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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Activity Relating to Loan Investment Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2023
Principal Balance |  |  |  |  |
Principal value, beginning balance | $ 8,384,575 |  |  |  |
Principal value, ending balance | 8,318,448 |  |  |  |
Specific CECL Allowance |  |  |  |  |
Specific provision for loan loss, beginning | (193,000) |  |  |  |
Specific provision for loan loss, ending | (335,000) |  |  |  |
Carry Value, Net |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  | $ 10,000 | $ (20,000) |
Valuation allowance, loan held for sale | 0 | $ (4,624) |  |  |
General CECL allowance | (32,558) |  |  |  | $ (26,482)
Carrying value, net | 8,285,890 |  |  |  | $ 8,358,093
Off-balance-sheet, credit loss, liability, amount excluded | 3,600 |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |
Principal Balance |  |  |  |  |
Principal value, beginning balance | 8,610,110 |  |  |  |
Add-on loan fundings | 321,766 |  |  |  |
Loan repayments | (175,731) |  |  |  |
Gain (loss) on foreign currency translation | (72,337) |  |  |  |
Valuation allowance, loan held for sale | (679) |  |  |  |
Amortization of fees | 0 |  |  |  |
Principal value, ending balance | 8,683,129 |  |  |  |
Deferred Fees/Other Items |  |  |  |  |
Deferred fees/other items, beginning | (32,535) |  |  |  |
Gain (loss) on foreign currency translation | 289 |  |  |  |
Valuation allowance, loan held for sale | 0 |  |  |  |
Deferred fees and other items | (4,936) |  |  |  |
Amortization of fees | 7,501 |  |  |  |
Deferred fees/other items, ending | (29,681) |  |  |  |
Specific CECL Allowance |  |  |  |  |
Specific provision for loan loss, beginning | (193,000) | (133,500) |  |  |
Specific provision for loan loss, ending | (335,000) | $ (133,500) |  |  |
Carry Value, Net |  |  |  |  |
Carrying value, beginning balance | 8,384,575 |  |  |  |
Add-on loan fundings | 321,766 |  |  |  |
Loan repayments | (175,731) |  |  |  |
Gain (loss) on foreign currency translation | (72,048) |  |  |  |
Increase in Specific CECL Allowance, net | (142,000) |  |  |  |
Valuation allowance, loan held for sale | (679) |  |  |  |
Deferred fees and other items | (4,936) |  |  |  |
Amortization of fees | 7,501 |  |  |  |
Carrying value, ending balance | $ 8,318,448 |  |  |  |

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