Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 38,129	$ 38,523	$ 55,653
Other comprehensive income:
Foreign currency adjustments			4,904
Total other comprehensive income			4,904
Comprehensive income	$ 38,129	$ 38,523	$ 60,557