Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 365,359	$ 232,982	$ 126,800
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment (CTA) gain (loss), net of tax effects of $4,419, $0 and $0	(421,743)	454,269	(507,420)
Net investment hedge CTA gain (loss), net of tax effects of $1,358, $0 and $0	219,628	(235,292)	45,505
Unrealized gain on available-for-sale securities, net of tax effects of $0, $(10) and $(784)	0	14	2,249
Unrealized gain (loss) on cash flow hedges, net of tax effects of $(14,557), $18,542 and $(6,760)	43,671	(54,895)	19,551
Net actuarial gain (loss) on defined benefit plans, net of tax effects of $(15), $39 and $(8)	55	(143)	32
Total other comprehensive income (loss), net of tax	(158,389)	163,953	(440,083)
Comprehensive income (loss), net of tax	$ 206,970	$ 396,935	$ (313,283)