CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 6,210	$ 4,500
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities -
Depreciation and amortization of property and equipment	5,700	4,247
Amortization of intangible assets	84	84
Stock-based compensation expense	694	348
Gain on sale of property and equipment	(127)	(71)
Other non-cash items	34	44
Changes in operating assets and liabilities
Accounts receivable, net	(28,418)	15,316
Costs and estimated earnings in excess of billings on uncompleted contracts	(10,179)	(6,111)
Construction materials inventory	2,461
Receivable for insurance claims in excess of deductibles	180	37
Other assets	590	3,241
Accounts payable	6,177	(5,856)
Billings in excess of costs and estimated earnings on uncompleted contracts	3,805	(2,680)
Accrued self insurance	(647)	89
Other liabilities	1,428	606
Net cash flows provided by (used in) operating activities	(12,008)	13,794
Cash flows from investing activities:
Proceeds from sale of property and equipment	140	71
Purchases of property and equipment	(8,330)	(12,223)
Net cash flows used in investing activities	(8,190)	(12,152)
Cash flows from financing activities:
Repayments on term loan		(20,000)
Net repayments on revolving credit facility	(10,000)
Debt issuance costs	(11)
Employee stock option transactions	34	359
Excess tax benefit from stock-based awards	20	169
Restricted stock tax withholdings	(108)	(80)
Net cash flows used in financing activities	(10,065)	(19,552)
Net decrease in cash and cash equivalents	(30,263)	(17,910)
Cash and cash equivalents:
Beginning of period	34,013	62,623
End of period	$ 3,750	$ 44,713