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Participations Sold (Details) $ in Thousands, £ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 GBP (£) | Oct. 31, 2020 USD ($)
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |  |
Payment in kind interest |  |  | $ 47,700 |  | $ 46,700 | $ 54,600 |  |
Total carrying value, net |  |  | 7,857,260 |  | 6,496,977 |  |  |
Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net | [1],[2] |  | 7,012,312 |  | 5,451,084 |  |  |
Participations sold balance, increase |  |  | 17,800 |  |  |  |  |
Participations sold balance, increase, add on funding amount |  |  | 18,300 | £ 13.3 |  |  |  |
Unrealized loss on foreign currency translation |  |  | $ 500 |  |  |  |  |
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 |  |  |  |  | 95,200 |  | £ 70.3 |
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 |
[1] | Includes $5,957,707 and $5,418,999 pledged as collateral under secured debt arrangements in 2021 and 2020, respectively.
[2] | Net of $178,588 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 a nd $175,000 Specific CECL Allowance and $33,588 and $38,102 General CECL Allowance, respectively.

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