Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 79,900	$ 51,450	$ 167,767	$ 65,050
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment (CTA) gain (loss)	100,909	(32,603)	408,830	(215,065)
Net investment hedge CTA gain (loss)	(60,723)	(34,721)	(191,121)	4,163
Unrealized gain (loss) on available-for-sale securities, net of tax effects of $(108), $(693), $(178) and $(1,113)	245	1,487	(85)	2,382
Unrealized gain (loss) on cash flow hedges, net of tax effects of $4,379, $1,384, $17,670 and $(1,263)	(13,070)	(4,153)	(52,468)	3,789
Net actuarial gain on defined benefit plans, net of tax effects of $(4), $(3), $(14) and $(9)	13	7	39	21
Total other comprehensive income (loss), net of tax	27,374	(69,983)	165,195	(204,710)
Comprehensive income (loss), net of tax	$ 107,274	$ (18,533)	$ 332,962	$ (139,660)