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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Consolidated SLST | VIE, Primary Beneficiary |  |  |
Assets |  |  |
Unrealized gains (losses) |  | $ 0 | $ (88,100)
Distressed and other residential mortgage loans, at fair value |  |  |
Assets |  |  |
Unrealized gains (losses) | $ (76,295) | 9,337 |
Residential Loans Held in Securitization Trusts |  |  |
Assets |  |  |
Unrealized gains (losses) |  | 0 | (1,700)
Investment in unconsolidated entities |  |  |
Assets |  |  |
Unrealized gains (losses) | (4,023) | 3,661 |
Preferred equity and mezzanine loan investments |  |  |
Assets |  |  |
Unrealized gains (losses) |  | 0 | (5,559)
Multi-family loans held in securitization trust |  |  |
Assets |  |  |
Unrealized gains (losses) |  | 274,683 | $ 0
Multi-family collateralized debt obligations, at fair value |  |  |
Liabilities |  |  |
Unrealized gains (losses) | 0 | (265,273) |
Residential collateralized debt obligations, at fair value |  |  |
Liabilities |  |  |
Unrealized gains (losses) | $ 21,966 | $ 0 |

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