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Fair Value of Financial Instruments - Carrying Value vs Fair Value (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Apr. 17, 2024	Jan. 31, 2024	Jan. 11, 2024	Dec. 31, 2023
Financial Assets:
Fair Value	[1]	$ 1,140,036				$ 746,090
Restricted cash		$ 197,348				170,211
8.875% Senior Notes Due 2029 | Senior Notes
Financial Liabilities:
Stated interest rate (as a percent)		8.875%		8.875%	8.875%
9.00% Senior Notes Due 2029 | Senior Notes
Financial Liabilities:
Stated interest rate (as a percent)		9.00%	9.00%
Carrying Value | Level 2
Financial Assets:
Fair Value		$ 1,140,036				746,090
Financial Liabilities:
Securitized debt		5,288,997				4,750,805
Convertible senior notes		0				208,989
Carrying Value | Level 2 | 8.875% Senior Notes Due 2029
Financial Liabilities:
Senior notes		111,089				0
Carrying Value | Level 2 | 9.00% Senior Notes Due 2029
Financial Liabilities:
Senior notes		72,280				0
Carrying Value | Level 1
Financial Assets:
Cash and cash equivalents		305,560				318,000
Restricted cash		197,348				170,211
Estimated Fair Value | Level 2
Financial Assets:
Fair Value		1,140,036				746,090
Financial Liabilities:
Securitized debt		5,224,736				4,655,195
Convertible senior notes		0				209,065
Estimated Fair Value | Level 2 | 8.875% Senior Notes Due 2029
Financial Liabilities:
Senior notes		116,042				0
Estimated Fair Value | Level 2 | 9.00% Senior Notes Due 2029
Financial Liabilities:
Senior notes		76,598				0
Estimated Fair Value | Level 1
Financial Assets:
Cash and cash equivalents		305,560				318,000
Restricted cash		197,348				170,211
Residential whole loan
Financial Assets:
Securities, at fair value		7,674,741				7,511,508
Residential whole loan | Level 3
Financial Assets:
Securities, at fair value		7,618,832				7,455,729
Residential whole loan | Level 2
Financial Assets:
Securities, at fair value		55,909				55,779
Residential whole loan | Level 1
Financial Assets:
Securities, at fair value		0				0
Residential whole loan | Carrying Value | Level 3
Financial Assets:
Securities, at fair value		8,971,462				8,985,513
Residential whole loan | Carrying Value | Level 2
Financial Assets:
Securities, at fair value		55,909				55,779
Residential whole loan | Estimated Fair Value | Level 3
Financial Assets:
Securities, at fair value		8,978,119				8,949,859
Residential whole loan | Estimated Fair Value | Level 2
Financial Assets:
Securities, at fair value		55,909				55,779
Securities, at fair value
Financial Assets:
Securities, at fair value		1,140,036				746,090
Securities, at fair value | Level 3
Financial Assets:
Securities, at fair value		0				0
Securities, at fair value | Level 2
Financial Assets:
Securities, at fair value		1,140,036				746,090
Securities, at fair value | Level 1
Financial Assets:
Securities, at fair value		0				0
Financing agreements with non-mark-to-market collateral provisions | Carrying Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		678,026				1,216,697
Financing agreements with non-mark-to-market collateral provisions | Estimated Fair Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		678,658				1,217,671
Agreements with mark-to-market collateral provisions | Carrying Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		1,853,638				1,737,652
Agreements with mark-to-market collateral provisions | Estimated Fair Value | Level 3
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		1,854,454				1,738,543
Financing agreements with mark-to-market collateral provisions | Carrying Value | Level 2
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		918,472				622,603
Financing agreements with mark-to-market collateral provisions | Estimated Fair Value | Level 2
Financial Liabilities:
Financing agreements with mark-to-market collateral provisions		$ 918,472				$ 622,603
[1] See Note 6 for information regarding the Company’s pledged assets.

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