Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Rollforward
Beginning of Period	$ 1,123,841	$ 1,737,608	$ 1,464,227	$ 1,862,463
Other comprehensive income (loss):
End of Period	1,024,331	1,658,981	1,024,331	1,658,981
Foreign Currency Translation Adjustments
AOCI Rollforward
Beginning of Period	(475,130)	(247,313)	(252,825)	(264,691)
Other comprehensive income (loss):
Foreign currency translation adjustment	68,686	(5,930)	(153,619)	11,448
Change in fair value of derivative instruments	0	0	0	0
Total other comprehensive income (loss)	68,686	(5,930)	(153,619)	11,448
End of Period	(406,444)	(253,243)	(406,444)	(253,243)
Change in Fair Value of Derivative Instruments
AOCI Rollforward
Beginning of Period	(18,118)	(3,647)	(9,756)	(973)
Other comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Change in fair value of derivative instruments	(2,961)	(4,931)	(11,323)	(7,605)
Total other comprehensive income (loss)	(2,961)	(4,931)	(11,323)	(7,605)
End of Period	(21,079)	(8,578)	(21,079)	(8,578)
Total
AOCI Rollforward
Beginning of Period	(493,248)	(250,960)	(262,581)	(265,664)
Other comprehensive income (loss):
Foreign currency translation adjustment	68,686	(5,930)	(153,619)	11,448
Change in fair value of derivative instruments	(2,961)	(4,931)	(11,323)	(7,605)
Total other comprehensive income (loss)	65,725	(10,861)	(164,942)	3,843
End of Period	$ (427,523)	$ (261,821)	$ (427,523)	$ (261,821)