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Commitments and Contingencies - Contractual Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Agency Business Commitments [Line Items]
Cash collateral per securitization	$ 5,000
Outstanding letters of credit	5,000
Debt Obligations
2024	1,855,247
2025	2,523,024
2026	1,996,721
2027	4,510,642
2028	946,089
Thereafter	154,336
Net Carrying Value	11,986,059
Minimum Annual Operating Lease Payments
2024	10,820
2025	11,206
2026	11,297
2027	9,782
2028	9,064
Thereafter	27,755
Total	79,924
Total
2024	1,866,067
2025	2,534,230
2026	2,008,018
2027	4,520,424
2028	955,153
Thereafter	182,091
Total	$ 12,065,983
Operating Lease, Weighted average remaining lease term (in years)	7 years 7 months 6 days	8 years 2 months 12 days
Operating Lease, Weighted average discount rate (as a percent)	5.70%	6.80%
Operating lease expense	$ 10,900	$ 9,600	$ 9,300
Unfunded CLO Commitments
Unfunded commitments related to structured loans and investments	1,310,000	$ 1,150,000
Fannie Mae Mortgage
Agency Business Commitments [Line Items]
Minimum liquid assets to be maintained to meet operational liquidity requirements	$ 20,300
Period of funding for collateral requirement	48 months
Letter of credit required amount	$ 76,200
Letter of credit assigned	64,000
Reserve required to fund additional restricted liquidity over the next 48 months	$ 36,600
Period of additional funding for collateral requirement	48 months
Forward Contracts
Agency Business Commitments [Line Items]
Period of contractual commitment	60 days
Minimum
Total
Remaining lease term	9 months 18 days	2 months 12 days
Maximum
Total
Remaining lease term	10 years 1 month 6 days	10 years 4 months 24 days