Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 20,247	$ 18,789	$ 27,098
Foreign currency translation adjustments	(8,661)	(5,404)	(5,783)
Comprehensive income	$ 11,586	$ 13,385	$ 21,315