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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
 [1]
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Quarterly Financial Information [Line Items]                      
Revenues $ 373,501 $ 373,502 $ 356,185 $ 300,129 $ 343,660 $ 283,259 $ 261,934 $ 253,634 $ 1,403,317 $ 1,142,487 $ 1,061,681
Gross profit 36,894 34,853 27,517 25,740 41,944 34,063 31,435 27,281 125,004 134,723 122,341
Net income $ 13,579 $ 5,145 $ 1,230 $ 1,200 $ 7,798 $ 6,146 $ 5,500 $ 1,987 $ 21,154 $ 21,431 $ 27,302
Basic earnings per share (in dollars per share) $ 0.83 $ 0.32 $ 0.08 $ 0.07 $ 0.49 $ 0.39 $ 0.32 $ 0.10 $ 1.30 $ 1.25 $ 1.33
Diluted earnings per share (in dollars per share) $ 0.82 $ 0.31 $ 0.07 $ 0.07 $ 0.48 $ 0.38 $ 0.31 $ 0.10 $ 1.28 $ 1.23 $ 1.30
[1] Results for the fourth quarter of 2017 include a net Tax Act benefit of $7.8 million, or $0.48 and $0.47 per basic and diluted share, respectively. See further discussion in Note 10 — Income Taxes to our Financial Statements.