Derivatives and Hedging Activities - Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net investment hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) recognized in accumulated other comprehensive income		$ 27,213		$ 179,056
Amount of gain or (loss) recognized in accumulated other comprehensive income	$ 188,896		$ 227,879
Amount of gain or (loss) excluded from effectiveness testing included in income	5,072		14,163
Amount of gain or (loss) recognized in earnings		0		0
Cash flow hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) excluded from effectiveness testing included in income	(538)		(467)
Amount of gain or (loss) recognized in earnings		3,860		10,290
Amount of gain or (loss) recognized in accumulated other comprehensive income	19,461		26,422
Amount of gain or (loss) recognized in accumulated other comprehensive income		8,246		49,836
Amount of gain or (loss) reclassified from accumulated other comprehensive income to income	13,369		26,840
Amount of gain or (loss) reclassified from accumulated other comprehensive income to income		(1,853)		(17,071)
Foreign currency debt [Member] | Net investment hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) recognized in accumulated other comprehensive income	151,825		181,431
Amount of gain or (loss) recognized in accumulated other comprehensive income		27,213		179,056
Cross-currency interest rate swap [Member] | Net investment hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) recognized in accumulated other comprehensive income	30,505		36,331
Amount of gain or (loss) recognized in accumulated other comprehensive income		0		0
Cross-currency interest rate swap [Member] | Net investment hedges [Member] | Excluded component [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) recognized in accumulated other comprehensive income		0		0
Amount of gain or (loss) recognized in accumulated other comprehensive income	6,566		10,117
Cross-currency interest rate swap [Member] | Net investment hedges [Member] | Interest expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) excluded from effectiveness testing included in income	5,072		14,163
Amount of gain or (loss) recognized in earnings		0		0
Foreign currency forward and option contracts [Member] | Cash flow hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) recognized in accumulated other comprehensive income	20,979		29,345
Amount of gain or (loss) recognized in accumulated other comprehensive income		8,246		49,836
Foreign currency option contracts [Member] | Cash flow hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) recognized in accumulated other comprehensive income	(1,518)		(2,923)
Amount of gain or (loss) recognized in accumulated other comprehensive income		0		0
Foreign currency option contracts [Member] | Cash flow hedges [Member] | Revenues [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) excluded from effectiveness testing included in income	(538)		(555)
Amount of gain or (loss) recognized in earnings		0		0
Foreign currency forward contract [Member] | Cash flow hedges [Member] | Costs and operating expenses [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income to income	(14,474)		(29,548)
Amount of gain or (loss) reclassified from accumulated other comprehensive income to income		1,441		17,542
Foreign currency forward contract [Member] | Cash flow hedges [Member] | Other income (expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) excluded from effectiveness testing included in income	0		88
Amount of gain or (loss) recognized in earnings		3,860		10,290
Foreign currency forward contract [Member] | Cash flow hedges [Member] | Revenues [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income to income	$ 27,843		$ 56,388
Amount of gain or (loss) reclassified from accumulated other comprehensive income to income		$ (3,294)		$ (34,613)