Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
COMPREHENSIVE INCOME:
Net income	$ 109,315	$ 80,316	$ 205,482	$ 158,837
Foreign currency translation adjustments, net of tax	(15,424)	10,132	(9,916)	14,996
Total comprehensive income	$ 93,891	$ 90,448	$ 195,566	$ 173,833