CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 34,013	$ 62,623
Accounts receivable, net of allowances of $1,078 and $947, respectively	126,911	107,172
Costs and estimated earnings in excess of billings on uncompleted contracts	43,694	29,299
Construction materials inventory	4,003
Deferred income tax assets	13,253	10,544
Receivable for insurance claims in excess of deductibles	10,122	8,422
Refundable income taxes	884	2,144
Other current assets	3,071	3,719
Total current assets	235,951	223,923
Property and equipment, net of accumulated depreciation of $64,345 and $46,878, respectively	117,178	96,591
Goodwill	46,599	46,599
Intangible assets, net of accumulated amortization of $2,223 and $1,888, respectively	10,869	11,204
Other assets	1,971	1,831
Total assets	412,568	380,148
Current liabilities
Short-term borrowings	10,000
Accounts payable	73,924	41,309
Billings in excess of costs and estimated earnings on uncompleted contracts	24,945	45,505
Accrued self insurance	38,850	34,044
Other current liabilities	29,078	17,974
Total current liabilities	176,797	138,832
Long-term debt		30,000
Deferred income tax liabilities	19,354	17,971
Other liabilities	679	636
Total liabilities	196,830	187,439
Commitments and contingencies
Stockholders' equity
Preferred stock-$0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at December 31, 2011 and 2010
Common stock-$0.01 par value per share; 100,000,000 authorized shares; 20,405,044 and 20,007,081 shares issued and outstanding at December 31, 2011 and 2010, respectively	203	200
Additional paid-in capital	149,877	145,149
Retained earnings	65,658	47,360
Total stockholders' equity	215,738	192,709
Total liabilities and stockholders' equity	$ 412,568	$ 380,148