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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - Consolidated SLST - VIE, Primary Beneficiary - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 617,168 | $ 710,233 | $ 634,495 | $ 839,419
Total gains (realized/unrealized) |  |  |  |
Included in earnings | (20,560) | (24,214) | (16,315) | (81,746)
Paydowns | (11,867) | (25,950) | (33,439) | (97,604)
Balance at the end of period | $ 584,741 | $ 660,069 | $ 584,741 | $ 660,069

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