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Other Investments (Other Real Estate Equity Investments) (Details)	1 Months Ended						3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Feb. 28, 2022 USD ($)	Jan. 31, 2022 USD ($) lease	Dec. 31, 2021 USD ($)	Nov. 30, 2021 USD ($)	Jan. 31, 2021 USD ($) loan	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1,556,792,000			$ 1,297,281,000				$ 1,556,792,000
Net proceeds from sales of loans receivable								145,583,000	$ 79,560,000
Income from sales of real estate							$ 96,000	$ 492,000	708,000
Payments to acquire property					$ 33,300,000
Ground Lease Plus Fund
Schedule of Equity Method Investments [Line Items]
Number of ground leases sold | lease			2
Income from sales of real estate			$ 500,000	0
Other real estate equity investments | Minimum
Schedule of Equity Method Investments [Line Items]
Equity interest	48.00%							48.00%
Other real estate equity investments | Maximum
Schedule of Equity Method Investments [Line Items]
Equity interest	95.00%							95.00%
Other real estate equity investments | Operating Properties
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 38,200,000			43,300,000				$ 38,200,000
Other real estate equity investments | Land
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 300,000			$ 1,100,000				$ 300,000
Other Real Estate Equity Investment Aug 2018
Schedule of Equity Method Investments [Line Items]
Equity Interest sold				50.00%
Interest income							$ 600,000		$ 1,100,000
Other Real Estate Equity Investment January 2021
Schedule of Equity Method Investments [Line Items]
Equity interest						53.00%
Equity method investments						$ 63,300,000
Number of loans sold | loan						2
Net proceeds from sales of loans receivable						$ 83,400,000
Recognized gain or loss						$ 0
Other Real Estate Equity Investment September 2021
Schedule of Equity Method Investments [Line Items]
Commitment to provide loan to lessee										$ 75,000,000.0
Loan Fund [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest	53.00%							53.00%
Loan Fund [Member] | SAFE
Schedule of Equity Method Investments [Line Items]
Commitment to provide loan to lessee	$ 105,000,000.0	$ 130,000,000.0						$ 105,000,000.0
Consideration received for loan commitment	$ 5,000,000.0	$ 9,000,000.0

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