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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS      
Contract revenues $ 998,959 $ 780,356 $ 597,077
Contract costs 880,306 694,790 526,357
Gross profit 118,653 85,566 70,720
Selling, general and administrative expenses 63,575 56,776 44,630
Amortization of intangible assets 335 335 335
Gain on sale of property and equipment (1,019) (1,174) (750)
Income from operations 55,762 29,629 26,505
Other income (expense):      
Interest income 2 53 58
Interest expense (852) (544) (1,054)
Other, net (222) (81) (144)
Income before provision for income taxes 54,690 29,057 25,365
Income tax expense 20,428 10,759 9,243
Net income $ 34,262 $ 18,298 $ 16,122
Income per common share:      
-Basic (in dollars per share) $ 1.67 $ 0.90 $ 0.81
-Diluted (in dollars per share) $ 1.60 $ 0.87 $ 0.78
Weighted average number of common shares and potential common shares outstanding:      
-Basic (in shares) 20,391 20,151 19,883
-Diluted (in shares) 21,172 20,993 20,782