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Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of quarterly financial information                      
Revenue $ 113,662 $ 111,069 $ 95,500 $ 82,422 $ 84,708 $ 85,384 $ 76,013 $ 68,769 $ 402,652 $ 314,874 $ 273,123
Cost of revenues 91,410 89,505 79,159 75,865 86,288 69,231 62,732 63,171 335,938 271,422 228,383
Net income $ 5,789 $ 5,812 $ 3,743 $ (2,213) $ (96) $ 5,414 $ 3,449 $ 5,546 $ 13,131 $ 14,318 $ 7,353
Basic (loss) earnings per share $ 0.83 $ 0.83 $ 0.54 $ (0.22) $ (0.01) $ 0.54 $ 0.34 $ 0.54 $ 1.70 $ 1.42 $ 0.71
Diluted (loss) earnings per share $ 0.80 $ 0.81 $ 0.53 $ (0.22) $ (0.01) $ 0.54 $ 0.34 $ 0.54 $ 1.67 $ 1.41 $ 0.71
Common Stock Market Prices [Abstract]                      
High $ 39.49 $ 28.96 $ 21.45 $ 21.10 $ 20.00 $ 15.77 $ 16.83 $ 16.22      
Low $ 26.19 $ 19.99 $ 18.88 $ 15.68 $ 13.49 $ 12.25 $ 13.76 $ 13.50