Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
COMPREHENSIVE INCOME:
Net income	$ 343,389	$ 357,796	$ 305,928
Foreign currency translation adjustments, net of tax	(10,208)	(25,024)	(23,341)
Total comprehensive income	$ 333,181	$ 332,772	$ 282,587