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INVESTMENTS - Valuation Inputs (Details)
 9 Months Ended
Sep. 30, 2025
USD ($)
investment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
investment
Schedule of Investments [Line Items]      
Fair Value $ 2,536,315,000 [1]   $ 2,449,272,000 [2]
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments  
Unrealized gain (loss) $ 19,800,000 $ (13,000,000)  
Purchases of portfolio investments 561,582,000 345,954,000  
Senior debt and 1st lien notes      
Schedule of Investments [Line Items]      
Fair Value 1,785,626,000   1,686,411,000
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 1,738,067,000   1,625,501,000
Equity shares      
Schedule of Investments [Line Items]      
Fair Value 425,580,000   409,129,000
Equity shares | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 420,943,000   408,475,000
Subordinated debt and 2nd lien notes      
Schedule of Investments [Line Items]      
Fair Value 201,371,000   165,455,000
Subordinated debt and 2nd lien notes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 191,672,000   $ 153,703,000
Investments with No Previous Contractual Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments 464,500,000 272,400,000  
Investment with Previous Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments $ 90,200,000    
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments   $ 73,300,000  
Yield Analysis | Senior debt and 1st lien notes | Market Approach      
Schedule of Investments [Line Items]      
Number of investments | investment 7   7
Fair Value $ 35,300,000   $ 31,500,000
Yield Analysis | Subordinated debt and 2nd lien notes | Expected Recovery      
Schedule of Investments [Line Items]      
Number of investments | investment     1
Fair Value     $ 3,800,000
Market Approach | Senior debt and 1st lien notes | Yield Analysis      
Schedule of Investments [Line Items]      
Number of investments | investment 1   1
Fair Value $ 4,200,000   $ 600,000
Market Approach | Debt Securities, Structured Product Position | Yield Analysis      
Schedule of Investments [Line Items]      
Number of investments | investment 1    
Fair Value $ 2,100,000    
Market Approach | Equity shares | Yield Analysis      
Schedule of Investments [Line Items]      
Number of investments | investment     2
Fair Value     $ 20,200,000
Market Approach | Equity shares | Expected Recovery      
Schedule of Investments [Line Items]      
Number of investments | investment     1
Fair Value     $ 56,900
[1] All of the investment is or will be encumbered as security for the Company’s $0.7 billion senior secured credit facility with ING Capital LLC (“ING”) initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] All of the investment is or will be encumbered as security for the Company’s $0.8 billion February 2019 Credit Facility with ING.