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Schedule IV - Mortgage Loans on Real Estate - Summary of Changes in Carrying Amounts of Mortgage Loans (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
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May 24, 2021 | Dec. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  | $ 7,857,260,000 | $ 6,496,977,000 |
Loan fundings |  |  |  |  |  | 3,624,661,000 | 3,334,062,000 |
Loan repayments |  |  |  |  |  | (2,214,621,000) | (1,881,211,000) |
(Loss) gain on foreign currency translation |  |  |  |  |  | (356,436,000) | (93,241,000) |
Realized (loss) on investment |  |  |  |  |  | (24,894,000) | (20,767,000) |
Transfer to real estate owned, held for sale |  |  |  |  |  | (226,459,000) | (45,289,000) |
Specific CECL Allowance |  |  |  |  |  | 11,500,000 | 30,000,000 |
General CECL Allowance |  |  |  |  |  | 7,364,000 | 4,514,000 |
Deferred Fees |  |  |  |  |  | (46,874,000) | (42,911,000) |
PIK interest, amortization of fees and other items |  |  |  |  |  | 50,489,000 | 75,126,000 |
Balance at the close of year |  | $ 8,681,990,000 |  |  |  | 8,681,990,000 | 7,857,260,000 | $ 6,496,977,000
Realized loss on investments |  |  |  |  |  | (18,683,000) | 20,767,000 | 47,632,000
Allowance for credit loss, current |  | (7,000,000) | $ (7,000,000) |  |  | (7,000,000) |  |
Decrease in Specific CECL Allowance, net | $ (10,000,000) |  | $ 10,000,000 | $ (20,000,000) |  | 11,500,000 |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  | (7,000,000) | 0 |
Increase (decrease) in current expected credit loss allowance, net |  |  |  |  |  | (17,623,000) | (34,773,000) | 125,600,000
Off-balance sheet, credit loss, liability |  | 4,347,000 |  |  |  | 4,347,000 | 3,106,000 | $ 3,365,000
Interest received for loans in cost recovery |  |  |  |  |  | 3,200,000 | 1,400,000 |
Urban predevelopment - Miami, FL |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  |  |  | 53,000,000 |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  | (15,000,000) |  |
Multifamily Development - Brooklyn, NY |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  |  |  | (10,000,000) |  |
Increase (decrease) in current expected credit loss allowance, net |  |  |  |  |  | (30,000,000) |  |
Residential-for-Sale - Manhattan, NY |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Decrease in Specific CECL Allowance, net |  |  |  |  |  | (66,500,000) |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  | (7,000,000) |  |
Sale of Mezzanine Loan |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Realized (loss) on investment |  |  |  |  | $ 0 |  | 800,000 |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
(Loss) gain on foreign currency translation |  |  |  |  |  | (360,818,000) |  |
Transfer to real estate owned, held for sale |  |  |  |  |  | (226,459,000) |  |
Realized loss on investments |  |  |  |  |  |  | 20,000,000 |
Decrease in Specific CECL Allowance, net |  |  |  |  |  | 11,500,000 |  |
Increase (decrease) in current expected credit loss allowance, net |  |  |  |  |  | 13,396,000 | (20,000,000) |
Sale of Mezzanine Loan | Luxury Hotel - Washington D.C. |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  | $ (10,000,000) |
CCOF Design Venture, LLC | Affiliated Entity |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Realized loss on investments |  |  |  |  |  | $ 17,900,000 |  |
Decrease in Specific CECL Allowance, net |  | $ (17,900,000) |  |  |  |  |  |

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