Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 162,257	$ 176,244	$ 178,057	$ 165,871	$ 153,386	$ 165,625	$ 190,944	$ 184,063	$ 682,429	$ 694,018	$ 841,045
Gross Profit	59,807	71,402	67,984	53,513	25,247	57,262	81,279	82,228	252,706	246,016	432,206
Operating (Loss) Income	(43,980)	8,768	(87,366)	(65,483)	(195,865)	(75,980)	(91,166)	(25,415)	(188,061)	(388,426)	(22,884)
Net (Loss) Income, Amount	$ (80,660)	$ 47,670	$ (111,599)	$ (82,181)	$ (215,038)	$ (70,140)	$ (87,984)	$ (28,747)	$ (226,770)	$ (401,909)	$ (24,550)
Net (Loss) Income, Per Basic Share (in dollars per share)	$ (0.64)	$ 0.38	$ (0.89)	$ (0.65)	$ (1.71)	$ (0.56)	$ (0.70)	$ (0.23)
Net (Loss) Income, Per Diluted Share (in dollars per share)	$ (0.64)	$ 0.38	$ (0.89)	$ (0.65)	$ (1.71)	$ (0.56)	$ (0.70)	$ (0.23)