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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	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financial Assets:
Cash and cash equivalents	$ 408,785	$ 293,183	$ 649,822
Investment securities available for sale:	140,597	311,284
Equity Investments, carrying value	255,014	259,095
Financial Liabilities
Subordinated debentures, carrying value	45,000	45,000
Convertible notes, carrying value	137,240	135,327
Senior unsecured notes, carrying value	96,540	0
Mortgages payable on operating real estate, carrying value	486,786
Residential collateralized debt obligations
Financial Liabilities
Collateralized debt, carrying value	710,102	569,323
Residential Collateralized Debt Obligations, at Fair Value
Financial Liabilities
Collateralized debt, carrying value	904,976	1,054,335
Level 1
Financial Assets:
Cash and cash equivalents	408,785	293,183
Cash and cash equivalents, estimated fair value	408,785	293,183
Level 2
Financial Assets:
Investment securities available for sale:	448,093	724,726
Financial Liabilities
Convertible notes, carrying value	137,240	135,327
Convertible notes, estimated fair value	139,474	137,716
Senior unsecured notes, carrying value	96,540	0
Senior unsecured notes, estimated fair value	104,794	0
Level 2 | Portfolio Investments
Financial Liabilities
Outstanding repurchase agreements	334,556	405,531
Level 2 | Non-Agency RMBS Re-Securitization
Financial Liabilities
Collateralized debt, carrying value	0	15,256
Secured debt, estimated fair value	0	15,472
Level 3
Financial Assets:
Equity Investments, carrying value	255,014	259,095
Equity Investment, estimated fair value	255,014	259,095
Financial Liabilities
Subordinated debentures, carrying value	45,000	45,000
Subordinated debentures, estimated fair value	44,188	36,871
Level 3 | Mortgage Note
Financial Liabilities
Mortgages payable on operating real estate, carrying value	200,720	36,752
Mortgages payable on operating real estate, estimated fair value	200,720	36,752
Level 3 | Residential collateralized debt obligations
Financial Liabilities
Collateralized debt, carrying value	710,102	554,067
Secured debt, estimated fair value	714,176	561,329
Level 3 | Residential Collateralized Debt Obligations, at Fair Value
Financial Liabilities
Collateralized debt, carrying value	904,976	1,054,335
Secured debt, estimated fair value	904,976	1,054,335
Level 3 | Residential loans
Financial Assets:
Residential loans	3,273,807	3,049,166
Residential mortgage loans, estimated fair value	3,273,807	3,049,166
Level 3 | Multi-family loans
Financial Assets:
Preferred equity and mezzanine loan investments, carrying value	119,812	163,593
Preferred equity and mezzanine loan investments, estimated fair value	$ 119,812	$ 163,593

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