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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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