Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net (loss)/income	$ (1,678)	$ 11,790
Depreciation and amortization	11,140	9,136
Deferred financing cost amortization	65	209
Bad debt expense	0	(77)
Deferred income taxes	2,593	(64)
Stock-based compensation	1,122	1,396
Gain on sale of property and equipment	(148)	(143)
Gain on bargain purchase from acquisition of business	0	(2,176)
Excess tax benefit from stock option exercise	0	(59)
Change in operating assets and liabilities, excluding effects of businesses acquired:
Accounts receivable	12,679	(7,311)
Income tax receivable	(292)	(2,027)
Inventory	(1,111)	11
Note receivable	39	1,040
Prepaid expenses and other	328	(485)
Accounts payable	(10,651)	(9,015)
Accrued liabilities	(1,569)	941
Income tax payable	(262)	(282)
Billings in excess of costs and estimated earnings on uncompleted contracts, net	1,444	(5,518)
Deferred revenue	(29)	(27)
Net cash provided by (used in) operating activities	13,670	(2,661)
Cash flows from investing activities:
Proceeds from sale of property and equipment	371	228
Purchase of property and equipment	(9,691)	(16,079)
Acquisition of business in Pacific Northwest	0	(6,653)
Acquisition of TW LaQuay Dredging (net of cash acquired)	0	(64,000)
Net cash used in investing activities	(9,320)	(86,504)
Cash flows from financing activities:
Exercise of stock options	182	528
Excess tax benefit from stock option exercise	0	59
Increase in loan costs	0	(360)
Purchases of shares into treasury	(3,003)	0
Net cash (used in) provided by financing activities	(2,821)	227
Net change in cash and cash equivalents	1,529	(88,938)
Cash and cash equivalents at beginning of period	23,174	104,736
Cash and cash equivalents at end of period	24,703	15,798
Supplemental disclosures of cash flow information:
Interest	103	16
Taxes (net of refunds)	$ (3,278)	$ 9,181