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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Allocation of Carrying Value of Loan Portfolio Based on Internal Risk Ratings (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 49 | 50
Total | $ 8,318,448 | $ 8,384,575
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00%
Year 1 | $ 0 | $ 440,720
Year 2 | 642,657 | 2,707,083
Year 3 | 2,744,155 | 2,285,902
Year 4 | 2,256,534 | 557,204
Year 5 | 417,696 | 1,597,927
Prior | 2,257,406 | 795,739
General CECL Allowance | (32,558) | (26,482)
Carrying value, net | $ 8,285,890 | $ 8,358,093
Weighted-Average Risk Rating | 3.0 | 3.0
Gross write-offs | $ 0 | $ 81,890
Off-balance-sheet, credit loss, liability, amount excluded | $ 3,600 |
1 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 0 | 0
Total | $ 0 | $ 0
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 0.00% | 0.00%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 0
Year 5 | 0 | 0
Prior | $ 0 | $ 0
2 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 4 | 4
Total | $ 447,202 | $ 478,440
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.40% | 5.70%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 280,572
Year 3 | 332,059 | 0
Year 4 | 49,729 | 0
Year 5 | 0 | 132,309
Prior | $ 65,414 | $ 65,560
3 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 41 | 42
Total | $ 7,658,452 | $ 7,548,252
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 92.10% | 90.00%
Year 1 | $ 0 | $ 440,720
Year 2 | 642,657 | 2,426,511
Year 3 | 2,412,096 | 2,285,902
Year 4 | 2,206,805 | 387,323
Year 5 | 389,815 | 1,465,618
Prior | $ 2,007,079 | $ 542,177
4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 2 | 2
Total | $ 85,612 | $ 88,112
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 1.00% | 1.10%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 0
Year 5 | 0 | 0
Prior | $ 85,612 | $ 88,112
5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Number of Loans | loan | 2 | 2
Total | $ 127,182 | $ 269,771
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 1.50% | 3.20%
Year 1 | $ 0 | $ 0
Year 2 | 0 | 0
Year 3 | 0 | 0
Year 4 | 0 | 169,881
Year 5 | 27,881 | 0
Prior | $ 99,301 | $ 99,890

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