Quarterly report pursuant to Section 13 or 15(d)

DEBT - Schedule of Debt (Details)

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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Outstanding Balance $ 2,211,200 $ 1,810,000
Unamortized Debt Issuance (Costs)/ Premiums (13,132) (7,656)
Recorded Value 2,198,068 1,802,344
Estimated Fair Value 2,125,622 1,704,974
July 2026 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 500,000 500,000
Unamortized Debt Issuance (Costs)/ Premiums (1,075) (1,338)
Recorded Value 498,925 498,662
Estimated Fair Value 467,950 458,105
March 2029 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 350,000  
Unamortized Debt Issuance (Costs)/ Premiums (3,358)  
Recorded Value 346,642 0
Estimated Fair Value 353,654  
May 2024 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance   450,000
Unamortized Debt Issuance (Costs)/ Premiums   182
Recorded Value 0 450,182
Estimated Fair Value   447,246
June 2027 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 300,000  
Unamortized Debt Issuance (Costs)/ Premiums (2,340)  
Recorded Value 297,660 0
Estimated Fair Value 300,081  
SBIC Debentures | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 286,200 350,000
Unamortized Debt Issuance (Costs)/ Premiums (5,583) (5,465)
Recorded Value 280,617 344,535
Estimated Fair Value 229,680 288,468
December 2025 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 150,000 150,000
Unamortized Debt Issuance (Costs)/ Premiums (776) (1,035)
Recorded Value 149,224 148,965
Estimated Fair Value 149,257 151,155
Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Recorded Value 625,000 360,000
Credit Facility | Corporate Facility | Line of Credit    
Debt Instrument [Line Items]    
Outstanding Balance 465,000 200,000
Unamortized Debt Issuance (Costs)/ Premiums 0 0
Recorded Value 465,000 200,000
Estimated Fair Value 465,000 200,000
Credit Facility | SPV Facility | Line of Credit    
Debt Instrument [Line Items]    
Outstanding Balance 160,000 160,000
Unamortized Debt Issuance (Costs)/ Premiums 0 0
Recorded Value 160,000 160,000
Estimated Fair Value $ 160,000 $ 160,000