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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 8,001,336 | $ 8,708,214
General CECL allowance | (27,305) | (26,224)
Carrying value, net | $ 7,974,031 | $ 8,681,990
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00%
Off-balance-sheet, credit loss, liability, amount excluded | $ 4,000 | $ 4,300
United Kingdom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 2,482,587 | $ 2,470,532
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 31.00% | 28.40%
New York City |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,723,669 | $ 2,049,493
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 21.50% | 23.50%
Other Europe |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,396,418 | $ 1,542,462
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 17.50% | 17.70%
Germany |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 5.20% | 4.90%
Italy |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 470.00% | 5.40%
Spain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 4.20% | 3.80%
Sweden |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 290.00% | 2.80%
Ireland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 0.50% | 0.70%
Midwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 533,692 | $ 592,756
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.70% | 6.80%
Southeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 533,852 | $ 642,542
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.70% | 7.40%
West |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 577,416 | $ 584,247
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.20% | 6.70%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 753,702 | $ 826,182
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.40% | 9.50%
Percentage of Portfolio | 90.00% | 0.30%
Northeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 550.00% | 5.50%
Southwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 180.00% | 2.30%
Mid-Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 120.00% | 1.40%
Hotel |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,903,246 | $ 2,117,079
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 23.80% | 24.30%
Office |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,494,101 | $ 1,671,006
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 18.70% | 19.20%
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,245,131 | $ 1,537,541
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 15.50% | 17.70%
Retail Site |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 1,375,338 | $ 1,364,752
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 17.20% | 15.70%
Health Care |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 520,208 | $ 575,144
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.50% | 6.60%
Mixed Use |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 637,492 | $ 559,809
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.00% | 6.40%
Industrial Property |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 282,758 | $ 296,860
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 3.50% | 3.40%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Carrying Value | $ 543,062 | $ 586,023
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.80% | 6.70%
Parking Garage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 270.00% | 3.10%
Urban Predevelopment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 160.00% | 1.30%
Caravan Park |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 250.00% | 2.30%

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