CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 15,239	$ 11,673	$ 47,884	$ 24,847
Other comprehensive income (loss):
Currency translation adjustment	13,337	(14,214)	36,342	(16,703)
Comprehensive income (loss)	$ 28,576	$ (2,541)	$ 84,226	$ 8,144