UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Comprehensive Income (Loss), Tax [Abstract]
Net (loss) income	$ (15,771)	$ 21,679	$ (31,445)	$ 76,516
Other comprehensive (loss) income, net of tax:
Foreign currency translation (loss) gain	(60)	(229)	(293)	18
Net other comprehensive income (loss), net of ($18), $92, ($88) and $0 tax, respectively	68	(512)	(92)	126
Total other comprehensive income (loss), net of tax	8	(741)	(385)	144
Total comprehensive (loss) income	$ (15,763)	$ 20,938	$ (31,830)	$ 76,660