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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	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Financial Assets:
Cash and cash equivalents	$ 303,762	$ 289,602	$ 290,977
Investment securities available for sale:	25,073	29,520
Equity Investments, carrying value	225,300	239,631
Financial Liabilities:
Subordinated debentures, carrying value	45,000	45,000
Convertible notes, carrying value	0	137,898
Senior unsecured notes, carrying value	96,870	96,704
Mortgages payable on operating real estate, carrying value	1,247,179
Residential collateralized debt obligations
Financial Liabilities:
Collateralized debt, carrying value	1,143,855	682,802
Consolidated SLST CDOs
Financial Liabilities:
Collateralized debt, carrying value	754,264	839,419
Level 1
Financial Assets:
Cash and cash equivalents	303,762	289,602
Cash and cash equivalents, estimated fair value	303,762	289,602
Level 2
Financial Assets:
Investment securities available for sale:	145,780	200,844
Financial Liabilities:
Convertible notes, carrying value	0	137,898
Convertible notes, estimated fair value	0	138,011
Senior unsecured notes, carrying value	96,870	96,704
Senior unsecured notes, estimated fair value	97,246	102,215
Level 2 | Portfolio Investments
Financial Liabilities:
Outstanding repurchase agreements	927,049	554,259
Level 3
Financial Assets:
Equity Investments, carrying value	225,300	239,631
Equity Investment, estimated fair value	225,300	239,631
Financial Liabilities:
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	44,448	44,388
Level 3 | Mortgage Note
Financial Liabilities:
Mortgages payable on operating real estate, carrying value	1,083,371	709,356
Mortgages payable on operating real estate, estimated fair value	1,079,742	712,112
Level 3 | Residential collateralized debt obligations
Financial Liabilities:
Collateralized debt, carrying value	1,143,855	682,802
Secured debt, estimated fair value	1,110,428	686,027
Level 3 | Consolidated SLST CDOs
Financial Liabilities:
Collateralized debt, carrying value	754,264	839,419
Secured debt, estimated fair value	754,264	839,419
Level 3 | Residential loans
Financial Assets:
Residential loans	3,953,427	3,575,601
Residential mortgage loans, estimated fair value	3,953,427	3,575,601
Level 3 | Multi-family loans
Financial Assets:
Preferred equity and mezzanine loan investments, carrying value	110,208	120,021
Preferred equity and mezzanine loan investments, estimated fair value	$ 110,208	$ 120,021

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