Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 20,232	$ 18,015	$ 57,604	$ 47,011
Other comprehensive income (loss):
Foreign currency translation adjustments	(10,129)	(4,546)	(14,163)
Total other comprehensive income (loss)	(10,129)	(4,546)	(14,163)	(1,947)
Comprehensive income	$ 10,103	$ 13,469	$ 43,441	$ 45,064