Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 158,488	$ 261,651	$ 305,548	$ 433,758
Other comprehensive income (loss):
Foreign currency translation gains (losses), net of tax	8,257	31,662	(566,861)	32,035
Net change in derivative contracts, net of tax	1,892	(25,667)	(42,649)	(46,374)
Total other comprehensive income (loss)	10,149	5,995	(609,510)	(14,339)
Total comprehensive income (loss)	$ 168,637	$ 267,646	$ (303,962)	$ 419,419