CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 3,717	$ 3,353	$ 8,217	$ 6,133
Adjustments to reconcile net income to net cash flows provided by operating activities -
Depreciation and amortization of property and equipment	4,567	3,809	8,814	7,749
Amortization of intangible assets	83	83	167	167
Stock-based compensation expense	606	392	954	816
Excess tax benefit from stock-based awards	(275)	(132)	(444)	(148)
Deferred income taxes	46		46
Gain on sale of property and equipment	(229)	(256)	(300)	(446)
Other non-cash items	17	21	61	42
Changes in operating assets and liabilities
Accounts receivable, net	(7,886)	(5,779)	7,430	8,522
Costs and estimated earnings in excess of billings on uncompleted contracts	(19,069)	2,081	(25,180)	928
Receivable for insurance claims in excess of deductibles	(786)	57	(749)	(313)
Other assets	(1,674)	1,364	1,567	1,905
Accounts payable	22,273	4,059	16,417	(5,485)
Billings in excess of costs and estimated earnings on uncompleted contracts	(872)	5,102	(3,552)	(1,887)
Accrued self insurance	913	676	1,002	971
Other liabilities	(983)	(2,060)	(208)	(5,551)
Net cash flows provided by operating activities	448	12,770	14,242	13,403
Cash flows from investing activities:
Proceeds from sale of property and equipment	229	281	300	471
Purchases of property and equipment	(10,601)	(5,750)	(22,824)	(7,132)
Net cash flows used in investing activities	(10,372)	(5,469)	(22,524)	(6,661)
Cash flows from financing activities:
Payments on term loan			(20,000)
Payments of capital lease obligations		(16)		(32)
Employee stock option transactions	300	403	659	506
Excess tax benefit from stock-based awards	275	132	444	148
Purchase of Treasury stock			(80)
Other financing activities	45		45
Net cash flows provided by (used in) financing activities	620	519	(18,932)	622
Net increase (decrease) in cash and cash equivalents	(9,304)	7,820	(27,214)	7,364
Cash and cash equivalents:
Beginning of period	44,713	37,120	62,623	37,576
End of period	$ 35,409	$ 44,940	$ 35,409	$ 44,940