2012		2011

Insurance	$	7,736	$	8,285
Interest		7,717		7,759
Payroll and employee benefits		6,608		10,763
Income and other taxes		1,868		1,261
Fuel hedge liability		1,695		-
Percentage of completion adjustment		525		1,855
Other		1,328		1,198
Total accrued expenses	$	27,477	$	31,121

Long-term Debt	6 Months Ended
Long-term Debt	Jun. 30, 2012
Long-term Debt [Abstract]
Long-Term Debt	6. Long-term debt On June 4, 2012, the Company entered into a senior revolving credit agreement (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender and an Issuing Lender, Bank of America, N.A., as Syndication Agent and PNC Bank, National Association, BMO Harris Bank N.A. and Fifth Third Bank, as Co-Documentation Agents. The Credit Agreement, which replaced the Company’s former revolving credit agreement, provides for a senior revolving credit facility in an aggregate principal amount of up to $175,000, subfacilities for the issuance of standby letters of credit up to a $125,000 sublimit, multicurrency borrowings up to a $50,000 sublimit and swingline loans up to a $10,000 sublimit. The Credit Agreement also includes an incremental loans feature that will allow the Company to increase the senior revolving credit facility by an aggregate principal amount of up to $50,000. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, 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%. The revolving credit facility is an unsecured facility and will remain unsecured provided the Company maintains a total leverage ratio less than or equal to 3.75 to 1.00 as of the end of each fiscal quarter. If the leverage ratio exceeds 3.75 to 1.00, or an event of default occurs and is not cured within the applicable grace period, the revolving credit facility will cease to remain unsecured. In the event of the facility becomes secured, outstanding obligations shall be automatically secured by certain vessels and all domestic accounts receivable, subject to the liens and interests of other parties (including the Company’s bonding provider) holding first priority perfected liens. The new credit facility contains affirmative, negative and financial covenants customary for financings of this type. The Credit Agreement also contains customary events of default (including non-payment of principal or interest on any material debt and breaches of covenants) as well as events of default relating to certain actions by the Company’s surety bonding provider. At June 30, 2012 the Company was in compliance with its debt covenants.

Share Based Compensation	6 Months Ended
Share Based Compensation	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]
Share-based compensation	7. Share-based compensation The Company’s 2007 Long-Term Incentive Plan permits the granting of stock options, stock appreciation rights, restricted stock and restricted stock units to its employees and directors for up to 5.8 million shares of common stock. In June 2012, the Company granted 497 thousand options to purchase shares of common stock and 273 thousand restricted stock units to certain employees pursuant to the plan. In addition, all non-employee directors on the Company’s board of directors are paid a portion of their board related compensation in stock grants. Compensation cost charged to expense related to these share-based compensation arrangements was $699 and $1,714, respectively, for the three and six months ended June 30, 2012 and $323 and $843, respectively, for the three and six months ended June 30, 2011.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment Information

6 Months Ended

Jun. 30, 2012

Segment Information [Abstract]

Segment Information

8. Segment information

The Company and its subsidiaries currently operate in two reportable segments: dredging and demolition. The Company’s financial reporting systems present various data for management to run the business, including profit and loss statements prepared according to the segments presented. Management uses operating income to evaluate performance between the two segments. Segment information for the periods presented is provided as follows:


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2012		2011		2012		2011
Dredging
Contract revenues	$	134,772	$	125,085	$	257,133	$	261,682
Operating income		12,974		13,594		17,873		31,415

Demolition
Contract revenues	$	31,760	$	29,874	$	64,306	$	48,615
Operating income (loss)		(448)		(4,937)		1,439		(7,147)

Total
Contract revenues	$	166,532	$	154,959	$	321,439	$	310,297
Operating income		12,526		8,657		19,312		24,268

Dredging contract revenues for the three and six months ended June 30, 2012 are net of $62 and $1,374 in intersegment revenues. Demolition contract revenues for both the three and six months ended June 30, 2012 are net of $75 in intersegment revenues. In addition, foreign dredging revenue of $20,848 and $38,873 for the three and six months ended June 30, 2012, respectively, and $16,065 and $37,936 for the three and six months ended June 30, 2011, respectively, was primarily attributable to work done in the Middle East.

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.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments And Contingencies	6 Months Ended
Commitments And Contingencies	Jun. 30, 2012
Commitments And Contingencies [Abstract]
Commitments And Contingencies	9. Commitments and contingencies *Commercial commitments* The obligations of Great Lakes under the Credit Agreement are unconditionally guaranteed, on a joint and several basis, by each existing and subsequently acquired or formed material direct and indirect domestic subsidiary of the Company. As of June 30, 2012, the Company had no borrowings and $33,447 of letters of credit outstanding, resulting in $141,553 of availability under the Credit Agreement. At June 30, 2012, the Company was in compliance with its various covenants under its Credit Agreement. Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some demolition projects. In September 2011, the Company entered into a new bonding agreement with Zurich American Insurance Company (“Zurich”) under which the Company can obtain performance, bid and payment bonds. The new bonding agreement contains no restrictive covenants and lesser collateral requirements than the previous bonding agreement. The Company has used Zurich for all bonding requirements beginning in September 2011. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At June 30, 2012, the Company had outstanding performance bonds valued at approximately $269,419; however, the revenue value remaining in backlog related to these projects totaled approximately $147,080. 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 June 30, 2012, Great Lakes had $11,725 of letters of credit outstanding under this facility. At June 30, 2012, the Company also had $250,000 of 7.375% senior notes outstanding, which mature in February 2019. Certain foreign projects performed by the Company have warranty periods, typically spanning no more than one to three years beyond project completion, whereby the Company retains responsibility to maintain the project site to certain specifications during the warranty period. Generally, any potential liability of the Company is mitigated by insurance, shared responsibilities with consortium partners, and/or recourse to owner-provided specifications. *Legal proceedings and other contingencies* As is customary with negotiated contracts and modifications or claims to competitively bid contracts with the federal government, the government has the right to audit the books and records of the Company to ensure compliance with such contracts, modifications, or claims, and the applicable federal laws. The government has the ability to seek a price adjustment based on the results of such audit. Any such audits have not had, and are not expected to have, a material impact on the financial position, operations, or cash flows of the Company. Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against the Company and certain of its subsidiaries. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved, or settled adversely to the Company. Although the Company is subject to various claims and legal actions that arise in the ordinary course of business, except as described below, the Company is not currently a party to any material legal proceedings or environmental claims. The Company records an accrual when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. The Company does not believe any of these proceedings, individually or in the aggregate, would be expected to have a material effect on results of operations, cash flows or financial condition. The Company or its former subsidiary, NATCO Limited Partnership, was named as a defendant in approximately 251 asbestos-related personal injury lawsuits, the majority of which were filed between 1989 and 2000. The claims were filed on behalf of seamen or their personal representatives alleging injury or illness from exposure to asbestos while employed as seamen on Company-owned vessels. In these cases, the Company is typically one of many defendants, including manufacturers and suppliers of products containing asbestos, as well as other vessel owners. Following certain administrative proceedings, counsel for plaintiffs agreed to name a group of cases that they intended to pursue and to dismiss the remaining cases without prejudice. Plaintiffs previously named 40 cases against the Company that they intended to pursue, each of which involves one plaintiff. The remaining cases against the Company were dismissed without prejudice. Plaintiffs in the dismissed cases could file a new lawsuit if they develop a new disease allegedly caused by exposure to asbestos on board our vessels. Of the 40 named cases, three were subsequently dismissed, leaving 37 cases remaining. The Company is presently unable to quantify the amounts of damages being sought in the remaining lawsuits because none of the complaints specify a damage amount. Based on preliminary discovery and settlement demands received to date, the Company does not believe that it is probable that losses from these claims could be material, and an estimate of a range of losses relating to these claims cannot reasonably be made. Based on the foregoing, management does not believe that any of the remaining 37 lawsuits, individually or in the aggregate, will have a material impact on our business, financial position, results of operations or cash flows. On August 26, 2009, the Company’s subsidiary, NASDI, LLC (“NASDI”), received a letter stating that the Attorney General for the Commonwealth of Massachusetts is investigating alleged violations of the Massachusetts Solid Waste Act. The Company believes that the Massachusetts Attorney General is investigating illegal dumping activities at a dump site NASDI contracted with to have waste materials disposed of between September 2007 and July 2008. Per the Massachusetts Attorney General’s request, NASDI executed a tolling agreement regarding the matter in 2009 and engaged in further discussions with the Massachusetts Attorney General’s office in the second quarter of 2011 but has had no further contact with the Massachusetts Attorney General’s office since then. The matter remains open, and, to the Company’s knowledge, no proceedings have currently been initiated against NASDI. Should a claim be brought, NASDI intends to defend itself vigorously. Based on consideration of all of the facts and circumstances now known, the Company does not believe this claim will have a material impact on its business, financial position, results of operations or cash flows. On March 27, 2011, NASDI received a subpoena from a federal grand jury in the District of Massachusetts directing NASDI to furnish certain documents relating to certain projects performed by NASDI since January 2005. The Company conducted an internal investigation into this matter and continues to fully cooperate with the federal grand jury subpoena. Based on the early stage of the U.S. Department of Justice’s investigation and the limited information known to the Company, the Company cannot predict the outcome of the investigation, the U.S. Attorney’s views of the issues being investigated, any action the U.S. Attorney may take, or the impact, if any, that this matter may have on the Company’s business, financial position, results of operations or cash flows. The Company has not accrued any amounts with respect to these two NASDI matters as the Company does not believe, based on information currently known to it, that a loss relating to these matters is probable, and an estimate of a range of potential losses relating to these matters cannot reasonably be made. During the prior 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, and briefing on the appeal is expected to be completed before the end of the year. The Company cannot be assured when the appeal will be heard or predict the outcome of the appellate process.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Acquisition Of Noncontrolling Interest	6 Months Ended
Acquisition Of Noncontrolling Interest	Jun. 30, 2012
Acquisition Of Noncontrolling Interest [Abstract]
Acquisition Of Noncontrolling Interest	10. Acquisition of noncontrolling interest The Company previously owned 65% of the profits interests of NASDI. Effective January 1, 2011 the Company reacquired Mr. Christopher Berardi’s 35% membership interest in NASDI for no cost per the terms of NASDI’s limited liability company agreement. This resulted in the elimination of noncontrolling interest of $1,973 during the first quarter ended March 31, 2011. The Company now owns 100% of NASDI. In March 2011, Mr. Berardi resigned his employment with the Company’s demolition segment effective April 29, 2011. Mr. Berardi’s resignation and the repurchase of his NASDI membership interest also resulted in the reversal of a $1,933 accrual established in conjunction with a prior restructuring of ownership interest in NASDI. This reversal was recorded directly to equity as part of the reacquisition of the noncontrolling interest.

- Definition

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

+ References + Details

Subsidiary Guarantors

6 Months Ended

Jun. 30, 2012

Subsidiary Guarantors [Abstract]

Subsidiary Guarantors

11. Subsidiary guarantors

The Company’s long-term debt at June 30, 2012 includes $250,000 of 7.375% senior notes due February 1, 2019. The Company’s obligations under these senior unsecured notes are guaranteed by the Company’s wholly-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 June 30, 2012 and December 31, 2011;


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

(iii)

statements of cash flows for the six months ended June 30, 2012 and 2011.


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF JUNE 30, 2012
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	70,623	$	168	$	-	$	-	$	70,791
Accounts receivable — net		112,289		608		-		-		112,897
Receivables from affiliates		56,184		8,344		7,685		(72,213)		-
Contract revenues in excess of billings		50,932		191		-		(234)		50,889
Inventories		48,696		-		-		-		48,696
Prepaid expenses and other current assets		36,429		30		6,473		-		42,932
Total current assets		375,153		9,341		14,158		(72,447)		326,205

PROPERTY AND EQUIPMENT—Net		316,408		52		-		-		316,460
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,369		360		-		-		98,729
INVENTORIES — Noncurrent		23,206		-		-		-		23,206
INVESTMENTS IN JOINT VENTURES		6,899		-		-		-		6,899
INVESTMENTS IN SUBSIDIARIES		3,397		-		645,270		(648,667)		-
OTHER		11,539		3		6,919		-		18,461
TOTAL	$	834,971	$	9,756	$	666,347	$	(721,114)	$	789,960

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	79,668	$	650	$	334	$	-	$	80,652
Payables to affiliates		60,546		3,659		8,180		(72,385)		-
Accrued expenses		18,290		718		8,469		-		27,477
Billings in excess of contract revenues		19,939		122		-		(62)		19,999
Current portion of long term debt		2,658		-		-		-		2,658
Total current liabilities		181,101		5,149		16,983		(72,447)		130,786

LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		(74)		-		102,994		-		102,920
OTHER		7,384		-		769		-		8,153
Total liabilities		190,911		5,149		370,746		(72,447)		494,359

Total Great Lakes Dredge & Dock Corporation Equity		644,060		4,607		295,373		(648,667)		295,373
NONCONTROLLING INTERESTS		-		-		228		-		228
TOTAL EQUITY		644,060		4,607		295,601		(648,667)		295,601
TOTAL	$	834,971	$	9,756	$	666,347	$	(721,114)	$	789,960


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2011
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	108,985	$	4,303	$	-	$	-	$	113,288
Accounts receivable — net		118,530		1,738		-		-		120,268
Receivables from affiliates		79,683		7,729		49,724		(137,136)		-
Contract revenues in excess of billings		26,323		153		-		(64)		26,412
Inventories		33,426		-		-		-		33,426
Prepaid expenses and other current assets		15,929		125		16,330		-		32,384
Total current assets		382,876		14,048		66,054		(137,200)		325,778

PROPERTY AND EQUIPMENT—Net		310,459		61		-		-		310,520
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,474		389		-		-		98,863
INVENTORIES — Noncurrent		30,103		-		-		-		30,103
INVESTMENTS IN JOINT VENTURES		6,923		-		-		-		6,923
INVESTMENTS IN SUBSIDIARIES		4,385		-		627,754		(632,139)		-
OTHER		10,729		3		5,547		(6)		16,273
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	81,971	$	774	$	-	$	-	$	82,745
Payables to affiliates		85,865		7,234		44,053		(137,152)		-
Accrued expenses		22,445		629		8,047		-		31,121
Billings in excess of contract revenues		13,607		68		-		(48)		13,627
Current portion of long term debt		3,033		-		-		-		3,033
Total current liabilities		206,921		8,705		52,100		(137,200)		130,526

LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		399		-		103,959		(6)		104,352
OTHER		7,786		-		759		-		8,545
Total liabilities		217,606		8,705		406,818		(137,206)		495,923

Total Great Lakes Dredge & Dock Corporation Equity		626,343		5,796		291,969		(632,139)		291,969
NONCONTROLLING INTERESTS		-		-		568		-		568
TOTAL EQUITY		626,343		5,796		292,537		(632,139)		292,537
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED JUNE 30, 2012
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	166,467	$	2,251	$	-	$	(2,186)	$	166,532
Costs of contract revenues		(142,315)		(2,514)		-		2,186		(142,643)
Gross profit		24,152		(263)		-		-		23,889

OPERATING EXPENSES:
General and administrative expenses		10,679		162		615		-		11,456
Gain on sale of assets—net		(93)		-		-		-		(93)
Operating income (loss)		13,566		(425)		(615)		-		12,526

Interest expense—net		(257)		(23)		(5,103)		-		(5,383)
Equity in earnings of subsidiaries		(223)		-		12,350		(12,127)		-
Equity in loss of joint ventures		(8)		-		-		-		(8)
Loss on foreign currency transactions—net		(21)		-		-		-		(21)

Income (loss) before income taxes		13,057		(448)		6,632		(12,127)		7,114

Income tax (provision) benefit		(482)		-		(2,286)		-		(2,768)

Net income (loss)		12,575		(448)		4,346		(12,127)		4,346
Net loss attributable to noncontrolling interests		-		-		91		-		91
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	12,575	$	(448)	$	4,437	$	(12,127)	$	4,437


Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	10,813	$	(456)	$	2,667	$	(10,357)	$	2,667


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED JUNE 30, 2011
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	151,223	$	6,269	$	-	$	(2,533)	$	154,959
Costs of contract revenues		(132,879)		(4,847)		-		2,533		(135,193)
Gross profit		18,344		1,422		-		-		19,766

OPERATING EXPENSES:
General and administrative expenses		12,522		208		892		-		13,622
Gain on sale of assets—net		(2,513)		-		-		-		(2,513)
Operating income (loss)		8,335		1,214		(892)		-		8,657

Interest expense—net		(49)		(54)		(4,808)		-		(4,911)
Equity in earnings (loss) of subsidiaries		1,160		-		11,567		(12,727)		-
Equity in loss of joint ventures		(123)		-		-		-		(123)
Loss on extinguishment of debt		-		-		-		-		-

Income (loss) before income taxes		9,323		1,160		5,867		(12,727)		3,623

Income tax benefit (provision)		2,244		-		(3,699)		-		(1,455)

Net income (loss)		11,567		1,160		2,168		(12,727)		2,168
Net income attributable to noncontrolling interests		-		-		(462)		-		(462)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	11,567	$	1,160	$	1,706	$	(12,727)	$	1,706


Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	10,753	$	1,160	$	892	$	(11,913)	$	892


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE SIX MONTHS ENDED JUNE 30, 2012
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	321,911	$	4,050	$	-	$	(4,522)	$	321,439
Costs of contract revenues		(277,482)		(4,568)		-		4,522		(277,528)
Gross profit		44,429		(518)		-		-		43,911

OPERATING EXPENSES:
General and administrative expenses		23,248		348		1,127		-		24,723
Gain on sale of assets—net		(135)		-		11		-		(124)
Operating income (loss)		21,316		(866)		(1,138)		-		19,312

Interest expense—net		(538)		(51)		(10,053)		-		(10,642)
Equity in earnings of subsidiaries		(602)		-		18,697		(18,095)		-
Equity in loss of joint ventures		(24)		-		-		-		(24)
Loss on foreign currency transactions—net		(15)		-		-		-		(15)

Income (loss) before income taxes		20,137		(917)		7,506		(18,095)		8,631

Income tax (provision) benefit		(1,125)		-		(2,207)		-		(3,332)

Net income (loss)		19,012		(917)		5,299		(18,095)		5,299
Net loss attributable to noncontrolling interests		-		-		206		-		206
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	19,012	$	(917)	$	5,505	$	(18,095)	$	5,505


Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	17,724	$	(921)	$	4,213	$	(16,803)	$	4,213


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE SIX MONTHS ENDED JUNE 30, 2011
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	305,262	$	9,586	$	-	$	(4,551)	$	310,297
Costs of contract revenues		(259,788)		(7,852)		-		4,551		(263,089)
Gross profit		45,474		1,734		-		-		47,208

OPERATING EXPENSES:
General and administrative expenses		23,726		421		1,564		-		25,711
Gain on sale of assets—net		(2,771)		-		-		-		(2,771)
Operating income (loss)		24,519		1,313		(1,564)		-		24,268

Interest expense—net		(129)		(99)		(10,633)		-		(10,861)
Equity in earnings (loss) of subsidiaries		1,214		-		28,118		(29,332)		-
Equity in loss of joint ventures		(714)		-		-		-		(714)
Loss on extinguishment of debt		-		-		(5,145)		-		(5,145)

Income (loss) before income taxes		24,890		1,214		10,776		(29,332)		7,548

Income tax benefit (provision)		3,228		-		(6,210)		-		(2,982)

Net income (loss)		28,118		1,214		4,566		(29,332)		4,566
Net income attributable to noncontrolling interests		-		-		(468)		-		(468)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	28,118	$	1,214	$	4,098	$	(29,332)	$	4,098


Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	27,870	$	1,214	$	3,850	$	(29,084)	$	3,850


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2012
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	9,512	$	331	$	(25,028)	$	-	$	(15,185)

INVESTING ACTIVITIES:
Purchases of property and equipment		(22,428)		-		-		-		(22,428)
Proceeds from dispositions of property and equipment		226		-		-		-		226

Net cash flows used in investing activities		(22,202)		-		-		-		(22,202)

FINANCING ACTIVITIES:
Deferred financing fees		-		-		(2,039)		-		(2,039)
Distributions paid to minority interests		-		-		(133)		-		(133)
Dividends paid		-		-		(2,482)		-		(2,482)
Dividend equivalents paid on restricted stock units		-		-		(22)		-		(22)
Taxes paid on settlement of vested share awards		-		-		(212)		-		(212)
Net change in accounts with affiliates		(25,246)		(4,477)		29,723		-		-
Capital contributions		-		-		-		-		-
Repayments of equipment debt		(426)		-		-		-		(426)
Exercise of stock options		-		-		75		-		75
Excess income tax benefit from share-based compensation		-		-		118		-		118

Net cash flows provided by (used in) financing activities		(25,672)		(4,477)		25,028		-		(5,121)

Effect of foreign currency exchange rates on cash and cash equivalents		-		11		-		-		11

Net decrease in cash and cash equivalents		(38,362)		(4,135)		-		-		(42,497)

Cash and cash equivalents at beginning of period		108,985		4,303		-		-		113,288

Cash and cash equivalents at end of period	$	70,623	$	168	$	-	$	-	$	70,791



GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2011
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	3,004	$	3,230	$	(16,679)	$	-	$	(10,445)

INVESTING ACTIVITIES:
Purchases of property and equipment		(13,583)		-		-		-		(13,583)
Proceeds from dispositions of property and equipment		7,275		-		-		-		7,275

Net cash flows used in investing activities		(6,308)		-		-		-		(6,308)

FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		-		-		250,000		-		250,000
Redemption of 7 3/4% senior subordinated notes		-		-		(175,000)		-		(175,000)
Senior subordinated notes redemption premium		-		-		(2,264)		-		(2,264)
Deferred financing fees		-		-		(5,829)		-		(5,829)
Dividends paid		-		-		(2,236)		-		(2,236)
Dividend equivalents paid on restricted stock units		-		-		(11)		-		(11)
Taxes paid on vested share awards		-		-		(250)				(250)
Net change in accounts with affiliates		50,703		(2,893)		(47,810)		-		-
Repayments of equipment debt		(217)		-		-		-		(217)
Exercise of stock options		-		-		27		-		27
Excess income tax benefit from share-based compensation		-		-		52		-		52

Net cash flows provided by financing activities		50,486		(2,893)		16,679		-		64,272

Net increase in cash and cash equivalents		47,182		337		-		-		47,519

Cash and cash equivalents at beginning of period		48,416		62		-		-		48,478

Cash and cash equivalents at end of period	$	95,598	$	399	$	-	$	-	$	95,997

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Computations For Basic And Diluted Earnings Per Share From Continuing Operations


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2012		2011		2012		2011
Net income attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	4,437	$	1,706	$	5,505	$	4,098

Weighted-average common shares outstanding — basic		59,171		58,875		59,105		58,830
Effect of stock options and restricted stock units		363		309		388		398

Weighted-average common shares outstanding — diluted		59,534		59,184		59,493		59,228

Earnings per share — basic	$	0.07	$	0.03	$	0.09	$	0.07
Earnings per share — diluted	$	0.07	$	0.03	$	0.09	$	0.07

Accounts Receivable And Contracts In Progress (Tables)

6 Months Ended

Jun. 30, 2012

Accounts Receivable And Contracts In Progress [Abstract]

Schedule Of Accounts Receivable


	June 30,		December 31,
	2012		2011
Completed contracts	$	30,713	$	38,317
Contracts in progress		71,506		69,469
Retainage		21,220		20,692
		123,439		128,478
Allowance for doubtful accounts		(1,500)		(1,839)

Total accounts receivable—net	$	121,939	$	126,639

Current portion of accounts receivable—net	$	112,897	$	120,268
Long-term accounts receivable and retainage		9,042		6,371
Total accounts receivable—net	$	121,939	$	126,639

Components Of Contracts In Progress


	June 30,		December 31,
	2012		2011
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	366,985	$	173,187
Amounts billed		(317,477)		(152,045)
Costs and earnings in excess of billings for contracts in progress		49,508		21,142

Costs and earnings in excess of billings for completed contracts		1,381		7,459

Total contract revenues in excess of billings	$	50,889	$	28,601

Current portion of contract revenues in excess of billings	$	50,889	$	26,412
Portion included in other noncurrent assets		-		2,189
Total contract revenues in excess of billings	$	50,889	$	28,601

Billings in excess of costs and earnings:
Amounts billed	$	(383,047)	$	(427,797)
Costs and earnings for contracts in progress		363,048		414,170

Total billings in excess of contract revenues	$	(19,999)	$	(13,627)

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

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


				Fair Value Measurements at Reporting Date Using
Description	At June 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Assets
Interest rate swap contracts	$	416	$	-	$	416	$	-
Foreign exchange contracts		137		-		137		-
Total assets measured at fair value	$	553	$	-	$	553	$	-

Liabilities
Fuel hedge contracts	$	1,695	$	-	$	1,695	$	-

				Fair Value Measurements at Reporting Date Using
Description	At December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	449	$	-	$	449	$	-
Interest rate swap contracts		755		-		755		-
Foreign exchange contracts		155		-		155		-
Total assets measured at fair value	$	1,359	$	-	$	1,359	$	-

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


	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2011
Interest rate swap contracts
Balance at January 1,	$	1,264
Total unrealized gains (losses) included in earnings		(568)
Settlements		445
Balance at June 30,	$	1,141


Balance at April 1,	$	1,299
Total unrealized gains (losses) included in earnings		(603)
Settlements		445
Balance at June 30,	$	1,141

Schedule Fair Value Measurements Balance Sheet Location


	Balance Sheet Location	Fair Value at
		June 30,		December 31,
Asset derivatives:		2012		2011
Derivatives designated as hedges
Fuel hedge contracts	Other current assets	$	-	$	449
Derivatives not designated as hedges
Interest rate swaps	Other current assets		416		755
Foreign exchange contracts	Other current assets		137		155
Total asset derivatives		$	553	$	1,359

Liability derivatives:
Derivatives designated as hedges
Fuel hedge contracts	Accrued expenses	$	1,695	$	-

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References + Details

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15
-Subparagraph b-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph c(2), d, e, f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph a, c(1), c(2), c(3), d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2012

Accrued Expenses [Abstract]

Accrued Expenses


	2012		2011

Insurance	$	7,736	$	8,285
Interest		7,717		7,759
Payroll and employee benefits		6,608		10,763
Income and other taxes		1,868		1,261
Fuel hedge liability		1,695		-
Percentage of completion adjustment		525		1,855
Other		1,328		1,198
Total accrued expenses	$	27,477	$	31,121

Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Segment Information [Abstract]

Segment Information


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2012		2011		2012		2011
Dredging
Contract revenues	$	134,772	$	125,085	$	257,133	$	261,682
Operating income		12,974		13,594		17,873		31,415

Demolition
Contract revenues	$	31,760	$	29,874	$	64,306	$	48,615
Operating income (loss)		(448)		(4,937)		1,439		(7,147)

Total
Contract revenues	$	166,532	$	154,959	$	321,439	$	310,297
Operating income		12,526		8,657		19,312		24,268

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Subsidiary Guarantors (Tables)

6 Months Ended

Jun. 30, 2012

Jun. 30, 2011

Subsidiary Guarantors [Abstract]

Condensed Consolidating of Balance Sheet


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF JUNE 30, 2012
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	70,623	$	168	$	-	$	-	$	70,791
Accounts receivable — net		112,289		608		-		-		112,897
Receivables from affiliates		56,184		8,344		7,685		(72,213)		-
Contract revenues in excess of billings		50,932		191		-		(234)		50,889
Inventories		48,696		-		-		-		48,696
Prepaid expenses and other current assets		36,429		30		6,473		-		42,932
Total current assets		375,153		9,341		14,158		(72,447)		326,205

PROPERTY AND EQUIPMENT—Net		316,408		52		-		-		316,460
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,369		360		-		-		98,729
INVENTORIES — Noncurrent		23,206		-		-		-		23,206
INVESTMENTS IN JOINT VENTURES		6,899		-		-		-		6,899
INVESTMENTS IN SUBSIDIARIES		3,397		-		645,270		(648,667)		-
OTHER		11,539		3		6,919		-		18,461
TOTAL	$	834,971	$	9,756	$	666,347	$	(721,114)	$	789,960

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	79,668	$	650	$	334	$	-	$	80,652
Payables to affiliates		60,546		3,659		8,180		(72,385)		-
Accrued expenses		18,290		718		8,469		-		27,477
Billings in excess of contract revenues		19,939		122		-		(62)		19,999
Current portion of long term debt		2,658		-		-		-		2,658
Total current liabilities		181,101		5,149		16,983		(72,447)		130,786

LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/8% SENIOR NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		(74)		-		102,994		-		102,920
OTHER		7,384		-		769		-		8,153
Total liabilities		190,911		5,149		370,746		(72,447)		494,359

Total Great Lakes Dredge & Dock Corporation Equity		644,060		4,607		295,373		(648,667)		295,373
NONCONTROLLING INTERESTS		-		-		228		-		228
TOTAL EQUITY		644,060		4,607		295,601		(648,667)		295,601
TOTAL	$	834,971	$	9,756	$	666,347	$	(721,114)	$	789,960


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEET
AS OF DECEMBER 31, 2011
(In thousands)

ASSETS	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals
CURRENT ASSETS:
Cash and cash equivalents	$	108,985	$	4,303	$	-	$	-	$	113,288
Accounts receivable — net		118,530		1,738		-		-		120,268
Receivables from affiliates		79,683		7,729		49,724		(137,136)		-
Contract revenues in excess of billings		26,323		153		-		(64)		26,412
Inventories		33,426		-		-		-		33,426
Prepaid expenses and other current assets		15,929		125		16,330		-		32,384
Total current assets		382,876		14,048		66,054		(137,200)		325,778

PROPERTY AND EQUIPMENT—Net		310,459		61		-		-		310,520
GOODWILL AND OTHER INTANGIBLE ASSETS—Net		98,474		389		-		-		98,863
INVENTORIES — Noncurrent		30,103		-		-		-		30,103
INVESTMENTS IN JOINT VENTURES		6,923		-		-		-		6,923
INVESTMENTS IN SUBSIDIARIES		4,385		-		627,754		(632,139)		-
OTHER		10,729		3		5,547		(6)		16,273
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	81,971	$	774	$	-	$	-	$	82,745
Payables to affiliates		85,865		7,234		44,053		(137,152)		-
Accrued expenses		22,445		629		8,047		-		31,121
Billings in excess of contract revenues		13,607		68		-		(48)		13,627
Current portion of long term debt		3,033		-		-		-		3,033
Total current liabilities		206,921		8,705		52,100		(137,200)		130,526

LONG TERM NOTE PAYABLE		2,500		-		-		-		2,500
7 3/4% SENIOR SUBORDINATED NOTES		-		-		250,000		-		250,000
DEFERRED INCOME TAXES		399		-		103,959		(6)		104,352
OTHER		7,786		-		759		-		8,545
Total liabilities		217,606		8,705		406,818		(137,206)		495,923

Total Great Lakes Dredge & Dock Corporation Equity		626,343		5,796		291,969		(632,139)		291,969
NONCONTROLLING INTERESTS		-		-		568		-		568
TOTAL EQUITY		626,343		5,796		292,537		(632,139)		292,537
TOTAL	$	843,949	$	14,501	$	699,355	$	(769,345)	$	788,460

Condensed Consolidating of Operations and Comprehensive Income


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED JUNE 30, 2012
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	166,467	$	2,251	$	-	$	(2,186)	$	166,532
Costs of contract revenues		(142,315)		(2,514)		-		2,186		(142,643)
Gross profit		24,152		(263)		-		-		23,889

OPERATING EXPENSES:
General and administrative expenses		10,679		162		615		-		11,456
Gain on sale of assets—net		(93)		-		-		-		(93)
Operating income (loss)		13,566		(425)		(615)		-		12,526

Interest expense—net		(257)		(23)		(5,103)		-		(5,383)
Equity in earnings of subsidiaries		(223)		-		12,350		(12,127)		-
Equity in loss of joint ventures		(8)		-		-		-		(8)
Loss on foreign currency transactions—net		(21)		-		-		-		(21)

Income (loss) before income taxes		13,057		(448)		6,632		(12,127)		7,114

Income tax (provision) benefit		(482)		-		(2,286)		-		(2,768)

Net income (loss)		12,575		(448)		4,346		(12,127)		4,346
Net loss attributable to noncontrolling interests		-		-		91		-		91
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	12,575	$	(448)	$	4,437	$	(12,127)	$	4,437


Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	10,813	$	(456)	$	2,667	$	(10,357)	$	2,667


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED JUNE 30, 2011
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

Contract revenues	$	151,223	$	6,269	$	-	$	(2,533)	$	154,959
Costs of contract revenues		(132,879)		(4,847)		-		2,533		(135,193)
Gross profit		18,344		1,422		-		-		19,766

OPERATING EXPENSES:
General and administrative expenses		12,522		208		892		-		13,622
Gain on sale of assets—net		(2,513)		-		-		-		(2,513)
Operating income (loss)		8,335		1,214		(892)		-		8,657

Interest expense—net		(49)		(54)		(4,808)		-		(4,911)
Equity in earnings (loss) of subsidiaries		1,160		-		11,567		(12,727)		-
Equity in loss of joint ventures		(123)		-		-		-		(123)
Loss on extinguishment of debt		-		-		-		-		-

Income (loss) before income taxes		9,323		1,160		5,867		(12,727)		3,623

Income tax benefit (provision)		2,244		-		(3,699)		-		(1,455)

Net income (loss)		11,567		1,160		2,168		(12,727)		2,168
Net income attributable to noncontrolling interests		-		-		(462)		-		(462)
Net income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	11,567	$	1,160	$	1,706	$	(12,727)	$	1,706


Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$	10,753	$	1,160	$	892	$	(11,913)	$	892

Condensed Consolidating of Cash Flows


GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2012
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	9,512	$	331	$	(25,028)	$	-	$	(15,185)

INVESTING ACTIVITIES:
Purchases of property and equipment		(22,428)		-		-		-		(22,428)
Proceeds from dispositions of property and equipment		226		-		-		-		226

Net cash flows used in investing activities		(22,202)		-		-		-		(22,202)

FINANCING ACTIVITIES:
Deferred financing fees		-		-		(2,039)		-		(2,039)
Distributions paid to minority interests		-		-		(133)		-		(133)
Dividends paid		-		-		(2,482)		-		(2,482)
Dividend equivalents paid on restricted stock units		-		-		(22)		-		(22)
Taxes paid on settlement of vested share awards		-		-		(212)		-		(212)
Net change in accounts with affiliates		(25,246)		(4,477)		29,723		-		-
Capital contributions		-		-		-		-		-
Repayments of equipment debt		(426)		-		-		-		(426)
Exercise of stock options		-		-		75		-		75
Excess income tax benefit from share-based compensation		-		-		118		-		118

Net cash flows provided by (used in) financing activities		(25,672)		(4,477)		25,028		-		(5,121)

Effect of foreign currency exchange rates on cash and cash equivalents		-		11		-		-		11

Net decrease in cash and cash equivalents		(38,362)		(4,135)		-		-		(42,497)

Cash and cash equivalents at beginning of period		108,985		4,303		-		-		113,288

Cash and cash equivalents at end of period	$	70,623	$	168	$	-	$	-	$	70,791



GREAT LAKES DREDGE & DOCK CORPORATION AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2011
(In thousands)

	Subsidiary Guarantors		Non-Guarantor Subsidiaries		GLDD Corporation		Eliminations		Consolidated Totals

OPERATING ACTIVITIES:
Net cash flows provided by (used in) operating activities	$	3,004	$	3,230	$	(16,679)	$	-	$	(10,445)

INVESTING ACTIVITIES:
Purchases of property and equipment		(13,583)		-		-		-		(13,583)
Proceeds from dispositions of property and equipment		7,275		-		-		-		7,275

Net cash flows used in investing activities		(6,308)		-		-		-		(6,308)

FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes		-		-		250,000		-		250,000
Redemption of 7 3/4% senior subordinated notes		-		-		(175,000)		-		(175,000)
Senior subordinated notes redemption premium		-		-		(2,264)		-		(2,264)
Deferred financing fees		-		-		(5,829)		-		(5,829)
Dividends paid		-		-		(2,236)		-		(2,236)
Dividend equivalents paid on restricted stock units		-		-		(11)		-		(11)
Taxes paid on vested share awards		-		-		(250)				(250)
Net change in accounts with affiliates		50,703		(2,893)		(47,810)		-		-
Repayments of equipment debt		(217)		-		-		-		(217)
Exercise of stock options		-		-		27		-		27
Excess income tax benefit from share-based compensation		-		-		52		-		52

Net cash flows provided by financing activities		50,486		(2,893)		16,679		-		64,272

Net increase in cash and cash equivalents		47,182		337		-		-		47,519

Cash and cash equivalents at beginning of period		48,416		62		-		-		48,478

Cash and cash equivalents at end of period	$	95,598	$	399	$	-	$	-	$	95,997

Basis Of Presentation (Details)	36 Months Ended
Basis Of Presentation (Details)	Dec. 31, 2011	Jul. 01, 2011
Maximum [Member]
Basis Of Presentation [Line Items]
Average equipment-related costs of total costs of contract revenue	25.00%
Minimum [Member]
Basis Of Presentation [Line Items]
Average equipment-related costs of total costs of contract revenue	21.00%
Dredging [Member]
Basis Of Presentation [Line Items]
Fair value in excess of carrying value		35.00%
Demolition [Member]
Basis Of Presentation [Line Items]
Fair value in excess of carrying value		8.00%

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0	0
Net income attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$ 4,437	$ 1,706	$ 5,505	$ 4,098
Weighted-average common shares outstanding - basic	59,171	58,875	59,105	58,830
Effect of stock options and restricted stock units	363	309	388	398
Weighted-average common shares outstanding - diluted	59,534	59,184	59,493	59,228
Earnings per share - basic	$ 0.07	$ 0.03	$ 0.09	$ 0.07
Earnings per share - diluted	$ 0.07	$ 0.03	$ 0.09	$ 0.07

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Accounts Receivable And Contracts In Progress (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Accounts Receivable [Line Items]
Retainage	$ 21,220	$ 20,692
Accounts Receivable, Gross	123,439	128,478
Allowance for doubtful accounts	(1,500)	(1,839)
Total accounts receivable	121,939	126,639
Current portion of accounts receivable-net	112,897	120,268
Long-term accounts receivable and retainage	9,042	6,371
Completed Contracts [Member]
Accounts Receivable [Line Items]
Contracts	30,713	38,317
Contracts In Progress [Member]
Accounts Receivable [Line Items]
Contracts	$ 71,506	$ 69,469

Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Costs and earnings in excess of billings on contracts in progress	$ 49,508	$ 21,142
Costs and earnings in excess of billings for completed contracts	1,381	7,459
Total contract revenues in excess of billings	50,889	28,601
Current portion of contract revenues in excess of billings	50,889	26,412
Portion included in other noncurrent assets		2,189
Total billings in excess of contract revenues	(19,999)	(13,627)
Costs And Earnings In Excess Of Billings [Member]
Costs and earnings for contracts in progress	366,985	173,187
Amounts billed	(317,477)	(152,045)
Billings In Excess Of Costs And Earnings [Member]
Costs and earnings for contracts in progress	363,048	414,170
Amounts billed	$ (383,047)	$ (427,797)

Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2012

Jun. 30, 2011

Jun. 30, 2012

Jun. 30, 2011

Dec. 31, 2011

Jan. 31, 2011

May 31, 2009

Derivative asset, notional amount

$ 50,000

Derivative, average fixed interest rate

7.75%

Derivative underlying hedge percent

80.00%

Derivative, nonmonetary notional amount

5,000,000

Senior Notes

$ 250,000

Reclassification of derivative gain (loss) to earnings

^[1]

(143)

$ 444

263

$ 1,067

Fair value hedge liabilities

$ 1,695

Fair value hedge assets

$ 449

Senior notes interest rate

7.375%

3.29

2.65

Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member]

Senior Notes

$ 250,000

[1]	Net of income tax (expense) benefit of $94 and $(295) for the three months ended June 30, 2012 and 2011, respectively, and $(175) and $(709) for the six months ended June 30, 2012 and 2011, respectively.

Fair Value Measurements (Fair Value Measurements at Reporting Date Using) (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Assets, fair value disclosure	$ 553	$ 1,359
Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure	553	1,359
Fuel Hedge Contracts [Member]
Assets, fair value disclosure		449
Liabilities, fair value disclosure	1,695
Fuel Hedge Contracts [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		449
Liabilities, fair value disclosure	1,695
Foreign Exchange Contract [Member]
Assets, fair value disclosure	137	155
Foreign Exchange Contract [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure	137	155
Interest Rate Contract [Member]
Assets, fair value disclosure	416	755
Interest Rate Contract [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure	$ 416	$ 755

Fair Value Measurements (Fair Value Measurements Using Significant Unobservable) (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Beginning Balance	$ 1,299	$ 1,264
Fair value, measurement with unobservable inputs reconciliation, recurring basis, gain (loss) included in other comprehensive income (Loss)	(603)	(568)
Settlement	445	445
Ending Balance	$ 1,141	$ 1,141

Fair Value Measurements (Balance Sheet Location) (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Derivative asset, fair value, net,	$ 553	$ 1,359
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Other Current Assets [Member]
Derivative asset, fair value, gross asset	416	755
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Other Current Assets [Member]
Derivative asset, fair value, gross asset	137	155
Fuel Hedge Contracts [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivative asset, fair value, gross asset		$ 449
Fuel Hedge Contracts [Member] \| Designated as Hedging Instrument [Member] \| Accrued Liabilities [Member]
Derivative asset, fair value, gross liability	$ 1,695

Accrued Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
Insurance	$ 7,736	$ 8,285
Interest	7,717	7,759
Payroll and employee benefits	6,608	10,763
Income and other taxes	1,868	1,261
Fuel hedge liability	1,695
Percentage of completion adjustment	525	1,855
Other	1,328	1,198
Total accrued expenses	27,477	31,121
GLDD Corporation [Member]
Total accrued expenses	$ 8,469	$ 8,047

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

Long-term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 04, 2012
Standby Letters of Credit [Member]
Line of credit facility, maximum borrowing capacity		$ 125,000
Revolving Credit Facility [Member]
Line of credit facility, maximum borrowing capacity		175,000
Line of credit facility optional increase capacity		50,000
Revolving credit facility, interest rate description	Depending on the Company's consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company of either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50%.
Multicurrency [Member]
Line of credit facility, maximum borrowing capacity		50,000
Swingline Loans [Member]
Line of credit facility, maximum borrowing capacity		$ 10,000
Maximum [Member] \| LIBOR Rate [Member] \| Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	2.50%
Maximum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	1.50%
Minimum [Member] \| LIBOR Rate [Member] \| Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	1.50%
Minimum [Member] \| Base Rate [Member] \| Revolving Credit Facility [Member]
Revolving credit facility, basis spread on variable rate	0.50%

Share Based Compensation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2007
Share-based compensation arrangement by share-based payment award, number of shares available for grant					5,800
Allocated share-based compensation expense	$ 699	$ 323	$ 1,714	$ 843
Stock Options [Member]
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	497
Restricted Stock [Member]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period	273

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Segment Information (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Contract revenues	$ 166,532	$ 154,959	$ 321,439	$ 310,297
Operating income (loss)	12,526	8,657	19,312	24,268
Foreign [Member]
Contract revenues	20,848	16,065	38,873	37,936
Dredging [Member]
Contract revenues	134,772	125,085	257,133	261,682
Operating income (loss)	12,974	13,594	17,873	31,415
Segment reporting information, intersegment revenue	62		1,374
Demolition [Member]
Contract revenues	31,760	29,874	64,306	48,615
Operating income (loss)	(448)	$ (4,937)	1,439	$ (7,147)
Segment reporting information, intersegment revenue	$ 75		$ 75

Commitments And Contingencies (Details)	6 Months Ended
Commitments And Contingencies (Details)	Jun. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jan. 31, 2011 USD ($)
Letters of credit outstanding	$ 33,447,000
Letter of credit remaining borrowing capacity	$ 141,553,000
Senior notes interest rate	7.375%		7.375%
Outstanding performance bonds	$ 269,419,000
Revenue value remaining from outstanding performance bonds	147,080,000
Senior Notes	$ 250,000,000	$ 250,000,000	$ 250,000,000
Asbestos related personal lawsuit injury	251
Actual cases	$ 40
Dismissal cases	3
Cases pending	37
Maximum [Member]
Bids bond range	$ 10,000,000
Judgement	13,272,000
Minimum [Member]
Bids bond range	1,000,000
Judgement	11,736,000
Foreign Line of Credit [Member]
Letters of credit outstanding	11,725,000
Letters of credit , maximum borrowing capacity	$ 24,000,000

Acquisition Of Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2011	Jun. 30, 2011	Jan. 02, 2011	Dec. 31, 2010
Acquisition Of Noncontrolling Interest [Abstract]
Owned profits interests			100.00%	65.00%
Reacquired membership interest				35.00%
Acquisition of Noncontrolling Interest	$ 1,973	$ 1,933

Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011	Jan. 31, 2011
Subsidiary Guarantors [Abstract]
Senior Notes	$ 250,000	$ 250,000	$ 250,000
Senior notes interest rate	7.375%		7.375%

Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 70,791	$ 113,288
Accounts receivable - net	112,897	120,268
Contract revenues in excess of billings	50,889	26,412
Inventories	48,696	33,426
Prepaid expenses and other current assets	42,932	32,384
Total current assets	326,205	325,778
Property and equipment - net	316,460	310,520
Goodwill and other intangiable assets - net	98,729	98,863
Inventories- noncurrent	23,206	30,103
Investments in joint ventures	6,899	6,923
Other	18,461	16,273
Total	789,960	788,460
LIABILITIES AND EQUITY
Accounts payable	80,652	82,745
Accrued expenses	27,477	31,121
Billings in excess of contract revenues	19,999	13,627
Current portion of long term debt	2,658	3,033
Total current liabilities	130,786	130,526
Long term note payable	2,500	2,500
7 3/8% Senior notes	250,000	250,000
Deferred income taxes	102,920	104,352
Other	8,153	8,545
Total liabilities	494,359	495,923
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	295,373	291,969
NONCONTROLLING INTERESTS	228	568
Total equity	295,601	292,537
TOTAL	789,960	788,460
GLDD Corporation [Member]
ASSETS
Receivables from affiliates	7,685	49,724
Prepaid expenses and other current assets	6,473	16,330
Total current assets	14,158	66,054
investments in subsidiaries	645,270	627,754
Other	6,919	5,547
Total	666,347	699,355
LIABILITIES AND EQUITY
Accounts payable	334
Payables to affiliates	8,180	44,053
Accrued expenses	8,469	8,047
Total current liabilities	16,983	52,100
7 3/8% Senior notes	250,000	250,000
Deferred income taxes	102,994	103,959
Other	769	759
Total liabilities	370,746	406,818
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	295,373	291,969
NONCONTROLLING INTERESTS	228	568
Total equity	295,601	292,537
TOTAL	666,347	699,355
Subsidiary Guarantors [Member]
ASSETS
Cash and cash equivalents	70,623	108,985
Accounts receivable - net	112,289	118,530
Receivables from affiliates	56,184	79,683
Contract revenues in excess of billings	50,932	26,323
Inventories	48,696	33,426
Prepaid expenses and other current assets	36,429	15,929
Total current assets	375,153	382,876
Property and equipment - net	316,408	310,459
Goodwill and other intangiable assets - net	98,369	98,474
Inventories- noncurrent	23,206	30,103
Investments in joint ventures	6,899	6,923
investments in subsidiaries	3,397	4,385
Other	11,539	10,729
Total	834,971	843,949
LIABILITIES AND EQUITY
Accounts payable	79,668	81,971
Payables to affiliates	60,546	85,865
Accrued expenses	18,290	22,445
Billings in excess of contract revenues	19,939	13,607
Current portion of long term debt	2,658	3,033
Total current liabilities	181,101	206,921
Long term note payable	2,500	2,500
Deferred income taxes	(74)	399
Other	7,384	7,786
Total liabilities	190,911	217,606
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	644,060	626,343
Total equity	644,060	626,343
TOTAL	834,971	843,949
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	168	4,303
Accounts receivable - net	608	1,738
Receivables from affiliates	8,344	7,729
Contract revenues in excess of billings	191	153
Prepaid expenses and other current assets	30	125
Total current assets	9,341	14,048
Property and equipment - net	52	61
Goodwill and other intangiable assets - net	360	389
Other	3	3
Total	9,756	14,501
LIABILITIES AND EQUITY
Accounts payable	650	774
Payables to affiliates	3,659	7,234
Accrued expenses	718	629
Billings in excess of contract revenues	122	68
Total current liabilities	5,149	8,705
Total liabilities	5,149	8,705
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	4,607	5,796
Total equity	4,607	5,796
TOTAL	9,756	14,501
Eliminations [Member]
ASSETS
Receivables from affiliates	(72,213)	(137,136)
Contract revenues in excess of billings	(234)	(64)
Total current assets	(72,447)	(137,200)
investments in subsidiaries	(648,667)	(632,139)
Other		(6)
Total	(721,114)	(769,345)
LIABILITIES AND EQUITY
Payables to affiliates	(72,385)	(137,152)
Billings in excess of contract revenues	(62)	(48)
Total current liabilities	(72,447)	(137,200)
Deferred income taxes		(6)
Total liabilities	(72,447)	(137,206)
EQUITY:
Total Great Lakes Dredge & Dock Corporation Equity	(648,667)	(632,139)
Total equity	(648,667)	(632,139)
TOTAL	$ (721,114)	$ (769,345)

Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Contract revenues	$ 166,532	$ 154,959	$ 321,439	$ 310,297
Costs of contract revenues	(142,643)	(135,193)	(277,528)	(263,089)
Gross profit	23,889	19,766	43,911	47,208
General and administrative expenses	11,456	13,622	24,723	25,711
Gain on sale of assets-net	(93)	(2,513)	(124)	(2,771)
Operating income	12,526	8,657	19,312	24,268
Interest expense-net	(5,383)	(4,911)	(10,642)	(10,861)
Equity in loss of joint ventures	(8)	(123)	(24)	(714)
Loss on foreign currency transactions-net	(21)		(15)
Loss on extinguishment of debt				(5,145)
Income before income taxes	7,114	3,623	8,631	7,548
Income tax (provision) benefits	(2,768)	(1,455)	(3,332)	(2,982)
Net income	4,346	2,168	5,299	4,566
Net loss attributable to noncontrolling interests	91	(462)	206	(468)
Net income attributable to Great Lakes Dredge & Dock Corporation	4,437	1,706	5,505	4,098
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	2,667	892	4,213
GLDD Corporation [Member]
General and administrative expenses	615	892	1,127	1,564
Gain on sale of assets-net			11
Operating income	(615)	(892)	(1,138)	(1,564)
Interest expense-net	(5,103)	(4,808)	(10,053)	(10,633)
Equity in earnings (loss) of subsidiaries	12,350	11,567	18,697	28,118
Loss on extinguishment of debt				(5,145)
Income before income taxes	6,632	5,867	7,506	10,776
Income tax (provision) benefits	(2,286)	(3,699)	(2,207)	(6,210)
Net income	4,346	2,168	5,299	4,566
Net loss attributable to noncontrolling interests	91	(462)	206	(468)
Net income attributable to Great Lakes Dredge & Dock Corporation	4,437	1,706	5,505	4,098
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	2,667	892	4,213
Subsidiary Guarantors [Member]
Contract revenues	166,467	151,223	321,911	305,262
Costs of contract revenues	(142,315)	(132,879)	(277,482)	(259,788)
Gross profit	24,152	18,344	44,429	45,474
General and administrative expenses	10,679	12,522	23,248	23,726
Gain on sale of assets-net	(93)	(2,513)	(135)	(2,771)
Operating income	13,566	8,335	21,316	24,519
Interest expense-net	(257)	(49)	(538)	(129)
Equity in earnings (loss) of subsidiaries	(223)	1,160	(602)	1,214
Equity in loss of joint ventures	(8)	(123)	(24)	(714)
Loss on foreign currency transactions-net	(21)		(15)
Income before income taxes	13,057	9,323	20,137	24,890
Income tax (provision) benefits	(482)	2,244	(1,125)	3,228
Net income	12,575	11,567	19,012	28,118
Net income attributable to Great Lakes Dredge & Dock Corporation	12,575	11,567	19,012	28,118
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	10,813	10,753	17,724
Non-Guarantor Subsidiaries [Member]
Contract revenues	2,251	6,269	4,050	9,586
Costs of contract revenues	(2,514)	(4,847)	(4,568)	(7,852)
Gross profit	(263)	1,422	(518)	1,734
General and administrative expenses	162	208	348	421
Operating income	(425)	1,214	(866)	1,313
Interest expense-net	(23)	(54)	(51)	(99)
Income before income taxes	(448)	1,160	(917)	1,214
Net income	(448)	1,160	(917)	1,214
Net income attributable to Great Lakes Dredge & Dock Corporation	(448)	1,160	(917)	1,214
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	(456)	1,160	(921)
Eliminations [Member]
Contract revenues	(2,186)	(2,533)	(4,522)	(4,551)
Costs of contract revenues	2,186	2,533	4,522	4,551
Equity in earnings (loss) of subsidiaries	(12,127)	(12,727)	(18,095)	(29,332)
Income before income taxes	(12,127)	(12,727)	(18,095)	(29,332)
Net income	(12,127)	(12,727)	(18,095)	(29,332)
Net income attributable to Great Lakes Dredge & Dock Corporation	(12,127)	(12,727)	(18,095)	$ (29,332)
Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation	$ (10,357)	$ (11,913)	$ (16,803)

Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 4,346	$ 2,168	$ 5,299	$ 4,566
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization			16,123	18,804
Equity in loss of joint ventures	8	123	24	714
Loss on extinguishment of 7 3/4% senior subordinated notes				5,145
Deferred income taxes			(478)	1,010
Gain on dispositions of property and equipment			(124)	(2,771)
Amortization of deferred financing fees			669	775
Unrealized foreign currency gain			378
Share-based compensation expense			1,714	843
Excess income tax benefit from share based compensation			(118)	(52)
Changes in assets and liabilities:
Accounts receivable			4,301	(13,025)
Inventories			(8,653)	(362)
Prepaid expenses and other current assets			(5,873)	(12,432)
Accounts payable and accrued expenses			(11,771)	(5,523)
Net cash flows used in operating activities			(15,185)	(10,445)
INVESTING ACTIVITIES:
Purchases of property and equipment			(22,428)	(13,583)
Proceeds from dispositions of property and equipment			226	7,275
Net cash flows used in investing activities			(22,202)	(6,308)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes				250,000
Redemption of 7 3/4% senior subordinated notes				(175,000)
Senior subordinated notes redemption premium				(2,264)
Deferred financing fees			(2,039)	(5,829)
Distribution made to member or limited partner, cash distributions paid			(133)
Dividends paid			(2,482)	(2,236)
Dividend equivalents paid on restricted stock units			(22)	(11)
Taxes paid on settlement of vested share awards			(212)	(250)
Repayments of equipment debt			(426)	(217)
Exercise of stock options			75	27
Excess income tax benefit from share-based compensation			118	52
Net cash flows provided by (used in) financing activities			(5,121)	64,272
Effect of foreign currency exchange rates on cash and cash equivalents			11
Net increase (decrease) in cash and cash equivalents			(42,497)	47,519
Cash and cash equivalents at beginning of period			113,288	48,478
Cash and cash equivalents at end of period	70,791	95,997	70,791	95,997
Supplemental Cash Flow Information
Cash paid for interest			9,602	2,728
Cash paid (refunded) for income taxes			(6,371)	5,155
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid			6,231	4,303
Acquisition of noncontrolling interest in NASDI, LLC				40
GLDD Corporation [Member]
OPERATING ACTIVITIES:
Net income	4,346	2,168	5,299	4,566
Adjustments to reconcile net income to net cash flows used in operating activities:
Loss on extinguishment of 7 3/4% senior subordinated notes				5,145
Changes in assets and liabilities:
Net cash flows used in operating activities			(25,028)	(16,679)
FINANCING ACTIVITIES:
Proceeds from issuance of 7 3/8% senior notes				250,000
Redemption of 7 3/4% senior subordinated notes				(175,000)
Senior subordinated notes redemption premium				(2,264)
Deferred financing fees			(2,039)	(5,829)
Distribution made to member or limited partner, cash distributions paid			(133)
Dividends paid			(2,482)	(2,236)
Dividend equivalents paid on restricted stock units			(22)	(11)
Taxes paid on settlement of vested share awards			(212)	(250)
Net change in account with affiliate			(29,723)	47,810
Exercise of stock options			75	27
Excess income tax benefit from share-based compensation			118	52
Net cash flows provided by (used in) financing activities			25,028	16,679
Subsidiary Guarantors [Member]
OPERATING ACTIVITIES:
Net income	12,575	11,567	19,012	28,118
Adjustments to reconcile net income to net cash flows used in operating activities:
Equity in loss of joint ventures	8	123	24	714
Changes in assets and liabilities:
Net cash flows used in operating activities			9,512	3,004
INVESTING ACTIVITIES:
Purchases of property and equipment			(22,428)	(13,583)
Proceeds from dispositions of property and equipment			226	7,275
Net cash flows used in investing activities			(22,202)	(6,308)
FINANCING ACTIVITIES:
Net change in account with affiliate			25,246	(50,703)
Repayments of equipment debt			(426)	(217)
Net cash flows provided by (used in) financing activities			(25,672)	50,486
Net increase (decrease) in cash and cash equivalents			(38,362)	47,182
Cash and cash equivalents at beginning of period			108,985	48,416
Cash and cash equivalents at end of period	70,623	95,598	70,623	95,598
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES:
Net income	(448)	1,160	(917)	1,214
Changes in assets and liabilities:
Net cash flows used in operating activities			331	3,230
FINANCING ACTIVITIES:
Net change in account with affiliate			4,477	2,893
Net cash flows provided by (used in) financing activities			(4,477)	(2,893)
Effect of foreign currency exchange rates on cash and cash equivalents			11
Net increase (decrease) in cash and cash equivalents			(4,135)	337
Cash and cash equivalents at beginning of period			4,303	62
Cash and cash equivalents at end of period	168	399	168	399
Eliminations [Member]
OPERATING ACTIVITIES:
Net income	$ (12,127)	$ (12,727)	$ (18,095)	$ (29,332)