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Fair Value of Financial Instruments - Carrying Value vs Fair Value (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Financial Assets:
Securities, at fair value	[1]	$ 504,639	$ 333,364
Restricted cash		165,137	159,898
Carrying Value | Level 1
Financial Assets:
Cash and cash equivalents		362,452	334,183
Restricted cash		165,137	159,898
Carrying Value | Level 2
Financial Assets:
Securities, at fair value		504,639	333,364
Financial Liabilities:
Securitized debt		3,830,309	3,357,590
Convertible senior notes		228,207	227,845
Estimated Fair Value | Level 1
Financial Assets:
Cash and cash equivalents		362,452	334,183
Restricted cash		165,137	159,898
Estimated Fair Value | Level 2
Financial Assets:
Securities, at fair value		504,639	333,364
Financial Liabilities:
Securitized debt		3,707,921	3,217,905
Convertible senior notes		216,190	211,015
Residential whole loans, at fair value | Carrying Value | Level 2
Financial Assets:
Residential whole loans		60,854	51,094
Residential whole loans, at fair value | Carrying Value | Level 3
Financial Assets:
Residential whole loans		7,733,396	7,467,645
Residential whole loans, at fair value | Estimated Fair Value | Level 2
Financial Assets:
Residential whole loans		60,854	51,094
Residential whole loans, at fair value | Estimated Fair Value | Level 3
Financial Assets:
Residential whole loans		7,699,538	7,397,421
Financing agreements with non-mark-to-market collateral provisions | Carrying Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		946,006	1,003,604
Financing agreements with non-mark-to-market collateral provisions | Estimated Fair Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		946,573	1,004,260
Agreements with mark-to-market collateral provisions | Carrying Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		1,691,769	2,111,396
Agreements with mark-to-market collateral provisions | Estimated Fair Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		1,692,254	2,111,647
Financing agreements with mark-to-market collateral provisions | Carrying Value | Level 2
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		405,027	111,651
Financing agreements with mark-to-market collateral provisions | Estimated Fair Value | Level 2
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		$ 405,027	$ 111,651
[1] See Note 6 for information regarding the Company’s pledged assets.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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