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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 4,221	$ 3,901	$ 12,438	$ 10,034
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities -
Depreciation and amortization of property and equipment	4,980	3,969	13,794	11,718
Amortization of intangible assets	84	84	251	251
Stock-based compensation expense	146	394	1,100	1,210
Excess tax benefit from stock-based awards	(1,228)	(1)	(1,672)	(149)
Deferred income taxes	(622)	(812)	(576)	(812)
Gain on sale of property and equipment	(428)	(278)	(728)	(724)
Other non-cash items	17	22	78	64
Changes in operating assets and liabilities
Accounts receivable, net	(37,261)	(5,700)	(29,831)	2,822
Costs and estimated earnings in excess of billings on uncompleted contracts	4,233	(8,258)	(20,947)	(7,330)
Construction materials inventory	(2,754)		(2,754)
Receivable for insurance claims in excess of deductibles	35	49	(714)	(264)
Other assets	2,656	1,341	4,223	3,246
Accounts payable	4,972	1,272	21,389	(4,213)
Billings in excess of costs and estimated earnings on uncompleted contracts	(3,014)	2,636	(6,566)	749
Accrued self insurance	2,797	(237)	3,799	734
Other liabilities	2,195	504	1,987	(5,047)
Net cash flows provided by (used in) operating activities	(18,971)	(1,114)	(4,729)	12,289
Cash flows from investing activities:
Proceeds from sale of property and equipment	508	280	808	751
Purchases of property and equipment	(11,338)	(4,950)	(34,162)	(12,082)
Net cash flows used in investing activities	(10,830)	(4,670)	(33,354)	(11,331)
Cash flows from financing activities:
Proceeds from borrowings	10,000		10,000
Payments on term loan			(20,000)
Payments of capital lease obligations		(6)		(38)
Employee stock option transactions	711	30	1,370	536
Excess tax benefit from stock-based awards	1,228	1	1,672	149
Purchase of treasury stock			(80)
Other financing activities			45
Net cash flows provided by (used in) financing activities	11,939	25	(6,993)	647
Net increase (decrease) in cash and cash equivalents	(17,862)	(5,759)	(45,076)	1,605
Cash and cash equivalents:
Beginning of period	35,409	44,940	62,623	37,576
End of period	$ 17,547	$ 39,181	$ 17,547	$ 39,181

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration