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Debt Obligations - Credit and Repurchase Facilities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Feb. 29, 2024	Jan. 31, 2024
Debt Obligations
Debt Carrying Value	$ 2,913,483	$ 3,237,827
Collateral Carrying Value	$ 4,143,426	4,606,657
Wtd. Avg. Note Rate	7.72%
Outstanding principal balance repaid	$ 36,700
Structured Business
Debt Obligations
Debt Carrying Value	2,601,520	2,824,501
Collateral Carrying Value	$ 3,826,513	4,062,162
Wtd. Avg. Note Rate	7.84%
Deferred financing fees	$ 7,400	4,800
Structured Business | B Piece bonds
Debt Obligations
Outstanding principal balance repaid		43,100
Structured Business | $2.5B joint repurchase facility
Debt Obligations
Maximum borrowing capacity	1,900,000
Debt Carrying Value	783,102	868,077
Collateral Carrying Value	$ 1,268,862	1,371,436
Wtd. Avg. Note Rate	7.79%
Structured Business | $1B repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 1,000,000
Debt Carrying Value	346,099	385,779
Collateral Carrying Value	$ 537,148	589,533
Wtd. Avg. Note Rate	7.85%
Structured Business | $1B repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 1,000,000
Debt Carrying Value	440,959	447,490
Collateral Carrying Value	$ 588,623	597,205
Wtd. Avg. Note Rate	8.39%
Structured Business | $499M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 499,000
Debt Carrying Value	396,650	355,328
Collateral Carrying Value	$ 565,610	506,753
Wtd. Avg. Note Rate	7.81%
Structured Business | $350M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 350,000
Debt Carrying Value	151,448	262,820
Collateral Carrying Value	$ 228,535	362,465
Wtd. Avg. Note Rate	7.54%
Structured Business | $250M credit facility
Debt Obligations
Maximum borrowing capacity	$ 250,000
Debt Carrying Value	18,166	0
Collateral Carrying Value	$ 36,470	0
Wtd. Avg. Note Rate	8.71%
Structured Business | $250M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 250,000
Debt Carrying Value	13,903	17,964
Collateral Carrying Value	$ 23,088	23,088
Wtd. Avg. Note Rate	7.29%
Structured Business | $250M credit facility
Debt Obligations
Maximum borrowing capacity	$ 250,000
Debt Carrying Value	0	0
Collateral Carrying Value	$ 0	0
Wtd. Avg. Note Rate	0.00%
Structured Business | $200M credit facility
Debt Obligations
Maximum borrowing capacity				$ 200,000
Debt Carrying Value	$ 8,818	32,579
Collateral Carrying Value	$ 13,692	41,522
Wtd. Avg. Note Rate	7.13%
Structured Business | $200M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 200,000
Debt Carrying Value	58,464	45,969
Collateral Carrying Value	$ 92,615	68,762
Wtd. Avg. Note Rate	8.00%
Structured Business | $200M repurchase facility
Debt Obligations
Maximum borrowing capacity				$ 200,000
Debt Carrying Value	$ 106,950	107,324
Collateral Carrying Value	$ 141,130	141,130
Wtd. Avg. Note Rate	7.40%
Structured Business | $150M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 150,000
Debt Carrying Value	91,858	120,610
Collateral Carrying Value	$ 124,003	162,068
Wtd. Avg. Note Rate	8.46%
Structured Business | $126M loan specific credit facilities
Debt Obligations
Maximum borrowing capacity			$ 126,000
Debt Carrying Value	$ 125,819	120,328
Collateral Carrying Value	$ 170,237	161,700
Wtd. Avg. Note Rate	6.77%
Structured Business | $50M credit facility
Debt Obligations
Maximum borrowing capacity	$ 50,000
Debt Carrying Value	29,200	29,200
Collateral Carrying Value	$ 36,500	36,500
Wtd. Avg. Note Rate	7.54%
Structured Business | $40M credit facility
Debt Obligations
Maximum borrowing capacity	$ 40,000
Debt Carrying Value	0	0
Collateral Carrying Value	$ 0	0
Wtd. Avg. Note Rate	0.00%
Structured Business | $35M working capital facility
Debt Obligations
Maximum borrowing capacity	$ 35,000
Debt Carrying Value	0	0
Collateral Carrying Value	$ 0	0
Wtd. Avg. Note Rate	0.00%
Structured Business | Repurchase facility - securities
Debt Obligations
Debt Carrying Value	$ 30,084	31,033
Collateral Carrying Value	$ 0	0
Wtd. Avg. Note Rate	7.12%
Structured Business | $500M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 500,000
Agency Business
Debt Obligations
Debt Carrying Value	311,963	413,326
Collateral Carrying Value	$ 316,913	544,495
Wtd. Avg. Note Rate	6.71%
Deferred financing fees	$ 300	300
Agency Business | $50M credit facility
Debt Obligations
Maximum borrowing capacity	50,000
Debt Carrying Value	25,055	29,083
Collateral Carrying Value	$ 25,080	29,418
Wtd. Avg. Note Rate	6.69%
Agency Business | $750M ASAP agreement
Debt Obligations
Maximum borrowing capacity	$ 750,000
Debt Carrying Value	83,866	73,011
Collateral Carrying Value	$ 83,961	73,781
Wtd. Avg. Note Rate	6.47%
Agency Business | $500M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 500,000
Debt Carrying Value	64,632	115,730
Collateral Carrying Value	$ 65,065	241,895
Wtd. Avg. Note Rate	6.81%
Agency Business | $200M credit facility
Debt Obligations
Maximum borrowing capacity	$ 200,000
Debt Carrying Value	129,967	187,138
Collateral Carrying Value	$ 130,604	187,185
Wtd. Avg. Note Rate	6.74%
Agency Business | $100M joint repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 100,000
Debt Carrying Value	7,912	7,833
Collateral Carrying Value	$ 11,350	11,350
Wtd. Avg. Note Rate	7.74%
Agency Business | $100M credit facility
Debt Obligations
Maximum borrowing capacity	$ 100,000
Debt Carrying Value	0	0
Collateral Carrying Value	$ 0	0
Wtd. Avg. Note Rate	0.00%
Agency Business | $1M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 1,000
Debt Carrying Value	531	531
Collateral Carrying Value	$ 853	$ 866
Wtd. Avg. Note Rate	7.79%
Structured and Agency Business | $3 Billion joint repurchase facility
Debt Obligations
Maximum borrowing capacity			$ 3,000,000
Structured and Agency Business | $2 Billion joint repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 2,000,000

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