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Long-Term Debt - Narrative (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2025 USD ($) renewalPeriod	Sep. 30, 2025 USD ($) extensionTerm Rate	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) extensionTerm renewalPeriod Rate	Sep. 30, 2024 USD ($)	Jun. 17, 2025 USD ($)	Dec. 31, 2024 USD ($)	Apr. 17, 2023 USD ($)	Feb. 16, 2023 USD ($)	Jun. 05, 2019 USD ($) tranche
Debt Instrument [Line Items]
Repayments of long-term debt				$ 594,000,000	$ 0
Debt instrument, repurchase program, maximum amount									$ 100,000,000
Cash sweeping event | Rate		175.00%		175.00%
Rapid amortization event | Rate		120.00%		120.00%
Manager termination event | Rate		120.00%		120.00%
Interest-only debt service coverage ratio, default event | Rate		110.00%		110.00%
Debt service coverage ratio | Rate		310.00%		310.00%
Unamortized debt issuance costs		$ 12,400,000		$ 12,400,000			$ 7,400,000
Gain (loss) on extinguishment of debt		$ 0	$ 0	$ (850,000)	0
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II and Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I
Debt Instrument [Line Items]
Number of tranches issued | tranche										2
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I
Debt Instrument [Line Items]
Debt interest rate (in percent)										4.194%
Debt instrument, face amount										$ 700,000,000
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II
Debt Instrument [Line Items]
Debt interest rate (in percent)		4.723%		4.723%			4.723%			4.723%
Debt instrument, face amount										$ 600,000,000
Amortization of debt issuance costs		$ 0		$ 400,000
Gain (loss) on extinguishment of debt				(900,000)
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II | Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of long-term debt				$ 594,000,000
Amortization of debt issuance costs			200,000		700,000
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2
Debt Instrument [Line Items]
Debt interest rate (in percent)		7.824%		7.824%			7.824%	7.824%
Debt instrument, face amount								$ 500,000,000
Debt instrument, term (in years)				10 years
Additional interest on fixed rate (in percent)				5.00%
Quarterly principal payment				$ 1,250,000
Covenant compliance, leverage ratio, maximum | Rate		525.00%		525.00%
Ratio of indebtedness to net capital | Rate		458.00%		458.00%
Make-whole premium		$ 20,900,000		$ 20,900,000
Annual principal payment		5,000,000		$ 5,000,000
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 | Ten Year United States Treasury Bill Rate
Debt Instrument [Line Items]
Additional interest on fixed rate (in percent)				9.24%
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, gross		8,000,000		$ 8,000,000
Amortization of debt issuance costs		300,000	300,000	900,000	800,000
Debt issuance costs, net		$ 5,300,000		$ 5,300,000
Series 2022-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 7.14% at December 31, 2024
Debt Instrument [Line Items]
Debt interest rate (in percent)							7.14%
Series 2022-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 7.14% at December 31, 2024 | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, expired amount						$ 325,000,000
Series 2025-1 6.720% Fixed Rate Senior Secured Notes, Class A-2
Debt Instrument [Line Items]
Debt interest rate (in percent)		6.72%		6.72%		6.72%	6.72%
Debt instrument, face amount						$ 600,000,000
Debt instrument, term (in years)				10 years
Additional interest on fixed rate (in percent)				5.00%
Quarterly principal payment				$ 1,500,000
Covenant compliance, leverage ratio, maximum | Rate		525.00%		525.00%
Ratio of indebtedness to net capital | Rate		458.00%		458.00%
Make-whole premium		$ 40,600,000		$ 40,600,000
Annual principal payment		6,000,000		$ 6,000,000
Series 2025-1 6.720% Fixed Rate Senior Secured Notes, Class A-2 | Ten Year United States Treasury Bill Rate
Debt Instrument [Line Items]
Additional interest on fixed rate (in percent)				7.85%
Series 2025-1 6.720% Fixed Rate Senior Secured Notes, Class A-2 | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, gross		7,500,000		$ 7,500,000
Amortization of debt issuance costs		300,000		400,000
Debt issuance costs, net		$ 7,100,000		$ 7,100,000
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025
Debt Instrument [Line Items]
Debt interest rate (in percent)		6.56%		6.56%
Number of additional extensions | extensionTerm		2		2
Additional extension (in years)				1 year
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 325,000,000					$ 325,000,000
Number of renewal periods | renewalPeriod	2			2
Renewal period term (in years)	1 year			1 year
Interest rate after renewal date (in percent)	5.00%
Debt, weighted average interest rate (in percent)		6.85%		6.85%
Letters of credit outstanding, amount		$ 600,000		$ 600,000
Line of credit facility, current borrowing capacity		224,400,000		224,400,000
Debt issuance costs, gross	$ 4,100,000
Amortization of debt issuance costs		300,000	$ 300,000	900,000	$ 900,000
Debt issuance costs, net		$ 6,600,000		6,600,000
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	2.50%
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit
Debt Instrument [Line Items]
Proceeds from long-term lines of credit				$ 100,000,000
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	2.00%
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	0.50%
Series 2025-1 Variable Funding Senior Notes, Class A-1, variable interest rate of 6.56% at September 30, 2025 | Letter of Credit | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	0.50%

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