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Quarterly Financial Data (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
Quarterly Financial Data (Unaudited)                      
Revenues $ 247,763 $ 250,558 $ 260,410 $ 240,228 $ 234,263 $ 210,489 $ 185,310 $ 150,294 $ 998,959 $ 780,356 $ 597,077
Gross profit 32,916 29,572 30,062 26,103 24,625 19,813 19,539 21,589 118,653 85,566 70,720
Net income $ 9,771 $ 8,746 $ 9,535 $ 6,210 $ 5,860 $ 4,221 $ 3,717 $ 4,500 $ 34,262 $ 18,298 $ 16,122
Basic earnings per share (in dollars per share) $ 0.47 $ 0.42 $ 0.46 $ 0.30 $ 0.29 $ 0.21 $ 0.19 $ 0.23 $ 1.67 $ 0.90 $ 0.81
Diluted earnings per share (in dollars per share) $ 0.46 $ 0.41 $ 0.45 $ 0.29 $ 0.28 $ 0.20 $ 0.18 $ 0.21 $ 1.60 $ 0.87 $ 0.78