Income Taxes - Provision (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
(Loss) before income taxes	$ (18,587)	$ (88,539)	$ (209,465)	$ (228,822)
Income tax (benefit)	(66,257)	(18,399)	(63,355)	(41,951)
NET INCOME/(LOSS)	$ 47,670	$ (70,140)	$ (146,110)	$ (186,871)
Income tax (benefit) as a percentage of (loss) before income taxes		20.80%	30.20%	18.30%