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Commitments and Contingencies - Contractual Commitments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Agency Business Commitments [Line Items] |  |  |
Cash collateral per securitization | $ 5,000 |  |
Outstanding letters of credit | 5,000 |  |
Debt Obligations |  |  |
2024 | 1,855,247 |  |
2025 | 2,523,024 |  |
2026 | 1,996,721 |  |
2027 | 4,510,642 |  |
2028 | 946,089 |  |
Thereafter | 154,336 |  |
Net Carrying Value | 11,986,059 |  |
Minimum Annual Operating Lease Payments |  |  |
2024 | 10,820 |  |
2025 | 11,206 |  |
2026 | 11,297 |  |
2027 | 9,782 |  |
2028 | 9,064 |  |
Thereafter | 27,755 |  |
Total | 79,924 |  |
Total |  |  |
2024 | 1,866,067 |  |
2025 | 2,534,230 |  |
2026 | 2,008,018 |  |
2027 | 4,520,424 |  |
2028 | 955,153 |  |
Thereafter | 182,091 |  |
Total | $ 12,065,983 |  |
Operating Lease, Weighted average remaining lease term (in years) | 7 years 7 months 6 days | 8 years 2 months 12 days |
Operating Lease, Weighted average discount rate (as a percent) | 5.70% | 6.80% |
Operating lease expense | $ 10,900 | $ 9,600 | $ 9,300
Unfunded CLO Commitments |  |  |
Unfunded commitments related to structured loans and investments | 1,310,000 | $ 1,150,000 |
Fannie Mae Mortgage |  |  |
Agency Business Commitments [Line Items] |  |  |
Minimum liquid assets to be maintained to meet operational liquidity requirements | $ 20,300 |  |
Period of funding for collateral requirement | 48 months |  |
Letter of credit required amount | $ 76,200 |  |
Letter of credit assigned | 64,000 |  |
Reserve required to fund additional restricted liquidity over the next 48 months | $ 36,600 |  |
Period of additional funding for collateral requirement | 48 months |  |
Forward Contracts |  |  |
Agency Business Commitments [Line Items] |  |  |
Period of contractual commitment | 60 days |  |
Minimum |  |  |
Total |  |  |
Remaining lease term | 9 months 18 days | 2 months 12 days |
Maximum |  |  |
Total |  |  |
Remaining lease term | 10 years 1 month 6 days | 10 years 4 months 24 days |

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