Income Taxes - Provision (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
(Loss) before income taxes	$ (80,761)	$ (36,027)
Income tax provision (benefit)	1,420	(7,280)
NET (LOSS)	$ (82,181)	$ (28,747)
Income tax provision (benefit) as a percentage of (loss) before income taxes	(1.80%)	20.20%