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
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Outstanding Balance $ 2,059,200 $ 1,810,000
Unamortized Debt Issuance (Costs)/ Premiums (10,785) (7,656)
Recorded Value 2,048,415 1,802,344
Estimated Fair Value 1,965,248 1,704,974
July 2026 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 500,000 500,000
Unamortized Debt Issuance (Costs)/ Premiums (1,206) (1,338)
Recorded Value 498,794 498,662
Estimated Fair Value 466,270 458,105
May 2024 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 450,000 450,000
Unamortized Debt Issuance (Costs)/ Premiums 45 182
Recorded Value 450,045 450,182
Estimated Fair Value 449,933 447,246
March 2029 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 350,000  
Unamortized Debt Issuance (Costs)/ Premiums (3,531)  
Recorded Value 346,469 0
Estimated Fair Value 356,223  
SBIC Debentures | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 286,200 350,000
Unamortized Debt Issuance (Costs)/ Premiums (5,187) (5,465)
Recorded Value 281,013 344,535
Estimated Fair Value 220,824 288,468
December 2025 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 150,000 150,000
Unamortized Debt Issuance (Costs)/ Premiums (906) (1,035)
Recorded Value 149,094 148,965
Estimated Fair Value 148,998 151,155
Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Recorded Value 323,000 360,000
Credit Facility | Corporate Facility | Line of Credit    
Debt Instrument [Line Items]    
Outstanding Balance 313,000 200,000
Unamortized Debt Issuance (Costs)/ Premiums 0 0
Recorded Value 313,000 200,000
Estimated Fair Value 313,000 200,000
Credit Facility | SPV Facility | Line of Credit    
Debt Instrument [Line Items]    
Outstanding Balance 10,000 160,000
Unamortized Debt Issuance (Costs)/ Premiums 0 0
Recorded Value 10,000 160,000
Estimated Fair Value $ 10,000 $ 160,000