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Related Party Transactions (Details) $ in Thousands, € in Millions, £ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) loan Rate | Mar. 31, 2023 USD ($) loan | Sep. 30, 2022 USD ($) | Sep. 30, 2022 GBP (£) | Sep. 30, 2023 USD ($) loan Rate | Sep. 30, 2022 USD ($) | Mar. 31, 2023 EUR (€) | Mar. 31, 2023 GBP (£) | Feb. 08, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Termination fee, percent fee of base management fee | 300.00% |  |  |  | 300.00% |  |  |  |  |  |  |
Number of loans | loan | 3 |  |  |  | 3 |  |  |  |  |  |  |
Total carrying value, net | $ 7,974,031 |  |  |  | $ 7,974,031 |  |  |  |  | $ 8,681,990 |  |
Increase in management fee payable |  |  |  |  | $ 11 |  |  |  |  |  |  |
Number of independent directors required | Rate | 66.60% |  |  |  | 66.60% |  |  |  |  |  |  |
Atlas Facility |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan | 1 |  |  |  | 1 |  |  |  |  |  |  |
Secured Debt | Credit Suisse Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  | $ 632,300 |  |  |
Secured Debt | Atlas Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity | $ 83,000 |  |  |  | $ 83,000 |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial mortgage loans | loan |  | 3 |  |  |  |  |  |  |  |  |  |
Total carrying value, net | $ 102,600 |  |  |  | $ 102,600 |  |  |  |  | 138,300 |  |
Mixed Use Property - London | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Off-balance-sheet, credit loss, liability, transfers |  |  | $ 327,700 | £ 293.4 |  |  |  |  |  |  |  |
Total carrying value, net | £ |  |  |  |  |  |  |  | £ 15.0 |  |  |  |
Various Properties In Europe | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  | $ 219,000 |  |  |  |  | € 205.7 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, funded, net |  | $ 122,400 |  |  |  |  | € 115.0 |  |  |  |  |
Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan | 3 |  |  |  | 3 |  |  |  |  |  |  |
Arrangement fees |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive Fee Payable |  |  |  |  |  |  |  |  |  |  | $ 400 | $ 200
Management fees |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in management fee payable |  |  |  |  |  | $ 57 |  |  |  |  |  |
Limited Liability Company |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rate of management fees |  |  |  |  | 1.50% |  |  |  |  |  |  |
Extension period |  |  |  |  | 1 year |  |  |  |  |  |  |
Period of termination |  |  |  |  | 180 days |  |  |  |  |  |  |
Termination fee calculation period |  |  |  |  | 24 months |  |  |  |  |  |  |
Limited Liability Company | Management Agreement |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payable to related party | $ 9,500 |  |  |  | $ 9,500 |  |  |  |  | $ 9,700 |  |
Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 30,000
Affiliated Entity | Management Agreement |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Management fees to related party | 9,500 |  | 9,700 |  | 28,400 | 28,600 |  |  |  |  |  |
Professional and Contract Services Expense | $ 800 |  | $ 900 |  | $ 2,100 | $ 3,100 |  |  |  |  |  |

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