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Debt - Schedule of Available and Outstanding Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jul. 24, 2026	Feb. 10, 2026	Dec. 31, 2025	Jun. 16, 2025	Mar. 10, 2025	Feb. 05, 2025	Jun. 22, 2022	Jan. 20, 2022	Sep. 16, 2021	Mar. 04, 2021	Nov. 04, 2020	Oct. 27, 2020	Sep. 24, 2018
Debt Instrument [Line Items]
Total Available	$ 3,042,160			$ 2,782,136
Principal Outstanding	2,583,379			2,313,070
Carrying Value	2,550,470			2,286,444
SMBC LC Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	300,000
Term Loan \| SMBC LC Facility
Debt Instrument [Line Items]
Total Available	25,000
SBA Debentures
Debt Instrument [Line Items]
Total Available	425,000			350,000
Principal Outstanding	350,000			350,000
Carrying Value	341,889			341,012
Maximum borrowing capacity	425,000			350,000
SBA Debentures \| HC IV
Debt Instrument [Line Items]
Maximum borrowing capacity	175,000			175,000									$ 175,000
SBA Debentures \| SBIC V
Debt Instrument [Line Items]
Maximum borrowing capacity	250,000			175,000
March 2026 A Notes
Debt Instrument [Line Items]
Total Available	0			50,000								$ 50,000
Principal Outstanding	0			50,000
Carrying Value	0			49,984
March 2026 B Notes
Debt Instrument [Line Items]
Total Available	0			50,000							$ 50,000
Principal Outstanding	0			50,000
Carrying Value	0			49,983
September 2026 Notes
Debt Instrument [Line Items]
Total Available	0			325,000						$ 325,000
Principal Outstanding	0			325,000
Carrying Value	0			324,302
January 2027 Notes
Debt Instrument [Line Items]
Total Available	350,000			350,000					$ 350,000
Principal Outstanding	350,000			350,000
Carrying Value	349,593			348,596
2028 Convertible Notes
Debt Instrument [Line Items]
Total Available	287,500			287,500		$ 287,500
Principal Outstanding	287,500			287,500
Carrying Value	282,405			280,412
February 2029 Notes
Debt Instrument [Line Items]
Total Available	300,000		$ 300,000	0
Principal Outstanding	300,000			0
Carrying Value	295,257			0
June 2030 Notes
Debt Instrument [Line Items]
Total Available	350,000			350,000	$ 350,000
Principal Outstanding	350,000			350,000
Carrying Value	343,919			342,694
2031 Asset-Backed Notes
Debt Instrument [Line Items]
Total Available	49,660			64,636				$ 150,000
Principal Outstanding	49,660			64,636
Carrying Value	49,660			64,530
July 2031 Notes
Debt Instrument [Line Items]
Total Available	325,000	$ 325,000		0
Principal Outstanding	325,000			0
Carrying Value	317,419			0
2033 Notes
Debt Instrument [Line Items]
Total Available	40,000			40,000										$ 40,000
Principal Outstanding	40,000			40,000
Carrying Value	39,232			39,151
MUFG Bank Facility
Debt Instrument [Line Items]
Total Available	440,000			440,000
Principal Outstanding	241,000			168,000
Carrying Value	241,000			168,000
SMBC Facility
Debt Instrument [Line Items]
Total Available	475,000			475,000
Principal Outstanding	290,219			277,934
Carrying Value	290,096			277,780
SMBC Facility \| SMBC LC Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	175,000			175,000			$ 175,000
SMBC Facility \| Term Loan
Debt Instrument [Line Items]
Total Available	25,000			25,000
Principal Outstanding	25,000			25,000
Carrying Value	$ 24,900			$ 24,800