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Participations Sold (Details) $ in Thousands, £ in Millions | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Oct. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
--- | --- | --- | --- | --- | ---
Participating Mortgage Loans [Line Items] |  |  |  |  |
Total carrying value, net | $ 6,820,074 | $ 6,496,977 |  |  | $ 6,430,618
Mezzanine, Amortized cost | Secured Debt |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |
Total carrying value, net |  | 97,100 | £ 70.5 | $ 88,500 |
Mezzanine, Amortized cost | Ground-up Condominium Development - New York |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 25,000 |
Mezzanine, Amortized cost | 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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