Condensed Consolidated Statement 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]
Consolidated net income	$ 40,137	$ 37,569	$ 83,282	$ 73,528
Other comprehensive income (loss):
Net foreign currency translation adjustment	2,066	(759)	2,415	(759)
Total comprehensive income	$ 42,203	$ 36,810	$ 85,697	$ 72,769