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Other Investments (Other Real Estate Equity Investments) (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2021 USD ($) loan | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net proceeds from sales of loans receivable |  |  |  | $ 122,609,000 | $ 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 |  | $ 43,700,000 |  | $ 43,700,000 |  | $ 58,700,000
Other real estate equity investments | Land and Land Development |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments |  | $ 500,000 |  | $ 500,000 |  | $ 31,200,000
Other Real Estate Equity Investment Aug 2018 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity interest |  | 50.00% |  | 50.00% |  |
Loans receivable, carrying value |  | $ 33,000,000.0 |  | $ 33,000,000.0 |  |
Interest income |  | $ 600,000 | $ 600,000 | $ 1,700,000 | $ 1,800,000 |
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] |  |  |  |  |  |
Equity interest |  | 53.00% |  | 53.00% |  |
Commitment to provide loan to lessee |  | $ 75,000,000.0 |  | $ 75,000,000.0 |  |

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