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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 24, 2021 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Principal Balance |  |  |  |  |  |  |  |  |  |  |
Principal value, beginning balance |  |  |  |  |  |  |  |  | $ 8,708,214 |  |
Principal value, ending balance |  | $ 8,001,336 |  | $ 8,708,214 |  |  |  |  | 8,001,336 |  | $ 8,708,214
Deferred Fees/Other Items |  |  |  |  |  |  |  |  |  |  |
Net realized loss on investment |  |  |  |  |  |  |  |  | (763) |  |
Specific CECL Allowance |  |  |  |  |  |  |  |  |  |  |
Specific provision for loan loss, beginning |  |  |  |  |  |  |  |  | (133,500) |  |
Specific provision for loan loss, ending |  | (193,000) |  | (133,500) |  |  |  |  | (193,000) |  | (133,500)
Carry Value, Net |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net | $ (10,000) |  |  |  |  | $ 10,000 |  | $ (20,000) |  |  |
Net realized loss on investment |  | 0 |  |  | $ 43,577 |  |  |  | (86,604) | $ 43,577 |
General CECL allowance |  | (27,305) |  | (26,224) |  |  |  |  | (27,305) |  | (26,224)
Carrying value, net |  | 7,974,031 |  | 8,681,990 |  |  |  |  | 7,974,031 |  | 8,681,990
Off-balance-sheet, credit loss, liability, amount excluded |  | 4,000 |  | 4,300 |  |  |  |  | 4,000 |  | 4,300
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Principal Balance |  |  |  |  |  |  |  |  |  |  |
Principal value, beginning balance |  |  |  |  |  |  |  |  | 8,892,767 |  |
New funding of loans |  |  |  |  |  |  |  |  | 181,017 |  |
Add-on loan fundings |  |  |  |  |  |  |  |  | 341,796 |  |
Loan repayments and sales |  |  |  |  |  |  |  |  | (1,020,590) |  |
Gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  | (4,999) |  |
Net realized loss on investment |  |  |  |  |  |  |  |  | (87,367) |  |
Transfer to real estate owned |  |  |  |  |  |  |  |  | (75,000) |  |
Payment-in-kind interest and amortization of fees |  |  |  |  |  |  |  |  | 0 |  |
Principal value, ending balance |  | 8,227,624 |  | 8,892,767 |  |  |  |  | 8,227,624 |  | 8,892,767
Deferred Fees/Other Items |  |  |  |  |  |  |  |  |  |  |
Deferred fees/other items, beginning |  |  |  |  |  |  |  |  | (51,053) |  |
Gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  | 83 |  |
Transfer to real estate owned |  |  |  |  |  |  |  |  | 0 |  |
Deferred fees and other items |  |  |  |  |  |  |  |  | (9,191) |  |
Payment-in-kind interest and amortization of fees |  |  |  |  |  |  |  |  | 26,110 |  |
Deferred fees/other items, ending |  | (33,288) |  | (51,053) |  |  |  |  | (33,288) |  | (51,053)
Specific CECL Allowance |  |  |  |  |  |  |  |  |  |  |
Specific provision for loan loss, beginning |  | (193,000) | $ (133,500) | (119,000) | (172,000) | (175,000) | $ (145,000) |  | (133,500) | (145,000) | (145,000)
Specific provision for loan loss, ending |  | (193,000) | $ (193,000) | (133,500) | $ (119,000) | $ (172,000) | $ (175,000) |  | (193,000) | $ (119,000) | (133,500)
Carry Value, Net |  |  |  |  |  |  |  |  |  |  |
Carrying value, beginning balance |  |  |  |  |  |  |  |  | 8,708,214 |  |
New funding of loans |  |  |  |  |  |  |  |  | 181,017 |  |
Add-on loan fundings |  |  |  |  |  |  |  |  | 341,796 |  |
Loan repayments and sales |  |  |  |  |  |  |  |  | (1,020,590) |  |
Gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  | (4,916) |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  | (59,500) |  |
Transfer to real estate owned, held for sale |  |  |  |  |  |  |  |  | (75,000) |  |
Deferred fees and other items |  |  |  |  |  |  |  |  | (9,191) |  |
Payment-in-kind interest and amortization of fees |  |  |  |  |  |  |  |  | 26,110 |  |
Carrying value, ending balance |  | 8,001,336 |  | 8,708,214 |  |  |  |  | 8,001,336 |  | 8,708,214
Carrying value, net |  | $ 102,600 |  | $ 138,300 |  |  |  |  | $ 102,600 |  | $ 138,300

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