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 Income And Comprehensive Income [Abstract]
Net Income	$ 15,384	$ 9,349	$ 25,710	$ 18,159
Other Comprehensive income:
Foreign currency translation adjustment	10,275	(4,951)	13,827	(762)
Change in fair value of derivative financial instruments, net of tax	(161)	0	657	0
Other comprehensive loss	10,114	(4,951)	14,484	(762)
Comprehensive income	$ 25,498	$ 4,398	$ 40,194	$ 17,397