CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (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 income (loss)	$ 6,372	$ 189	$ 10,292	$ (2,832)
Change in cumulative foreign currency translation adjustment	(4,356)	4,960	(2,751)	6,778
Total comprehensive income	$ 2,016	$ 5,149	$ 7,541	$ 3,946