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Unaudited Quarterly Consolidated Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 199,112 $ 243,273 $ 313,221 $ 267,907 $ 187,417 $ 245,888 $ 323,828 $ 279,140 $ 1,023,513 $ 1,036,273 $ 1,090,630
Gross profit 90,367 123,463 169,807 133,584 78,724 122,434 169,640 129,366 517,221 500,164 510,805
Income (loss) from operations (30,377) 2,685 29,446 15,582 (39,787) (1,215) 20,605 14,243 17,336 (6,154) (72,324)
Net income (loss) (24,361) 1,629 21,960 11,010 (40,644) (1,533) 15,537 10,146 10,238 (16,494) (83,196)
Net income (loss) attributable to common shareholders $ (28,272) $ (2,263) $ 18,086 $ 7,155 $ (44,482) $ (5,352) $ 11,735 $ 6,361 $ (5,294) $ (31,738) $ (98,007)
Basic income (in dollars per share) $ (0.41) $ (0.03) $ 0.21 $ 0.08 $ (0.60) $ (0.07) $ 0.13 $ 0.07 $ (0.07) $ (0.43) $ (1.30)
Diluted income (in dollars per share) $ (0.41) $ (0.03) $ 0.20 $ 0.08 $ (0.60) $ (0.07) $ 0.13 $ 0.07 $ (0.07) $ (0.43) $ (1.30)