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Commitments and Contingencies - Contractual Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Agency Business Commitments
Cash collateral	$ 922,531	$ 569,928	$ 922,531	$ 569,928	$ 486,690	$ 197,470
Debt Obligations
2022 (three months ending December 31, 2022)	1,267,183		1,267,183
2023	2,152,200		2,152,200
2024	3,463,405		3,463,405
2025	2,098,991		2,098,991
2026	4,481,821		4,481,821
2027	633,633		633,633
Thereafter	358,701		358,701
Total	14,455,934		14,455,934
Minimum Annual Operating Lease Payments
2022 (three months ending December 31, 2022)	2,044		2,044
2023	8,914		8,914
2024	8,876		8,876
2025	9,003		9,003
2026	9,038		9,038
2027	7,597		7,597
Thereafter	27,706		27,706
Total	73,178		73,178
Total
2022 (three months ending December 31, 2022)	1,269,227		1,269,227
2023	2,161,114		2,161,114
2024	3,472,281		3,472,281
2025	2,107,994		2,107,994
2026	4,490,859		4,490,859
2027	641,230		641,230
Thereafter	386,407		386,407
Total	14,529,112		14,529,112
Operating lease expense	2,400	$ 2,400	7,200	$ 7,000
Unfunded CLO Commitments
Unfunded commitments related to structured loans and investments	1,250,000		1,250,000		$ 975,200
Fannie Mae Mortgage
Agency Business Commitments
Minimum liquid assets to be maintained to meet operational liquidity requirements	18,100		$ 18,100
Period of funding for collateral requirement			48 months
Forward Contracts
Agency Business Commitments
Period of contractual commitment			60 days
Restricted liquidity arrangement - loans sold under the Fannie Mae DUS program \| Fannie Mae Mortgage
Agency Business Commitments
Letter of credit assigned	45,000		$ 45,000
Cash collateral	18,900		18,900
Reserve required to fund additional restricted liquidity over the next 48 months	37,600		$ 37,600
Period of additional funding for collateral requirement			48 months
Cash collateral arrangement - purchase and loss obligations under Freddie Mac's SBL Program
Agency Business Commitments
Cash collateral per securitization	5,000		$ 5,000
Outstanding letters of credit	$ 5,000		$ 5,000