CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities:
Net income (loss)	$ (1,804)	$ 13,093	$ 20,804
Depreciation	20,692	19,282	18,512
Asset impairments	7,690
Deferred income taxes	(860)	3,364	5,137
Excess tax benefits from share-based payment arrangement	(146)	(124)	(24)
Compensation expense-stock compensation plans	906	825	677
Changes in operating assets and liabilities:
Contracts receivable, net	(60,057)	75,826	8,146
Contract retainage	6,687	(10,125)	(263)
Costs and estimated earnings in excess of billings on uncompleted contracts	(6,469)	11,460	(7,834)
Prepaid expenses and other assets	(9,401)	(691)	(322)
Inventory	(2,013)	(41)	1,464
Other receivables		(53)	1,640
Accounts payable	15,240	(11,256)	(547)
Billings in excess of costs and estimated earnings on uncompleted contracts	42,148	(1,720)	(30,996)
Accrued employee costs	(1,317)	(404)	(1,284)
Accrued expenses	1,082	(531)	(2,370)
Current income taxes	(446)	(2,755)	(1,752)
Net cash provided by operating activities	11,932	96,150	10,988
Cash flows from investing activities:
Capital expenditures, net	(41,545)	(16,475)	(15,250)
Proceeds from the sale of equipment			1,000
Net cash used in investing activities	(41,545)	(16,475)	(14,250)
Cash flows from financing activities:
Proceeds from exercise of stock options	167	101	21
Excess tax benefit from share-based payment arrangements	146	124	24
Payments of dividends on common stock	(3,485)	(579)	(1,871)
Net cash used in financing activities	(3,172)	(354)	(1,826)
Net increase (decrease) in cash and cash equivalents	(32,785)	79,321	(5,088)
Cash and cash equivalents at beginning of period	88,072	8,751	13,839
Cash and cash equivalents at end of period	55,287	88,072	8,751
Supplemental cash flow information:
Interest paid	132	72	71
Income taxes paid, net of refunds	$ 660	$ 7,644	$ 7,893