Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 79,533	$ 63,558	$ 59,274
Other comprehensive income (loss):
Foreign currency translation adjustments	(12,129)	(5,855)	(5,376)
Total other comprehensive income (loss)	(12,129)	(5,855)	(5,376)
Comprehensive income	$ 67,404	$ 57,703	$ 53,898