CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (2,488)	$ 1,628	$ (828)	$ (3,458)
Currency translation adjustments, net of income tax	(4,911)	3,875	(9,074)	15,174
Comprehensive (loss) income	$ (7,399)	$ 5,503	$ (9,902)	$ 11,716