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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of the Company's Financial Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financial Assets:
Cash and cash equivalents	$ 244,718	$ 289,602	$ 293,183
Equity investments	179,746	239,631
Equity investments in disposal group held for sale, carrying value	9,010
Collateralized Debt Obligations [Abstract]
Subordinated debentures	45,000	45,000
Convertible notes	0	137,898
Senior unsecured notes	97,384	$ 96,704
Mortgages payable on real estate	$ 542,453
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Residential loan securitizations at amortized cost, net
Collateralized Debt Obligations [Abstract]
Collateralized debt obligations	$ 1,468,222	$ 682,802
Residential loan securitizations at amortized cost, net | VIE, Primary Beneficiary
Collateralized Debt Obligations [Abstract]
Collateralized debt obligations	1,468,222	682,802
Consolidated SLST CDOs | VIE, Primary Beneficiary
Collateralized Debt Obligations [Abstract]
Collateralized debt obligations	634,495	839,419
Level 1
Financial Assets:
Cash and cash equivalents	244,718	289,602
Cash and cash equivalents, estimated fair value	244,718	289,602
Level 3
Financial Assets:
Equity investments	179,746	239,631
Equity investments, estimated fair value	179,746	239,631
Equity investments in disposal group held for sale, carrying value	9,010	0
Equity investments in disposal group held for sale, estimated fair value	9,010	0
Collateralized Debt Obligations [Abstract]
Subordinated debentures	45,000	45,000
Subordinated debentures, fair value	32,721	44,388
Level 3 | Mortgages
Collateralized Debt Obligations [Abstract]
Mortgages payable on real estate	394,707	709,356
Mortgages payable on operating real estate, fair value	377,327	712,112
Mortgages payable on real estate in disposal group held for sale, carrying value	865,414	0
Mortgages payable on real estate in disposal group held for sale, estimated fair value	864,758	0
Level 3 | Residential loan securitizations at amortized cost, net
Collateralized Debt Obligations [Abstract]
Collateralized debt obligations	1,468,222	682,802
Collateralized debt obligations, fair value	1,383,715	686,027
Level 3 | Consolidated SLST CDOs | VIE, Primary Beneficiary
Collateralized Debt Obligations [Abstract]
Collateralized debt obligations	634,495	839,419
Collateralized debt obligations, fair value	634,495	839,419
Level 3 | Residential loans
Financial Assets:
Residential loans, carrying value	3,525,080	3,575,601
Residential mortgage loans at fair value	3,525,080	3,575,601
Level 3 | Multi-family loans
Financial Assets:
Preferred equity and mezzanine loan investments	87,534	120,021
Preferred equity and mezzanine loan investments, estimated fair value	87,534	120,021
Level 2
Financial Assets:
Investment securities, available for sale	99,559	200,844
Derivative asset, carrying value	2,473	0
Derivative asset, estimated fair value	2,473	0
Derivative assets in disposal group held for sale, carrying value	29,418	0
Derivative assets in disposal group held for sale, estimated fair value	29,418	0
Collateralized Debt Obligations [Abstract]
Convertible notes	0	137,898
Convertible debt, fair value	0	138,011
Senior unsecured notes	97,384	96,704
Senior unsecured notes, fair value	91,104	102,215
Level 2 | Repurchase agreements
Financial Liabilities:
Repurchase agreements	$ 737,023	$ 554,259

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