Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 172,107	[1]	$ 174,937
Other comprehensive (loss) income:
Foreign currency translation gains, net of tax	373		43,254
Net change in derivative contracts, net of tax	(20,707)		0
Total other comprehensive (loss) income	(20,334)		43,254
Total comprehensive income	$ 151,773		$ 218,191

[1] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, "Statement of Cash Flows (Topic 230)", which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the statement of cash flows.