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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 289,602 | $ 293,183 | $ 118,763
Real estate, net held in Consolidated VIEs |  | 1,017,583 | 50,532 |
Other assets |  | 198,416 | 115,292 |
Total assets | [1] | 5,641,698 | 4,655,587 |
Other liabilities |  | 144,478 | 101,746 |
Total liabilities | [1] | 3,209,916 | 2,348,014 |
Non-controlling interest in consolidated variable interest entities |  | 24,359 | 6,371 |
Residential loan securitizations at amortized cost, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 682,802 | 569,323 |
Residential collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 839,419 | 1,054,335 |
VIE, Primary Beneficiary |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total assets |  | 2,924,678 | 2,150,984 |
Total liabilities |  | 2,219,830 | 1,667,306 |
Redeemable non-controlling interest in Consolidated VIEs |  | 66,392 | 0 |
VIE, Primary Beneficiary | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 29,606 | 462 |
Debt Securities, Available-for-sale |  |  | 109,140 |
Real estate, net held in Consolidated VIEs |  | 927,725 | 50,532 |
Other assets |  | 95,036 | 32,614 |
Total assets |  | 2,924,678 | 2,150,984 |
Collateralized debt obligations |  | 1,522,221 | 1,623,658 |
Mortgages payable, net in consolidated variable interest entities |  | 672,568 | 36,752 |
Other liabilities |  | 25,041 | 6,896 |
Total liabilities |  | 2,219,830 | 1,667,306 |
Redeemable non-controlling interest in Consolidated VIEs |  | 66,392 |  |
Non-controlling interest in consolidated variable interest entities |  | 24,359 | 6,371 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 614,097 | 477,307 |
VIE, Primary Beneficiary | Residential Loan Securitizations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Debt Securities, Available-for-sale |  |  | 0 |
Real estate, net held in Consolidated VIEs |  | 0 | 0 |
Other assets |  | 20,932 | 24,959 |
Total assets |  | 822,361 | 716,410 |
Collateralized debt obligations |  | 682,802 | 554,067 |
Mortgages payable, net in consolidated variable interest entities |  | 0 | 0 |
Other liabilities |  | 4,321 | 2,610 |
Total liabilities |  | 687,123 | 556,677 |
Redeemable non-controlling interest in Consolidated VIEs |  | 0 |  |
Non-controlling interest in consolidated variable interest entities |  | 0 | 0 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 135,238 | 159,733 |
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  |  | 0 |
Debt Securities, Available-for-sale |  |  | 109,140 |
Real estate, net held in Consolidated VIEs |  |  | 0 |
Other assets |  |  | 535 |
Total assets |  |  | 109,675 |
Collateralized debt obligations |  |  | 15,256 |
Mortgages payable, net in consolidated variable interest entities |  |  | 0 |
Other liabilities |  |  | 70 |
Total liabilities |  |  | 15,326 |
Non-controlling interest in consolidated variable interest entities |  |  | 0 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  |  | 94,349 |
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Debt Securities, Available-for-sale |  |  | 0 |
Real estate, net held in Consolidated VIEs |  | 0 | 0 |
Other assets |  | 3,547 | 4,075 |
Total assets |  | 1,074,429 | 1,270,860 |
Collateralized debt obligations |  | 839,419 | 1,054,335 |
Mortgages payable, net in consolidated variable interest entities |  | 0 | 0 |
Other liabilities |  | 3,193 | 2,781 |
Total liabilities |  | 842,612 | 1,057,116 |
Redeemable non-controlling interest in Consolidated VIEs |  | 0 |  |
Non-controlling interest in consolidated variable interest entities |  | 0 | 0 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 231,817 | 213,744 |
VIE, Primary Beneficiary | Consolidated Real Estate |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 29,606 | 462 |
Debt Securities, Available-for-sale |  |  | 0 |
Real estate, net held in Consolidated VIEs |  | 927,725 | 50,532 |
Other assets |  | 70,557 | 3,045 |
Total assets |  | 1,027,888 | 54,039 |
Collateralized debt obligations |  | 0 | 0 |
Mortgages payable, net in consolidated variable interest entities |  | 672,568 | 36,752 |
Other liabilities |  | 17,527 | 1,435 |
Total liabilities |  | 690,095 | 38,187 |
Redeemable non-controlling interest in Consolidated VIEs |  | 66,392 |  |
Non-controlling interest in consolidated variable interest entities |  | 24,359 | 6,371 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 247,042 | 9,481 |
VIE, Primary Beneficiary | Residential loan securitizations at amortized cost, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 682,802 | 569,323 |
VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 839,419 | 1,054,335 |
VIE, Primary Beneficiary | Residential loans, at fair value | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 1,872,311 | 1,958,236 |
VIE, Primary Beneficiary | Residential loans, at fair value | Residential Loan Securitizations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 801,429 | 691,451 |
VIE, Primary Beneficiary | Residential loans, at fair value | Non-Agency RMBS Re-Securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  |  | 0 |
VIE, Primary Beneficiary | Residential loans, at fair value | Consolidated SLST |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 1,070,882 | 1,266,785 |
VIE, Primary Beneficiary | Residential loans, at fair value | Consolidated Real Estate |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | $ 0 | $ 0 |
[1] | Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities (“VIEs”) as the Company is the primary beneficiary of these VIEs. As of December 31, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,924,678 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $2,219,830 and $1,667,306, respectively. See Note 7 for further discussion.

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