Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 44,361	$ 28,197	$ 113,876	$ 79,532
Other comprehensive income:
Translation adjustment	(2,950)	5,543	(10,533)	19,492
Comprehensive income	$ 41,411	$ 33,740	$ 103,343	$ 99,024