CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (18,402)	$ 2,607	$ (31,278)	$ (9,422)
Other comprehensive income (loss):
Unrealized gain on hedging activity, net of tax of $238 and $832	843	0	2,970	0
Foreign currency translation adjustments	(16,064)	(8,415)	(13,035)	(10,285)
Comprehensive loss	$ (33,623)	$ (5,808)	$ (41,343)	$ (19,707)