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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Quarterly Financial Information [Line Items]                      
Revenues $ 343,660 $ 283,259 $ 261,934 $ 253,634 $ 271,184 $ 269,861 $ 276,488 $ 244,148 $ 1,142,487 $ 1,061,681 $ 943,967
Gross profit 41,944 34,063 31,435 27,281 32,611 28,620 31,736 29,374 134,723 122,341 132,414
Net income $ 7,798 $ 6,146 $ 5,500 $ 1,987 $ 5,881 $ 6,175 $ 8,074 $ 7,172 $ 21,431 $ 27,302 $ 36,544
Basic earnings per share (in dollars per share) $ 0.49 $ 0.39 $ 0.32 $ 0.10 $ 0.29 $ 0.30 $ 0.39 $ 0.35 $ 1.25 $ 1.33 $ 1.73
Diluted earnings per share (in dollars per share) $ 0.48 $ 0.38 $ 0.31 $ 0.10 $ 0.29 $ 0.29 $ 0.38 $ 0.34 $ 1.23 $ 1.3 $ 1.69