Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 22,943	$ 20,518	$ 17,610
Other comprehensive income (loss):
Cumulative translation adjustment	991	369	(2,222)
Other comprehensive income (loss)	991	369	(2,222)
Comprehensive Income	$ 23,934	$ 20,887	$ 15,388