Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 196,029	$ 176,643	$ 109,712	$ 206,884	$ 227,511	$ 217,405	$ 228,080	$ 237,182	$ 689,268	$ 910,178	$ 780,931
Gross Profit	67,383	66,784	30,122	84,427	95,668	89,720	94,855	102,571	248,716	382,814	353,087
Net (loss) income	$ (1,561)	$ 10,018	$ (134,779)	$ 22,328	$ 27,396	$ 23,917	$ 21,390	$ 31,643	$ (103,994)	$ 104,346	$ 80,354
Basic (in dollars per share)	$ (0.10)	$ 0.60	$ (8.33)	$ 1.33	$ 1.61	$ 1.38	$ 1.20	$ 1.76	$ (6.43)	$ 5.95	$ 4.43
Diluted (in dollars per share)	$ (0.10)	$ 0.60	$ (8.33)	$ 1.31	$ 1.59	$ 1.36	$ 1.18	$ 1.73	$ (6.43)	$ 5.85	$ 4.37
Asset impairment charges			$ 123,700