Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 124,825	$ 79,900	$ 255,337	$ 167,767
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment (CTA) gain (loss), net of tax effect of $(942), $0, $5,043 and $0	(77,566)	100,909	(352,948)	408,830
Net investment hedge CTA gain (loss), net of tax effect of $0, $0, $1,637 and $0	27,214	(60,723)	180,694	(191,121)
Unrealized gain (loss) on available-for-sale securities, net of tax effect of $0, $(108), $0 and $(178)	0	245	0	(85)
Unrealized gain (loss) on cash flow hedges, net of tax effects of $(2,061), $4,379, $(12,459) and $17,670	6,184	(13,070)	37,384	(52,468)
Net actuarial gain on defined benefit plans, net of tax effects of $(4), $(4), $(14) and $(14)	14	13	35	39
Total other comprehensive income (loss), net of tax	(44,154)	27,374	(134,835)	165,195
Comprehensive income, net of tax	$ 80,671	$ 107,274	$ 120,502	$ 332,962