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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Rollforward
Beginning of Period	$ 1,136,729	$ 1,464,227
Other comprehensive (loss) income:
Foreign currency translation and other adjustments	(66,224)	(222,305)
Change in fair value of derivative instruments	15,206	(8,362)
Total other comprehensive (loss) income	(51,018)	(230,667)
End of period	959,707	1,123,841
FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS
AOCI Rollforward
Beginning of Period	(206,190)	(252,825)
Other comprehensive (loss) income:
Foreign currency translation and other adjustments	(66,224)	(222,305)
Change in fair value of derivative instruments	0	0
Total other comprehensive (loss) income	(66,224)	(222,305)
End of period	(272,414)	(475,130)
CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTS
AOCI Rollforward
Beginning of Period	(49,703)	(9,756)
Other comprehensive (loss) income:
Foreign currency translation and other adjustments	0	0
Change in fair value of derivative instruments	15,206	(8,362)
Total other comprehensive (loss) income	15,206	(8,362)
End of period	(34,497)	(18,118)
TOTAL
AOCI Rollforward
Beginning of Period	(255,893)	(262,581)
Other comprehensive (loss) income:
End of period	$ (306,911)	$ (493,248)

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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