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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2022 | Mar. 31, 2022 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt | $ 500 | $ 600 |  | $ (2,214) | $ 1,583 | $ 0
Payments to acquire other investments |  |  |  | 100 | 98 | 477
Realized gains (losses), net |  |  |  | 27,549 | 21,451 | (148,058)
Proceeds from divestiture of interest in consolidated subsidiaries |  |  |  | 100,666 | 8,108 | 5,751
Deconsolidation gain (loss) amount |  |  |  | 0 | 0 | (54,118)
Unrealized (losses) gains, net |  |  |  | (321,081) | 95,649 | (160,161)
VIE, Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Principal balance |  |  |  | 14,700 | 203,500 |
Loss on extinguishment of debt |  |  |  | 1,600 |  |
Consolidated SLST |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Proceeds from sale of other investments |  |  |  |  |  | 62,600
Realized gains (losses), net |  |  |  |  |  | 2,400
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Investment in Consolidated SLST limited to securities owned, net carrying value |  |  |  | $ 191,500 | $ 230,300 |
Payments to acquire other investments |  |  |  |  |  | $ 40,000
Consolidated K-Series | VIE, Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Deconsolidation of financial instruments |  |  | $ 17,400,000 |  |  |
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation |  |  | 237,300 |  |  |
Consolidated K-Series | VIE, Primary Beneficiary | Multi-family loans |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Collateralized debt obligations |  |  | 16,600,000 |  |  |
Consolidated K-Series | VIE, Primary Beneficiary | First Loss POs And Mezzanine Securities |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Proceeds from divestiture of interest in consolidated subsidiaries |  |  | 555,200 |  |  |
Deconsolidation gain (loss) amount |  |  | (54,100) |  |  |
Unrealized (losses) gains, net |  |  | $ 168,500 |  |  |

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