Condensed Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 47,224	$ 40,137	$ 94,560	$ 83,282
Other comprehensive (loss) income:
Net foreign currency translation adjustment	(1,900)	2,066	(789)	2,415
Total comprehensive income	$ 45,324	$ 42,203	$ 93,771	$ 85,697