Senior Unsecured Notes and Secured Debt - Summary of Principal Activity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Amount
Ending balance	$ 14,814,953
Senior unsecured notes
Amount
Beginning balance	11,707,961	$ 11,509,533
Debt issued	1,050,000	1,250,000
Debt extinguished	0	(1,533,752)
Foreign currency	(143,634)	27,204
Ending balance	$ 12,614,327	$ 11,252,985
Weighted Avg. Interest Rate
Beginning balance	3.67%	3.67%
Debt issued	0.0308	0.0250
Debt extinguished	0	0.0242
Foreign currency	0.0414	0.0357
Ending balance	3.68%	3.71%
Secured debt
Amount
Beginning balance	$ 2,202,312	$ 2,378,073
Debt issued	10,344	0
Debt assumed	221,159	0
Debt extinguished	(196,504)	(66,593)
Principal payments	(30,350)	(31,670)
Foreign currency	(6,335)	31,318
Ending balance	$ 2,200,626	$ 2,311,128
Weighted Avg. Interest Rate
Beginning balance	3.03%	3.27%
Debt issued	0.0323	0
Debt assumed	0.0432	0
Debt extinguished	0.0415	0.0601
Principal payments	0.0329	0.0348
Foreign currency	0.0297	0.0289
Ending balance	3.43%	3.10%