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Summary of Significant Accounting Policies - Mezzanine Loans and Impairments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Mortgage loans on real estate |  |  |  |
Interest rate (as a percent) | 8.50% |  |  |
Allowance for Doubtful Accounts |  |  |  |
Accrued interest receivable | $ 53,960,000 | $ 53,960,000 |  |
Write-off of accrued interest receivable |  | 0 | $ 0 | $ 0
Impairments |  |  |  |
Impairment of Real Estate |  | $ 15,775,000 | $ 3,422,000 | $ 0
Mezzanine Loans | Minimum |  |  |  |
Mortgage loans on real estate |  |  |  |
Interest rate (as a percent) |  | 8.00% |  |
Loan Term |  | 4 years |  |
Mezzanine Loans | Maximum |  |  |  |
Mortgage loans on real estate |  |  |  |
Interest rate (as a percent) |  | 12.00% |  |
Loan Term |  | 5 years |  |

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