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Participations Sold (Details) $ in Thousands, £ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Oct. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Participating Mortgage Loans [Line Items] |  |  |  |
Total carrying value, net | $ 6,496,977 |  |  | $ 6,375,093
Mezzanine, Amortized cost | Secured Debt |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |
Total carrying value, net | 96,100 | £ 70.3 | $ 85,700 |
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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