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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data (Unaudited)                      
Revenues $ 254,581 $ 232,890 $ 213,916 $ 201,342 $ 247,763 $ 250,558 $ 260,410 $ 240,228 $ 902,729 $ 998,959 $ 780,356
Gross profit 33,838 32,483 31,253 27,303 32,916 29,572 30,062 26,103 124,877 118,653 85,566
Net income $ 10,022 $ 8,315 $ 9,462 $ 6,960 $ 9,771 $ 8,746 $ 9,535 $ 6,210 $ 34,759 $ 34,262 $ 18,298
Basic earnings per share (in dollars per share) $ 0.47 $ 0.39 $ 0.45 $ 0.33 $ 0.47 $ 0.42 $ 0.46 $ 0.30 $ 1.65 $ 1.67 $ 0.90
Diluted earnings per share (in dollars per share) $ 0.46 $ 0.38 $ 0.44 $ 0.32 $ 0.46 $ 0.41 $ 0.45 $ 0.29 $ 1.61 $ 1.60 $ 0.87