Consolidated Statements 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]
Net income	$ 130,987	$ 116,253	[1]	$ 254,680	$ 227,343	[1],[2]
Other comprehensive (loss) income:
Foreign currency translation (losses) gains, net of tax	(37,260)	(20,132)		56,354	11,070
Total other comprehensive (loss) income	(37,260)	(20,132)		56,354	11,070
Total comprehensive income	$ 93,727	$ 96,121		$ 311,034	$ 238,413

[1] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to simplify several aspects of the accounting for share-based compensation, including the income tax consequences.

[2] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to simplify several aspects of the accounting for share-based compensation, including the income tax consequences.