Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 22,510	$ 20,558	$ 77,640	$ 70,009
Other comprehensive (loss) income:
Foreign currency translation adjustments	(7,054)	(8,065)	(31,894)	(9,337)
Total other comprehensive loss	(7,054)	(8,065)	(31,894)	(9,337)
Comprehensive income	$ 15,456	$ 12,493	$ 45,746	$ 60,672