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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) jointVenture | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Nov. 12, 2020 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Principal balance |  | $ 14,700 |  | $ 14,700 |  |  |
Purchase of senior securities |  |  |  | 44 | $ 225 |  |
Realized loss |  | (4,989) | $ 934 | (12,047) | 148,852 |  |
Realized loss on de-consolidation of Consolidated K-Series |  | 0 | 0 | 0 | 54,118 |  |
Unrealized losses, net |  | (23,854) | $ (102,872) | $ (50,020) | 293,908 |  |
Number of joint venture invested in during period | jointVenture |  |  |  | 2 |  |  |
Non-controlling interest in consolidated variable interest entities |  | 5,198 |  | $ 5,198 |  | $ 6,371 |
VIE, Primary Beneficiary | Preferred equity investments in multi-family properties |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Investment owned, fair value |  |  |  |  |  |  | $ 8,700
Operating real estate |  | 73,500 |  | 73,500 |  |  | 50,500
Lease intangible |  | 5,000 |  | 5,000 |  |  | 1,600
Mortgages payable in consolidated variable interest entities |  | 61,800 |  | 61,800 |  |  | 36,800
Non-controlling interest in consolidated variable interest entities |  | 1,900 |  | 1,900 |  |  | $ 6,800
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Investment in Consolidated SLST limited to securities owned, net carrying value |  | $ 228,300 |  | $ 228,300 |  | $ 212,100 |
Purchase of senior securities |  |  |  |  | 40,000 |  |
Proceeds from sale of investment |  |  |  |  | 62,600 |  |
Realized loss |  |  |  |  | $ 2,400 |  |
VIE, Primary Beneficiary | Consolidated K-Series |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Multi-family loans held in securitization trusts, at Fair Value | $ 17,400,000 |  |  |  |  |  |
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation | 237,300 |  |  |  |  |  |
VIE, Primary Beneficiary | Consolidated K-Series | Multi Family Collateralized Debt Obligations |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Collateralized debt, carrying value | 16,600,000 |  |  |  |  |  |
VIE, Primary Beneficiary | Consolidated K-Series | Fist Loss POs And Mezzanine Securities |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Proceeds from sales resulting in de-consolidation of Consolidated K-Series | 555,200 |  |  |  |  |  |
Realized loss on de-consolidation of Consolidated K-Series | 54,100 |  |  |  |  |  |
Unrealized losses, net | $ 168,500 |  |  |  |  |  |

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