CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 21,281	$ 19,825
Accounts receivable, net of allowances of $1,184 and $1,305, respectively	159,349	167,241
Costs and estimated earnings in excess of billings on uncompleted contracts	43,274	61,773
Deferred income tax assets	12,742	12,742
Receivable for insurance claims in excess of deductibles	11,341	11,379
Refundable income taxes		1,044
Other current assets	5,097	4,396
Total current assets	253,084	278,400
Property and equipment, net of accumulated depreciation of $94,680 and $88,042, respectively	134,885	128,911
Goodwill	46,599	46,599
Intangible assets, net of accumulated amortization of $2,642 and $2,558, respectively	10,450	10,534
Other assets	1,874	1,904
Total assets	446,892	466,348
Current liabilities:
Accounts payable	61,230	84,481
Billings in excess of costs and estimated earnings on uncompleted contracts	32,240	32,589
Accrued self insurance	39,545	39,583
Accrued income taxes	1,419
Other current liabilities	26,018	32,240
Total current liabilities	160,452	188,893
Deferred income tax liabilities	21,530	21,530
Other liabilities	1,267	1,235
Total liabilities	183,249	211,658
Commitments and contingencies
Stockholders' equity:
Preferred stock-$0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at March 31, 2013 and December 31, 2012
Common stock-$0.01 par value per share; 100,000,000 authorized shares; 20,981,098 and 20,747,161 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	208	206
Additional paid-in capital	156,555	154,564
Retained earnings	106,880	99,920
Total stockholders' equity	263,643	254,690
Total liabilities and stockholders' equity	$ 446,892	$ 466,348