Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 67,618	$ 45,805	$ 130,512	$ 87,867
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment (CTA) gain (loss), net of tax effect of $5,985, $0, $5,985 and $0	(421,233)	200,983	(275,382)	307,921
Net investment hedge CTA gain (loss), net of tax effect of $0, $0, $1,637 and $0	226,115	(101,847)	153,480	(130,398)
Unrealized loss on available-for-sale securities, net of tax effect of $0, $29, $0 and $(70)	0	(65)	0	(330)
Unrealized gain (loss) on cash flow hedges, net of tax effects of $(11,758), $9,240, $(10,398) and $13,291	35,280	(27,671)	31,200	(39,398)
Net actuarial gain on defined benefit plans, net of tax effects of $(4), $(4), $(10) and $(10)	13	15	21	26
Total other comprehensive income (loss), net of tax	(159,825)	71,415	(90,681)	137,821
Comprehensive income (loss), net of tax	$ (92,207)	$ 117,220	$ 39,831	$ 225,688