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Participations Sold (Details) $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Oct. 31, 2020 USD ($)
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Payment in kind interest |  | $ 1,200 | $ 16,800 |  |  |  |
Total carrying value, net |  | 8,350,042 |  | $ 7,857,260 |  |  |
Participating mortgage loans, participation liabilities, amount decrease |  | $ 800 |  |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Debt instrument, decrease in participating interest | $ 27,700 |  |  |  |  |  |
Payment in kind interest | $ 2,700 |  |  |  |  |  |
Mezzanine Loans | Secured Debt |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  | $ 92,700 | £ 70.5 |
Mezzanine Loans | Ground-up Condominium Development - New York |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 25,000
Mezzanine Loans | Office Building - London |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 8,900 | 6.7 |
Remaining unfunded commitment |  |  |  |  | $ 25,300 | £ 19.1 |

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