Disclosure about Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial assets:
Equity securities	$ 958
Restricted cash	78,912	$ 77,490	[1]
Foreign currency forward contracts, interest rate swaps and cross currency swaps	108,156
Equity warrants	37,404
Carrying Amount
Financial assets:
Equity securities		1,608
Cash and cash equivalents	363,339	269,265
Restricted cash	78,912	77,490
Foreign currency forward contracts, interest rate swaps and cross currency swaps	135,854	7,205
Equity warrants	37,404	41,909
Financial liabilities:
Unsecured credit facility and commercial paper	354,000	324,935
Senior unsecured notes	12,488,718	11,613,758
Secured debt	2,191,826	2,192,261
Foreign currency forward contracts, interest rate swaps and cross currency swaps	27,698	39,296
Redeemable OP unitholder interests	122,287	153,098
Carrying Amount | Mortgage loans receivable
Financial assets:
Loans receivable	748,833	877,102
Carrying Amount | Other real estate loans receivable
Financial assets:
Loans receivable	207,452	191,579
Carrying Amount | Non-real estate loans receivable
Financial assets:
Loans receivable	257,697	223,627
Fair Value
Financial assets:
Equity securities	958	1,608
Cash and cash equivalents	363,339	269,265
Restricted cash	78,912	77,490
Foreign currency forward contracts, interest rate swaps and cross currency swaps	135,854	7,205
Equity warrants	37,404	41,909
Financial liabilities:
Unsecured credit facility and commercial paper	354,000	324,935
Senior unsecured notes	11,987,673	13,139,748
Secured debt	2,153,353	2,252,107
Foreign currency forward contracts, interest rate swaps and cross currency swaps	27,698	39,296
Redeemable OP unitholder interests	122,287	153,098
Fair Value | Mortgage loans receivable
Financial assets:
Loans receivable	914,562	932,552
Fair Value | Other real estate loans receivable
Financial assets:
Loans receivable	213,867	193,999
Fair Value | Non-real estate loans receivable
Financial assets:
Loans receivable	$ 266,817	$ 241,544

[1] The consolidated balance sheet at December 31, 2021 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.