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Commitments and Contingencies - Contractual Commitments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Agency Business Commitments
Cash collateral per securitization	$ 5,000
Outstanding letters of credit	5,000
Debt Obligations
2025 (nine months ending December 31, 2025)	3,204,089
2026	3,988,891
2027	1,250,044
2028	1,297,027
2029	0
2030	0
Thereafter	154,336
Total	9,894,387
Minimum Annual Operating Lease Payments
2025 (nine months ending December 31, 2025)	8,370
2026	11,425
2027	9,913
2028	9,228
2029	8,714
2030	8,756
Thereafter	10,924
Total	67,330
Total
2025 (nine months ending December 31, 2025)	3,212,459
2026	4,000,316
2027	1,259,957
2028	1,306,255
2029	8,714
2030	8,756
Thereafter	165,260
Total	9,961,717
Operating lease expense	2,800	$ 2,600
Land
Total
Outstanding unfunded commitments	2,170,000		$ 2,200,000
Fannie Mae Mortgage
Agency Business Commitments
Minimum liquid assets to be maintained to meet operational liquidity requirements	$ 22,400
Period of funding for collateral requirement	48 months
Letter of credit required	$ 94,000
Letter of credit assigned	70,000
Reserve required to fund additional restricted liquidity over the next 48 months	$ 32,500
Period of additional funding for collateral requirement	48 months
Forward Contracts
Agency Business Commitments
Period of contractual commitment	60 days