Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Rollforward
Beginning of Period	$ 1,147,742	$ 1,024,331	$ 1,136,729	$ 1,464,227
Other comprehensive (loss) income):
Foreign currency translation and other adjustments	(90,465)	44,529	(114,065)	(109,090)
Change in fair value of derivative instruments	14,665	(184)	35,505	(11,507)
Total other comprehensive (loss) income	(75,800)	44,345	(78,560)	(120,597)
End of period	975,146	937,246	975,146	937,246
FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS
AOCI Rollforward
Beginning of Period	(229,790)	(406,444)	(206,190)	(252,825)
Other comprehensive (loss) income):
Foreign currency translation and other adjustments	(90,465)	44,529	(114,065)	(109,090)
Change in fair value of derivative instruments	0	0	0	0
Total other comprehensive (loss) income	(90,465)	44,529	(114,065)	(109,090)
End of period	(320,255)	(361,915)	(320,255)	(361,915)
CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTS
AOCI Rollforward
Beginning of Period	(28,863)	(21,079)	(49,703)	(9,756)
Other comprehensive (loss) income):
Foreign currency translation and other adjustments	0	0	0	0
Change in fair value of derivative instruments	14,665	(184)	35,505	(11,507)
Total other comprehensive (loss) income	14,665	(184)	35,505	(11,507)
End of period	(14,198)	(21,263)	(14,198)	(21,263)
TOTAL
AOCI Rollforward
Beginning of Period	(258,653)	(427,523)	(255,893)	(262,581)
Other comprehensive (loss) income):
End of period	$ (334,453)	$ (383,178)	$ (334,453)	$ (383,178)