Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Rollforward
Beginning of Period	$ 959,707	$ 1,123,841	$ 1,136,729	$ 1,464,227
Other comprehensive income (loss):
Foreign currency translation and other adjustments	42,624	68,686	(23,600)	(153,619)
Change in fair value of derivative instruments	5,634	(2,961)	20,840	(11,323)
Total other comprehensive income (loss)	48,258	65,725	(2,760)	(164,942)
End of period	1,147,742	1,024,331	1,147,742	1,024,331
FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS
AOCI Rollforward
Beginning of Period	(272,414)	(475,130)	(206,190)	(252,825)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	42,624	68,686	(23,600)	(153,619)
Change in fair value of derivative instruments	0	0	0	0
Total other comprehensive income (loss)	42,624	68,686	(23,600)	(153,619)
End of period	(229,790)	(406,444)	(229,790)	(406,444)
CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTS
AOCI Rollforward
Beginning of Period	(34,497)	(18,118)	(49,703)	(9,756)
Other comprehensive income (loss):
Foreign currency translation and other adjustments	0	0	0	0
Change in fair value of derivative instruments	5,634	(2,961)	20,840	(11,323)
Total other comprehensive income (loss)	5,634	(2,961)	20,840	(11,323)
End of period	(28,863)	(21,079)	(28,863)	(21,079)
TOTAL
AOCI Rollforward
Beginning of Period	(306,911)	(493,248)	(255,893)	(262,581)
Other comprehensive income (loss):
End of period	$ (258,653)	$ (427,523)	$ (258,653)	$ (427,523)