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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | $ 41,063 | $ 0 | $ 28,014 | $ 0
Distressed and other residential mortgage loans, at fair value |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 35,420 | 17,413 | (883) | 37,079
Residential Loans Held in Securitization Trusts |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 817 | 0 | (823) | 0
Investment in unconsolidated entities |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 7 | 449 | (4,052) | 1,295
Preferred equity and mezzanine loan investments |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (955) | 0 | (6,518) | 0
Multi-family loans held in securitization trust |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 0 | 197,837 | 0 | 802,625
Multi-family collateralized debt obligations, at fair value |  |  |  |
Liabilities |  |  |  |
Unrealized gains (losses) | 0 | (190,207) | 0 | (780,378)
Residential collateralized debt obligations, at fair value |  |  |  |
Liabilities |  |  |  |
Unrealized gains (losses) | $ (13,918) | $ 0 | $ (62,907) | $ 0

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + 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 (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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