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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 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 226,939 | $ 187,107 | $ 227,753 |
Assets of disposal group held for sale |  | 146,363 | 426,017 |  |
Other assets |  | 344,999 | 315,357 |  |
Total Assets | [1] | 7,446,815 | 7,401,328 |  |
Liabilities of disposal group held for sale |  | 122,318 | 386,024 |  |
Other liabilities |  | 110,751 | 118,016 |  |
Total Liabilities | [1] | 5,927,481 | 5,773,202 |  |
Non-controlling interest in Consolidated VIEs |  | 13,950 | 20,453 |  |
Collateralized Debt Obligations | Secured Debt |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 2,188,362 | 1,870,517 |  |
Collateralized Debt Obligations | Residential loan securitizations at amortized cost | Secured Debt |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 1,108,594 | 1,276,780 |  |
Residential loan securitizations at amortized cost, net |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 1,108,594 | 1,276,780 |  |
Consolidated SLST |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 1,079,768 | 593,737 |  |
VIE, Primary Beneficiary |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Real estate, net held in Consolidated VIEs |  | 1,154,221 | 1,131,819 |  |
Total Assets |  | 3,829,183 | 3,816,777 |  |
Total Liabilities |  | 3,192,392 | 3,076,818 |  |
Redeemable non-controlling interest in Consolidated VIEs |  | 20,128 | 28,061 | $ 54,352 | $ 63,803
VIE, Primary Beneficiary | Financing And Other VIEs |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 14,325 | 15,612 |  |
Real estate, net held in Consolidated VIEs |  | 1,005,161 | 979,934 |  |
Assets of disposal group held for sale |  | 146,363 | 426,017 |  |
Other assets |  | 200,958 | 138,446 |  |
Total Assets |  | 3,829,183 | 3,816,777 |  |
Multi-family CDOs, at fair value |  | 2,188,362 | 1,870,517 |  |
Mortgages payable on real estate, net in Consolidated VIEs |  | 850,743 | 784,421 |  |
Liabilities of disposal group held for sale |  | 122,318 | 386,024 |  |
Other liabilities |  | 30,969 | 35,856 |  |
Total Liabilities |  | 3,192,392 | 3,076,818 |  |
Redeemable non-controlling interest in Consolidated VIEs |  | 20,128 | 28,061 |  |
Non-controlling interest in Consolidated VIEs |  | 13,825 | 20,328 |  |
Net investment |  | 602,838 | 691,570 |  |
VIE, Primary Beneficiary | Residential Loan Securitizations |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Real estate, net held in Consolidated VIEs |  | 0 | 0 |  |
Assets of disposal group held for sale |  | 0 | 0 |  |
Other assets |  | 166,374 | 98,451 |  |
Total Assets |  | 1,890,624 | 1,600,359 |  |
Multi-family CDOs, at fair value |  | 1,605,735 | 1,276,780 |  |
Mortgages payable on real estate, net in Consolidated VIEs |  | 0 | 0 |  |
Liabilities of disposal group held for sale |  | 0 | 0 |  |
Other liabilities |  | 9,909 | 8,421 |  |
Total Liabilities |  | 1,615,644 | 1,285,201 |  |
Redeemable non-controlling interest in Consolidated VIEs |  | 0 | 0 |  |
Non-controlling interest in Consolidated VIEs |  | 0 | 0 |  |
Net investment |  | 274,980 | 315,158 |  |
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Real estate, net held in Consolidated VIEs |  | 0 | 0 |  |
Assets of disposal group held for sale |  | 0 | 0 |  |
Other assets |  | 2,905 | 2,960 |  |
Total Assets |  | 741,031 | 757,820 |  |
Multi-family CDOs, at fair value |  | 582,627 | 593,737 |  |
Mortgages payable on real estate, net in Consolidated VIEs |  | 0 | 0 |  |
Liabilities of disposal group held for sale |  | 0 | 0 |  |
Other liabilities |  | 5,897 | 5,638 |  |
Total Liabilities |  | 588,524 | 599,375 |  |
Redeemable non-controlling interest in Consolidated VIEs |  | 0 | 0 |  |
Non-controlling interest in Consolidated VIEs |  | 0 | 0 |  |
Net investment |  | 152,507 | 158,445 |  |
VIE, Primary Beneficiary | Consolidated Real Estate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 14,325 | 15,612 |  |
Real estate, net held in Consolidated VIEs |  | 1,005,161 | 979,934 |  |
Assets of disposal group held for sale |  | 146,363 | 426,017 |  |
Other assets |  | 31,679 | 37,035 |  |
Total Assets |  | 1,197,528 | 1,458,598 |  |
Multi-family CDOs, at fair value |  | 0 | 0 |  |
Mortgages payable on real estate, net in Consolidated VIEs |  | 850,743 | 784,421 |  |
Liabilities of disposal group held for sale |  | 122,318 | 386,024 |  |
Other liabilities |  | 15,163 | 21,797 |  |
Total Liabilities |  | 988,224 | 1,192,242 |  |
Redeemable non-controlling interest in Consolidated VIEs |  | 20,128 | 28,061 |  |
Non-controlling interest in Consolidated VIEs |  | 13,825 | 20,328 |  |
Net investment |  | 175,351 | 217,967 |  |
VIE, Primary Beneficiary | Residential loan securitizations at amortized cost, net |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 1,108,594 | 1,276,780 |  |
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 1,079,768 | 593,737 |  |
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 |  | 2,462,376 | 2,256,768 |  |
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 |  | 1,724,250 | 1,501,908 |  |
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 |  | 738,126 | 754,860 |  |
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 condensed 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 March 31, 2024 and December 31, 2023, assets of consolidated VIEs totaled $3,829,183 and $3,816,777, respectively, and the liabilities of consolidated VIEs totaled $3,192,392 and $3,076,818, respectively. See Note 7 for further discussion.

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