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Summary of Significant Accounting Policies - Mezzanine Loans and Impairments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Mortgage loans on real estate |  |  |
Interest rate (as a percent) | 7.25% |  |
Loan Term | 4 years |  |
Allowance for Doubtful Accounts |  |  |
Accrued interest receivable | $ 46,000,000 |  |
Write-off of accrued interest receivable | 0 | $ 0 | $ 0
Impairments |  |  |
Impairment of Real Estate | $ 3,422,000 | $ 0 | $ 3,977,000
Minimum |  |  |
Mortgage loans on real estate |  |  |
Interest rate (as a percent) |  | 4.00% |
Maximum |  |  |
Mortgage loans on real estate |  |  |
Interest rate (as a percent) |  | 8.00% |
Loan Term | 4 years |  |
Mezzanine Loans | Minimum |  |  |
Mortgage loans on real estate |  |  |
Interest rate (as a percent) | 7.00% |  |
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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