Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
COMPREHENSIVE INCOME:
Net income	$ 115,242	$ 84,700	$ 320,724	$ 243,537
Foreign currency translation adjustments, net of tax	(3,383)	7,210	(13,299)	22,206
Total comprehensive income	$ 111,859	$ 91,910	$ 307,425	$ 265,743