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Unaudited Quarterly Consolidated Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 215,989	$ 261,064	$ 328,004	$ 283,148	$ 199,112	$ 243,273	$ 313,221	$ 267,907	$ 1,088,205	$ 1,023,513	$ 1,036,273
Gross profit	99,822	139,059	181,400	139,873	90,367	123,463	169,807	133,584	560,154	517,221	500,164
Income (loss) from operations	(13,937)	13,895	37,064	25,922	(30,377)	2,685	29,446	15,582	62,944	17,336	(6,154)
Net income (loss)	(10,886)	10,492	34,377	16,454	(24,361)	1,629	21,960	11,010	50,437	10,238	(16,494)
Net income (loss) attributable to common shareholders (2)	$ (118,685)	$ 6,520	$ 30,426	$ 12,523	$ (28,272)	$ (2,263)	$ 18,086	$ 7,155	$ (69,216)	$ (5,294)	$ (31,738)
Basic income (in dollars per share)	$ (1.72)	$ 0.08	$ 0.37	$ 0.15	$ (0.41)	$ (0.03)	$ 0.21	$ 0.08	$ (1.01)	$ (0.07)	$ (0.43)
Diluted income (in dollars per share)	$ (1.72)	$ 0.07	$ 0.35	$ 0.15	$ (0.41)	$ (0.03)	$ 0.20	$ 0.08	$ (1.01)	$ (0.07)	$ (0.43)

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