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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 | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 638,513 | $ 754,264 | $ 634,495 | $ 839,419
Total gains (realized/unrealized) |  |  |  |
Included in earnings | (10,266) | (6,094) | 4,245 | (57,532)
Paydowns | (11,079) | (37,937) | (21,572) | (71,654)
Balance at the end of period | $ 617,168 | $ 710,233 | $ 617,168 | $ 710,233

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