Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 45,805	$ 44,711	$ 87,867	$ 13,600
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment (CTA) gain (loss)	200,983	(298,361)	307,921	(182,462)
Unrealized gain (loss) on available-for-sale securities, net of tax effects of $29, $(558), $(70) and $(420)	(65)	1,199	(330)	895
Unrealized gain (loss) on cash flow hedges, net of tax effects of $9,240, $(4,908), $13,291 and $(2,647)	(27,671)	14,726	(39,398)	7,942
Net investment hedge CTA gain (loss)	(101,847)	55,196	(130,398)	38,884
Net actuarial gain on defined benefit plans, net of tax effects of $(4), $(2), $(10) and $(6)	15	8	26	14
Total other comprehensive income (loss), net of tax	71,415	(227,232)	137,821	(134,727)
Comprehensive income (loss), net of tax	117,220	(182,521)	225,688	(121,127)
Unrealized gain (loss) on available-for-sale securities	29	(558)	(70)	(420)
Unrealized gain (loss) on cash flow hedges	9,240	(4,908)	13,291	(2,647)
Defined benefit plans	$ (4)	$ (2)	$ (10)	$ (6)