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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - Collateralized Debt Obligations - Consolidated SLST - VIE, Primary Beneficiary - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 839,419 | $ 1,054,335
Total gains (realized/unrealized) |  |
Included in earnings | (51,438) | (34,748)
Paydowns | (33,717) | (27,299)
Balance at the end of period | $ 754,264 | $ 992,288

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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