Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019		Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 261,651	$ 176,852	[1]	$ 433,758	[2]	$ 351,789	[1]
Other comprehensive income (loss):
Foreign currency translation gains (losses), net of tax	31,662	(362,085)		32,035		(318,831)
Net change in derivative contracts, net of tax	(25,667)			(46,374)
Net change in derivative contracts, net of tax		0				0
Total other comprehensive income (loss)	5,995	(362,085)		(14,339)		(318,831)
Total comprehensive income (loss)	$ 267,646	$ (185,233)		$ 419,419		$ 32,958

[1] Reflects reclassifications from previously disclosed amounts to conform to current presentation.

[2] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using the modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 2.