Selected Quarterly Financial Data (Unaudited) - (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]
Net revenue	$ 114,255	$ 164,112	$ 140,663	$ 88,404	$ 118,650	$ 165,756	$ 137,157	$ 94,432	$ 507,434	$ 515,995	$ 441,222
Operating income (loss)	(42,849)	32,980	17,561	3,447	14,768	38,938	17,783	5,792	11,139	77,281	84,730
Net income (loss) from continuing operations	(26,271)	14,495	5,743	(2,843)	3,120	15,863	5,602	(1,383)	(8,875)	23,202	10,246
Net income (loss) from discontinued operations, net of income taxes	(850)	(202)	(181)	(165)	91	0	0	0	(1,398)	91	0
Net income (loss)	$ (27,121)	$ 14,293	$ 5,563	$ (3,008)	$ 3,211	$ 15,863	$ 5,602	$ (1,383)	$ (10,273)	$ 23,293	$ 10,246
Earnings Per Share, Basic [Abstract]
Continuing operations (in usd per share)	$ (1.42)	$ 0.78	$ 0.31	$ (0.15)	$ 0.17	$ 0.86	$ 0.31	$ (0.08)	$ (0.48)	$ 1.28	$ 0.58
Discontinued operations (in dollars per share)	(0.05)	(0.01)	(0.01)	(0.01)	0.00	0.00	0.00	0.00	(0.08)	0	0
Basic (in dollars per share)	(1.47)	0.77	0.30	(0.16)	0.17	0.86	0.31	(0.08)	(0.56)	1.28	0.58
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	(1.42)	0.51	0.20	(0.15)	0.12	0.58	0.20	(0.08)	(0.48)	0.85	0.37
Discontinued operations (in dollars per share)	(0.05)	0.00	0.00	(0.01)	0.00	0.00	0.00	0.00	(0.08)	0	0
Diluted (in dollars per share)	$ (1.47)	$ 0.51	$ 0.20	$ (0.16)	$ 0.12	$ 0.58	$ 0.20	$ (0.08)	$ (0.56)	$ 0.85	$ 0.37