Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 28,214	$ 26,201	$ 51,335	$ 42,544
Other comprehensive income (loss):
Translation adjustment, net of tax expense (benefit)	10,628	(4,478)	13,949	5,011
Comprehensive income	$ 38,842	$ 21,723	$ 65,284	$ 47,555