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Fair Value of Financial Instruments - Carrying Value vs Fair Value (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Financial Assets:
Securities, at fair value	[1]	$ 333,364	$ 256,685
Restricted cash		159,898	99,751
Level 1 | Held at Carrying Value
Financial Assets:
Cash and cash equivalents		334,183	304,696
Restricted cash		159,898	99,751
Level 1 | Held at Fair Value
Financial Assets:
Cash and cash equivalents		334,183	304,696
Restricted cash		159,898	99,751
Level 2 | Held at Carrying Value
Financial Assets:
Securities, at fair value		333,364	256,685
Financial Liabilities:
Securitized debt		3,357,590	2,650,473
Convertible senior notes		227,845	226,470
Level 2 | Held at Fair Value
Financial Assets:
Securities, at fair value		333,364	256,685
Financial Liabilities:
Securitized debt		3,217,905	2,646,203
Convertible senior notes		211,015	239,292
Residential whole loans, at fair value | Level 2 | Held at Carrying Value
Financial Assets:
Residential whole loans		51,094	1,082,765
Residential whole loans, at fair value | Level 2 | Held at Fair Value
Financial Assets:
Residential whole loans		51,094	1,082,765
Residential whole loans, at fair value | Level 3 | Held at Carrying Value
Financial Assets:
Residential whole loans		7,467,645	6,830,235
Residential whole loans, at fair value | Level 3 | Held at Fair Value
Financial Assets:
Residential whole loans		7,397,421	6,983,686
Agreements with non-mark-to-market collateral provisions | Level 3 | Held at Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		1,003,604	939,540
Agreements with non-mark-to-market collateral provisions | Level 3 | Held at Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		1,004,260	940,257
Agreements with mark-to-market collateral provisions | Level 3 | Held at Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		2,111,396	2,403,151
Agreements with mark-to-market collateral provisions | Level 3 | Held at Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		2,111,647	2,403,724
Financing agreements with mark-to-market collateral provisions | Level 2 | Held at Carrying Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		111,651	159,148
Financing agreements with mark-to-market collateral provisions | Level 2 | Held at Fair Value
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		$ 111,651	159,148
Agency eligible investor loans | Level 2 | Held at Fair Value
Financial Assets:
Residential whole loans			$ 654,700
[1] See Note 6 for information regarding the Company’s pledged assets.

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