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Financing Agreements - Financing Agreements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Jan. 31, 2024	Jan. 11, 2024
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 8,984,209	$ 8,683,152
Fair Value / Carrying Value	$ 8,922,502	$ 8,536,745
Weighted Average Cost of Funding (in Percent)	4.54%	4.33%
Wells Fargo
Financing Agreements [Line Items]
Weighted Average Months to Maturity	10 months 3 days
Barclays
Financing Agreements [Line Items]
Weighted Average Months to Maturity	6 months 27 days
Senior Notes | 8.875% Senior Notes Due 2029
Financing Agreements [Line Items]
Stated interest rate (as a percent)	8.875%		8.875%	8.875%
Agreements with mark-to-market collateral provisions
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 2,772,926	$ 2,361,146
Fair Value / Carrying Value	$ 2,772,110	$ 2,360,254
Weighted Average Cost of Funding (in Percent)	6.85%	7.09%
Agreements with mark-to-market collateral provisions | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 1,441,614
Agreements with mark-to-market collateral provisions | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	205,389
Agreements with mark-to-market collateral provisions | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	422,481
Fair Value / Carrying Value	$ 454,900
Extension period	1 year
Agreements with mark-to-market collateral provisions | 6-12 Months | Maximum
Financing Agreements [Line Items]
Extension period	24 months
Agreements with mark-to-market collateral provisions | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 703,442
Fair Value / Carrying Value	1,300,000
Agreements with mark-to-market collateral provisions | Estimated Fair Value
Financing Agreements [Line Items]
Financing agreements, amortized cost	194,100	$ 469,400
Agreements with mark-to-market collateral provisions | Estimated Fair Value | Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value		469,400
Agreements with mark-to-market collateral provisions | Residential whole loan
Financing Agreements [Line Items]
Unpaid Principal Balance	1,854,454	1,738,543
Fair Value / Carrying Value	$ 1,853,638	$ 1,737,651
Weighted Average Cost of Funding (in Percent)	7.37%	7.50%
Weighted Average Term to Maturity (Months)	10 months 27 days	11 months 24 days
Agreements with mark-to-market collateral provisions | Residential whole loan | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 523,142
Agreements with mark-to-market collateral provisions | Residential whole loan | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	205,389
Agreements with mark-to-market collateral provisions | Residential whole loan | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	422,481
Agreements with mark-to-market collateral provisions | Residential whole loan | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	703,442
Agreements with mark-to-market collateral provisions | Residential whole loan | Not Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value	194,100
Agreements with mark-to-market collateral provisions | Securities
Financing Agreements [Line Items]
Unpaid Principal Balance	918,472	$ 622,603
Fair Value / Carrying Value	$ 918,472	$ 622,603
Weighted Average Cost of Funding (in Percent)	5.65%	5.81%
Weighted Average Term to Maturity (Months)	9 days	6 days
Agreements with mark-to-market collateral provisions | Securities | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 918,472
Agreements with mark-to-market collateral provisions | Securities | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	0
Agreements with mark-to-market collateral provisions | Securities | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	0
Agreements with mark-to-market collateral provisions | Securities | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	0
Agreements with Non-mark-to-market Collateral Provisions | Estimated Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value		$ 178,900
Financing agreements, amortized cost	222,300	178,900
Agreements with Non-mark-to-market Collateral Provisions | Residential whole loan
Financing Agreements [Line Items]
Unpaid Principal Balance	678,658	1,217,671
Fair Value / Carrying Value	$ 678,026	$ 1,216,697
Weighted Average Cost of Funding (in Percent)	7.95%	7.94%
Weighted Average Term to Maturity (Months)	11 months 15 days	20 months 18 days
Agreements with Non-mark-to-market Collateral Provisions | Residential whole loan | 0-3 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 78,040
Agreements with Non-mark-to-market Collateral Provisions | Residential whole loan | 3-6 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	0
Agreements with Non-mark-to-market Collateral Provisions | Residential whole loan | 6-12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	378,355
Agreements with Non-mark-to-market Collateral Provisions | Residential whole loan | Greater than 12 Months
Financing Agreements [Line Items]
Unpaid Principal Balance	222,263
Agreements with Non-mark-to-market Collateral Provisions | Residential whole loan | Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value	$ 222,300
Securities | Estimated Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value		$ 4,000,000
Weighted Average Cost of Funding (in Percent)	(1.31%)	(1.40%)
Financing agreements, amortized cost	$ 4,700,000	$ 4,100,000
Securities | Residential whole loan
Financing Agreements [Line Items]
Unpaid Principal Balance	5,342,625	4,894,746
Fair Value / Carrying Value	$ 5,288,997	$ 4,750,805
Weighted Average Cost of Funding (in Percent)	4.88%	4.37%
Securities | Residential whole loan | Held at Fair Value
Financing Agreements [Line Items]
Fair Value / Carrying Value	$ 4,700,000
Convertible senior notes | Unsecured
Financing Agreements [Line Items]
Unpaid Principal Balance	0	$ 209,589
Fair Value / Carrying Value	$ 0	$ 208,989
Weighted Average Cost of Funding (in Percent)	0.00%	6.94%
Weighted Average Term to Maturity (Months)	0 months	5 months 15 days
8.875% Senior Notes Due 2029 | Unsecured
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 115,000
Fair Value / Carrying Value	$ 111,089
Weighted Average Cost of Funding (in Percent)	9.83%
Weighted Average Term to Maturity (Months)	52 months 18 days
9.00% Senior Notes Due 2029 | Unsecured
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 75,000
Fair Value / Carrying Value	$ 72,280
Weighted Average Cost of Funding (in Percent)	9.90%
Weighted Average Term to Maturity (Months)	58 months 15 days
Impact of net Swap carry | Unsecured
Financing Agreements [Line Items]
Weighted Average Cost of Funding (in Percent)	(1.31%)	(1.40%)

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