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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Contract revenues $ 780,356 $ 597,077 $ 631,168
Contract costs 694,790 526,357 555,261
Gross profit 85,566 70,720 75,907
Selling, general and administrative expenses 56,776 44,630 48,467
Amortization of intangible assets 335 335 335
Gain on sale of property and equipment (1,174) (750) (418)
Income from operations 29,629 26,505 27,523
Other income (expense):      
Interest income 53 58 218
Interest expense (544) (1,054) (852)
Other, net (81) (144) (208)
Income before provision for income taxes 29,057 25,365 26,681
Income tax expense 10,759 9,243 9,446
Net income $ 18,298 $ 16,122 $ 17,235
Income per common share:      
-Basic (in dollars per share) $ 0.90 $ 0.81 $ 0.87
-Diluted (in dollars per share) $ 0.87 $ 0.78 $ 0.83
Weighted average number of common shares and potential common shares outstanding:      
-Basic (in shares) 20,151 19,883 19,755
-Diluted (in shares) 20,993 20,782 20,702