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Debt Obligations - Credit and Repurchase Facilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Jun. 30, 2024	Apr. 30, 2024	Mar. 31, 2024	Feb. 29, 2024
Debt Obligations
Debt Carrying Value	$ 3,257,719	$ 3,237,827
Collateral Carrying Value	$ 4,647,278	4,606,657
Wtd. Avg. Note Rate	7.38%
Outstanding principal balance repaid	$ 31,400	43,100
Structured Business
Debt Obligations
Debt Carrying Value	2,938,300	2,824,501
Collateral Carrying Value	$ 4,323,145	4,062,162
Wtd. Avg. Note Rate	7.49%
Deferred financing fees	$ 6,100	4,800
Structured Business | $1.9B joint repurchase facility
Debt Obligations
Maximum borrowing capacity	1,900,000
Debt Carrying Value	692,187	868,077
Collateral Carrying Value	$ 1,131,634	1,371,436
Wtd. Avg. Note Rate	7.36%
Structured Business | $1B repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 1,000,000
Debt Carrying Value	164,403	385,779
Collateral Carrying Value	$ 262,020	589,533
Wtd. Avg. Note Rate	7.43%
Structured Business | $1B repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 1,000,000				$ 1,000,000
Debt Carrying Value	749,244	447,490
Collateral Carrying Value	$ 1,011,816	597,205
Wtd. Avg. Note Rate	7.51%
Expiration period after the lender provides written notice	6 months
Line of credit facility, repurchase period	6 months
Structured Business | $649M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 649,000
Debt Carrying Value	490,019	355,328
Collateral Carrying Value	$ 667,585	506,753
Wtd. Avg. Note Rate	7.44%
Structured Business | $400M credit facility
Debt Obligations
Maximum borrowing capacity	$ 400,000
Debt Carrying Value	131,818	0
Collateral Carrying Value	$ 198,666	0
Wtd. Avg. Note Rate	8.21%
Structured Business | $350M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 350,000				$ 350,000
Debt Carrying Value	134,009	262,820
Collateral Carrying Value	$ 203,135	362,465
Wtd. Avg. Note Rate	7.05%
Length of extension option					1 year
Structured Business | $250M credit facility
Debt Obligations
Maximum borrowing capacity	$ 250,000				$ 250,000
Debt Carrying Value	140,842	0
Collateral Carrying Value	$ 271,985	0
Wtd. Avg. Note Rate	8.21%
Length of extension option	1 year				1 year
Structured Business | $250M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 250,000
Debt Carrying Value	0	0
Collateral Carrying Value	$ 0	0
Wtd. Avg. Note Rate	0.00%
Length of extension option	1 year
Structured Business | $250M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 250,000
Debt Carrying Value	0	17,964
Collateral Carrying Value	$ 0	23,088
Wtd. Avg. Note Rate	0.00%
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 repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 200,000
Debt Carrying Value	110,095	45,969
Collateral Carrying Value	$ 154,402	68,762
Wtd. Avg. Note Rate	7.50%
Structured Business | $200M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 200,000
Debt Carrying Value	62,253	107,324
Collateral Carrying Value	$ 92,634	141,130
Wtd. Avg. Note Rate	6.89%
Structured Business | $150M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 150,000
Debt Carrying Value	82,801	120,610
Collateral Carrying Value	$ 110,694	162,068
Wtd. Avg. Note Rate	7.95%
Structured Business | $143M loan specific credit facilities
Debt Obligations
Maximum borrowing capacity	$ 143,000
Debt Carrying Value	143,117	120,328
Collateral Carrying Value	$ 193,964	161,700
Wtd. Avg. Note Rate	7.39%
Structured Business | $100M credit facility
Debt Obligations
Maximum borrowing capacity	$ 100,000			$ 100,000
Debt Carrying Value	0	32,579
Collateral Carrying Value	$ 0	41,522
Wtd. Avg. Note Rate	0.00%
Structured Business | $50M credit facility
Debt Obligations
Maximum borrowing capacity	$ 50,000
Debt Carrying Value	0	29,200
Collateral Carrying Value	$ 0	36,500
Wtd. Avg. Note Rate	0.00%
Structured Business | $40M credit facility
Debt Obligations
Maximum borrowing capacity	$ 40,000
Debt Carrying Value	15,550	0
Collateral Carrying Value	$ 24,610	0
Wtd. Avg. Note Rate	7.30%
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	$ 21,962	31,033
Collateral Carrying Value	$ 0	0
Wtd. Avg. Note Rate	6.64%
Structured Business | $500M repurchase facility
Debt Obligations
Maximum borrowing capacity						$ 500,000
Structured Business | $200M credit facility
Debt Obligations
Maximum borrowing capacity					$ 200,000
Agency Business
Debt Obligations
Debt Carrying Value	$ 319,419	413,326
Collateral Carrying Value	$ 324,133	544,495
Wtd. Avg. Note Rate	6.37%
Deferred financing fees	$ 200	300
Agency Business | $100M credit facility
Debt Obligations
Maximum borrowing capacity	100,000
Debt Carrying Value	17,514	0
Collateral Carrying Value	$ 17,550	0
Wtd. Avg. Note Rate	6.31%
Agency Business | $50M credit facility
Debt Obligations
Maximum borrowing capacity	$ 50,000
Debt Carrying Value	5,245	29,083
Collateral Carrying Value	$ 5,245	29,418
Wtd. Avg. Note Rate	6.31%
Agency Business | $750M ASAP agreement
Debt Obligations
Maximum borrowing capacity	$ 750,000
Debt Carrying Value	17,445	73,011
Collateral Carrying Value	$ 17,474	73,781
Wtd. Avg. Note Rate	6.31%
Agency Business | $500M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 500,000		$ 500,000
Debt Carrying Value	197,646	115,730
Collateral Carrying Value	$ 198,148	241,895
Wtd. Avg. Note Rate	6.33%
Agency Business | $200M credit facility
Debt Obligations
Maximum borrowing capacity	$ 200,000
Debt Carrying Value	73,315	187,138
Collateral Carrying Value	$ 73,563	187,185
Wtd. Avg. Note Rate	6.36%
Agency Business | $100M joint repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 100,000
Debt Carrying Value	7,921	7,833
Collateral Carrying Value	$ 11,329	11,350
Wtd. Avg. Note Rate	7.58%
Agency Business | $1M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 1,000
Debt Carrying Value	333	531
Collateral Carrying Value	$ 824	$ 866
Wtd. Avg. Note Rate	7.30%
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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