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Debt Obligations - Narrative (Details)		1 Months Ended					3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) $ / shares	Oct. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) extension	Jan. 31, 2024 USD ($) facility	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	May 31, 2024 USD ($)	Apr. 30, 2024 USD ($)	Feb. 29, 2024 USD ($)
Debt Obligations
Line of credit facility, number of facilities consolidated | facility						2
Outstanding letters of credit	$ 5,000,000.0		$ 5,000,000.0				$ 5,000,000.0		$ 5,000,000.0
Junior subordinated notes to subsidiary trust issuing preferred securities	$ 144,480,000		$ 144,480,000				$ 144,480,000		$ 144,480,000		$ 143,896,000
Debt, Wtd. Avg. Rate	7.38%		7.38%				7.38%		7.38%
CLO 15
Debt Obligations
Debt paid down				$ 674,400,000
Debt face value issued to third parties											$ 674,412,000
Debt, Wtd. Avg. Rate											6.82%
CLO 14, 16 and 19
Debt Obligations
Debt paid down									$ 896,500,000
Q Series securitization
Debt Obligations
Weighted average note rate including certain fees and costs, percentage	7.87%		7.87%				7.87%		7.87%		7.99%
Debt paid down									$ 58,100,000
Debt face value issued to third parties	$ 157,198,000		$ 157,198,000				$ 157,198,000		$ 157,198,000		$ 215,278,000
Debt, Wtd. Avg. Rate	6.96%		6.96%				6.96%		6.96%		7.38%
9.00% Notes | Senior unsecured notes | Subsequent event
Debt Obligations
Debt face value issued to third parties		$ 100,000,000.0
Interest rate		9.00%
4.75% Notes
Debt Obligations
Debt face value issued to third parties											$ 110,000,000
Debt, Wtd. Avg. Rate	4.75%		4.75%				4.75%		4.75%		4.75%
4.75% Notes | Subsequent event
Debt Obligations
Debt paid down		$ 110,000,000
Interest rate		4.75%
Convertible senior unsecured notes
Debt Obligations
Debt face value issued to third parties	$ 287,500,000		$ 287,500,000				$ 287,500,000		$ 287,500,000		$ 287,500,000
Percentage of notes required to be repurchased if the agreement is fundamentally changed									100.00%
Interest expense							6,100,000	$ 6,100,000	$ 18,300,000	$ 18,200,000
Interest expense related to cash coupon							5,400,000	5,400,000	16,200,000	16,100,000
Deferred fees expensed as interest expense							$ 700,000	$ 700,000	$ 2,100,000	$ 2,100,000
Weighted average cost of notes, percentage	8.43%		8.43%				8.43%		8.43%		8.42%
7.50% convertible notes
Debt Obligations
Interest rate	7.50%		7.50%				7.50%		7.50%
Conversion rate of the notes to common stock, per $1,000 principal amount of notes	0.0609100
Conversion price per share of common stock (in dollars per share) | $ / shares	$ 16.42		$ 16.42				$ 16.42		$ 16.42
Junior subordinated notes
Debt Obligations
Weighted average note rate including certain fees and costs, percentage	7.56%		7.56%				7.56%		7.56%		8.56%
Debt face value issued to third parties	$ 154,336,000		$ 154,336,000				$ 154,336,000		$ 154,336,000		$ 154,336,000
Deferred fees expensed as interest expense									1,400,000		1,500,000
Junior subordinated notes to subsidiary trust issuing preferred securities	144,500,000		144,500,000				144,500,000		144,500,000		143,900,000
Deferred amount due at maturity	$ 8,500,000		$ 8,500,000				$ 8,500,000		$ 8,500,000		$ 9,000,000.0
Debt, Wtd. Avg. Rate	7.47%		7.47%				7.47%		7.47%		8.48%
Amount payable on default of senior debt	$ 0		$ 0				$ 0		$ 0
Structured Business
Debt Obligations
Weighted average note rate including certain fees and costs, percentage	7.95%		7.95%				7.95%		7.95%		8.26%
Leverage on loans and investment portfolio financed through credit and repurchase facilities, excluding securities repurchase facility and working capital facility	68.00%		68.00%				68.00%		68.00%		69.00%
Debt, Wtd. Avg. Rate	7.49%		7.49%				7.49%		7.49%
Structured Business | Minimum
Debt Obligations
Weighted average loan spread						0.0550
Structured Business | $400M credit facility
Debt Obligations
Maximum borrowing capacity	$ 400,000,000.0		$ 400,000,000.0				$ 400,000,000.0		$ 400,000,000.0
Variable rate, spread			3.25%
SOFR floor, percentage			1.00%
Debt, Wtd. Avg. Rate	8.21%		8.21%				8.21%		8.21%
Structured Business | $250M repurchase facility, maturing 2027
Debt Obligations
Maximum borrowing capacity	$ 250,000,000.0		$ 250,000,000.0				$ 250,000,000.0		$ 250,000,000.0
Variable rate, spread			3.25%
SOFR floor, percentage			2.00%
Length of extension option	1 year		1 year				1 year		1 year
Debt, Wtd. Avg. Rate	0.00%		0.00%				0.00%		0.00%
Structured Business | $650M repurchase facility
Debt Obligations
Maximum borrowing capacity				$ 650,000,000.0
SOFR floor, percentage				0.25%
Structured Business | $650M repurchase facility | Minimum
Debt Obligations
Variable rate, spread				2.61%
Structured Business | $650M repurchase facility | Maximum
Debt Obligations
Variable rate, spread				3.11%
Structured Business | $200M credit facility
Debt Obligations
Maximum borrowing capacity					$ 200,000,000.0
Structured Business | $100M credit facility
Debt Obligations
Maximum borrowing capacity	$ 100,000,000		$ 100,000,000				$ 100,000,000		$ 100,000,000				$ 100,000,000.0
Debt, Wtd. Avg. Rate	0.00%		0.00%				0.00%		0.00%
Structured Business | $500M repurchase facility
Debt Obligations
Maximum borrowing capacity														$ 500,000,000.0
Structured Business | $1B repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 1,000,000,000		$ 1,000,000,000		1,000,000,000.00		$ 1,000,000,000		$ 1,000,000,000
Debt, Wtd. Avg. Rate	7.51%		7.51%				7.51%		7.51%
Structured Business | $450M repurchase facility
Debt Obligations
Maximum borrowing capacity														$ 450,000,000.0
Structured Business | $350M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 350,000,000		$ 350,000,000		$ 350,000,000.0		$ 350,000,000		$ 350,000,000
Length of extension option					1 year
Maturity extensions exercised | extension					1
Number of extension options | extension					2
Debt, Wtd. Avg. Rate	7.05%		7.05%				7.05%		7.05%
Structured Business | $250M credit facility
Debt Obligations
Maximum borrowing capacity	$ 250,000,000		$ 250,000,000		$ 250,000,000.0		$ 250,000,000		$ 250,000,000
Variable rate, spread					3.25%
SOFR floor, percentage					2.50%
Length of extension option	1 year		1 year		1 year		1 year		1 year
Debt, Wtd. Avg. Rate	8.21%		8.21%				8.21%		8.21%
Structured Business | $225M credit facility
Debt Obligations
Maximum borrowing capacity											$ 225,000,000.0
Structured Business | $25M credit facility
Debt Obligations
Maximum borrowing capacity											$ 25,000,000.0
Structured Business | $150M credit facility
Debt Obligations
Maximum borrowing capacity						$ 150,000,000.0
Variable rate, spread						3.00%
Agency Business
Debt Obligations
Outstanding letters of credit				$ 70,000,000.0								$ 64,000,000.0
Debt, Wtd. Avg. Rate	6.37%		6.37%				6.37%		6.37%
Agency Business | $200M credit facility
Debt Obligations
Maximum borrowing capacity	$ 200,000,000		$ 200,000,000				$ 200,000,000		$ 200,000,000
Debt, Wtd. Avg. Rate	6.36%		6.36%				6.36%		6.36%
Agency Business | $100M credit facility
Debt Obligations
Maximum borrowing capacity	$ 100,000,000		$ 100,000,000				$ 100,000,000		$ 100,000,000
Debt, Wtd. Avg. Rate	6.31%		6.31%				6.31%		6.31%
Agency Business | $500M repurchase facility
Debt Obligations
Maximum borrowing capacity	$ 500,000,000		$ 500,000,000	$ 500,000,000.0			$ 500,000,000		$ 500,000,000
Debt, Wtd. Avg. Rate	6.33%		6.33%				6.33%		6.33%

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Amount of the principal payments due at maturity, which is being amortized into expense over the life of the debt.

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Represents the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding, including certain fees and costs.

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

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Minimum variable interest rate for loans receivable.

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Amount of amortization expense attributable to debt issuance costs.

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The price per share of the conversion feature embedded in the debt instrument.

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