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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 8,318,448 |  | $ 8,384,575
General CECL allowance | (32,558) |  | (26,482)
Carrying value, net | $ 8,285,890 |  | $ 8,358,093
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% |  | 100.00%
Off-balance-sheet, credit loss, liability, amount excluded | $ 3,600 |  |
United Kingdom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 2,937,602 |  | $ 2,675,097
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 35.30% |  | 31.90%
New York City |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 1,597,081 |  | $ 1,736,856
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 19.20% |  | 20.70%
Other Europe |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 1,509,453 |  | $ 1,686,425
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 18.20% |  | 20.10%
Germany |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 7.30% | 7.40% |
Italy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 3.30% | 4.90% |
Spain |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 4.10% | 4.20% |
Sweden |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 2.80% | 2.90% |
Ireland |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 0.50% | 0.50% |
Netherlands |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 0.20% | 0.20% |
Midwest |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 519,395 |  | $ 522,137
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.20% |  | 6.20%
Southeast |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 537,333 |  | $ 535,054
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.50% |  | 6.40%
Percentage of Portfolio | 1.70% |  |
West |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 484,581 |  | $ 484,842
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.80% |  | 5.80%
Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 733,003 |  | $ 744,164
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.80% |  | 8.90%
Percentage of Portfolio | 1.10% | 1.10% |
Northeast |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 4.90% | 5.00% |
Southwest |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio |  | 1.70% |
Mid-Atlantic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 1.10% | 1.10% |
Hotel |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 1,978,794 |  | $ 2,128,256
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 23.70% |  | 25.40%
Office |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 1,635,450 |  | $ 1,593,320
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 19.70% |  | 19.00%
Retail Site |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 1,394,228 |  | $ 1,407,764
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 16.80% |  | 16.80%
Residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 1,099,134 |  | $ 1,247,238
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 13.20% |  | 14.90%
Mixed Use |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 696,048 |  | $ 679,303
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.40% |  | 8.10%
Health Care |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 504,075 |  | $ 511,803
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.10% |  | 6.10%
Industrial Property |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 276,350 |  | $ 293,133
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 3.30% |  | 3.50%
Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 734,369 |  | $ 523,758
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.80% |  | 6.20%
Pubs |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 2.50% |  |
Parking Garage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 2.30% |  | 2.30%
Caravan Park |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 2.40% |  | 2.40%
Urban Predevelopment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of Portfolio | 1.60% |  | 1.50%

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