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Debt Obligations - Credit and Repurchase Facilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Debt Obligations
Collateral Carrying Value	$ 4,865,667	$ 5,185,293
Weighted Average Note Rate (as a percent)	7.06%
Debt Carrying Value	$ 3,650,876	3,841,814
Outstanding principal balance repaid	47,400
Repurchase facility - securities | B Piece bonds
Debt Obligations
Collateral Carrying Value		33,100
Structured Business
Debt Obligations
Collateral Carrying Value	4,427,306	4,845,753
Unamortized deferred financing fees	$ 11,100	$ 13,300
Weighted average note rate including certain fees and costs (as a percent)	7.57%	6.95%
Leverage on loans and investment portfolio financed through credit facilities and repurchase agreements, excluding securities repurchase facility, working capital line of credit and security agreement used to finance leasehold and capital expenditure improvements at corporate office (as a percent)	72.00%	73.00%
Weighted Average Note Rate (as a percent)	7.18%
Debt Carrying Value	$ 3,228,891	$ 3,536,371
Structured Business | $2.5B joint repurchase facility
Debt Obligations
Collateral Carrying Value	1,876,423	2,099,447
Maximum borrowing capacity	$ 2,500,000
Weighted Average Note Rate (as a percent)	7.26%
Debt Carrying Value	$ 1,336,305	1,516,657
Structured Business | $1B repurchase facility
Debt Obligations
Collateral Carrying Value	559,341	703,740
Maximum borrowing capacity	$ 1,000,000
Weighted Average Note Rate (as a percent)	6.97%
Debt Carrying Value	$ 391,056	498,666
Structured Business | $500M repurchase facility
Debt Obligations
Collateral Carrying Value	240,799	188,563
Maximum borrowing capacity	$ 500,000
Expiration period after the lender provides written notice	6 months
Additional period to repurchase the underlying loans	6 months
Weighted Average Note Rate (as a percent)	7.89%
Debt Carrying Value	$ 198,152	154,653
Structured Business | $499M repurchase facility
Debt Obligations
Maximum borrowing capacity	499,000
Structured Business | $450M repurchase facility
Debt Obligations
Collateral Carrying Value	419,485	450,736
Total committed amount	$ 450,000
Weighted Average Note Rate (as a percent)	7.03%
Debt Carrying Value	$ 319,106	344,237
Structured Business | $450M repurchase facility | SOFR
Debt Obligations
Variable rate, spread (as a percent)	2.00%
Structured Business | $450M repurchase facility
Debt Obligations
Collateral Carrying Value	$ 131,924	239,678
Maximum borrowing capacity	$ 450,000
Weighted Average Note Rate (as a percent)	6.57%
Debt Carrying Value	$ 102,470	186,639
Structured Business | $450M repurchase facility
Debt Obligations
Collateral Carrying Value	$ 487,321	504,506
Weighted Average Note Rate (as a percent)	7.22%
Debt Carrying Value	$ 339,819	351,056
Structured Business | $400M credit facility
Debt Obligations
Collateral Carrying Value	43,383	43,238
Maximum borrowing capacity	$ 400,000
Weighted Average Note Rate (as a percent)	6.83%
Debt Carrying Value	$ 33,232	33,221
Structured Business | $225M credit facility
Debt Obligations
Collateral Carrying Value	116,288	81,119
Maximum borrowing capacity	$ 225,000
Weighted Average Note Rate (as a percent)	7.52%
Debt Carrying Value	$ 64,877	47,398
Structured Business | $200M credit facility
Debt Obligations
Collateral Carrying Value	187,508	200,099
Maximum borrowing capacity	$ 200,000
Weighted Average Note Rate (as a percent)	6.92%
Debt Carrying Value	$ 147,948	154,516
Structured Business | $50M credit facility
Debt Obligations
Collateral Carrying Value	$ 36,500	36,500
Weighted Average Note Rate (as a percent)	7.07%
Debt Carrying Value	$ 29,199	29,194
Structured Business | $169M loan specific credit facilities
Debt Obligations
Collateral Carrying Value	238,458	225,805
Maximum borrowing capacity	$ 169,000
Weighted Average Note Rate (as a percent)	6.97%
Debt Carrying Value	$ 169,111	156,107
Structured Business | $25M credit facility
Debt Obligations
Collateral Carrying Value	24,475	24,572
Maximum borrowing capacity	$ 25,000
Weighted Average Note Rate (as a percent)	7.57%
Debt Carrying Value	$ 18,747	18,701
Structured Business | $25M credit facility.
Debt Obligations
Maximum borrowing capacity	$ 25,000
Structured Business | Repurchase facility - securities
Debt Obligations
Weighted Average Note Rate (as a percent)	6.59%
Debt Carrying Value	$ 33,100	12,832
Structured Business | $35M working capital facility
Debt Obligations
Maximum borrowing capacity	35,000
Structured Business | $200M credit facility
Debt Obligations
Collateral Carrying Value	65,401	47,750
Maximum borrowing capacity	$ 200,000
Weighted Average Note Rate (as a percent)	7.52%
Debt Carrying Value	$ 45,769	32,494
Structured Business | $50 million credit facility - two
Debt Obligations
Maximum borrowing capacity	50,000
Agency Business
Debt Obligations
Collateral Carrying Value	438,361	339,540
Unamortized deferred financing fees	$ 800	900
Weighted Average Note Rate (as a percent)	6.17%
Debt Carrying Value	$ 421,985	305,443
Agency Business | $500M repurchase facility
Debt Obligations
Collateral Carrying Value	$ 125,336	66,866
Weighted Average Note Rate (as a percent)	6.18%
Debt Carrying Value	$ 112,978	66,778
Agency Business | $200M credit facility
Debt Obligations
Collateral Carrying Value	167,681	33,177
Maximum borrowing capacity	200,000
Total committed amount	$ 200,000
Weighted Average Note Rate (as a percent)	6.27%
Debt Carrying Value	$ 167,480	31,475
Agency Business | $200M credit facility | SOFR
Debt Obligations
Variable rate, spread (as a percent)	1.40%
Agency Business | $50M credit facility
Debt Obligations
Collateral Carrying Value		14,671
Debt Carrying Value		14,664
Agency Business | $750M ASAP agreement
Debt Obligations
Collateral Carrying Value	$ 82,679	30,291
Maximum borrowing capacity	$ 750,000
Weighted Average Note Rate (as a percent)	5.78%
Debt Carrying Value	$ 82,581	29,476
Agency Business | $500M joint repurchase facility
Debt Obligations
Collateral Carrying Value	11,350	135,641
Maximum borrowing capacity	$ 500,000
Weighted Average Note Rate (as a percent)	7.03%
Debt Carrying Value	$ 8,047	104,629
Agency Business | $150M credit facility
Debt Obligations
Collateral Carrying Value	50,408	57,974
Maximum borrowing capacity	$ 150,000
Weighted Average Note Rate (as a percent)	6.33%
Debt Carrying Value	$ 50,365	57,887
Agency Business | $1M repurchase facility
Debt Obligations
Collateral Carrying Value	907	920
Maximum borrowing capacity	$ 1,000
Weighted Average Note Rate (as a percent)	7.18%
Debt Carrying Value	$ 534	$ 534
Agency Business | $50 million credit facility - one
Debt Obligations
Maximum borrowing capacity	50,000
Agency Business | $500.0 million credit facility
Debt Obligations
Maximum borrowing capacity	$ 500,000

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- Definition

Leverage capital divided by average loan and investment assets as defined in the agreements.

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The additional period to repurchase the underlying loans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash outflow of amount used for repaying the outstanding principal amount of debt.

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Carrying value as of the balance sheet date, of securities sold under agreements to repurchase and the carrying value, as of the balance sheet date, of the outstanding borrowings under warehouse and revolving lines of credit.

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB
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