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INVESTMENTS - Valuation Inputs (Details)
 6 Months Ended
Jun. 30, 2025
USD ($)
investment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
investment
Schedule of Investments [Line Items]      
Fair Value $ 2,623,882,000   $ 2,449,272,000
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  
Purchases of portfolio investments $ 409,178,000 $ 216,878,000  
Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Unrealized gain (loss) 34,000,000 (20,700,000)  
Senior debt and 1st lien notes      
Schedule of Investments [Line Items]      
Fair Value 1,851,109,000   1,686,411,000
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 1,795,252,000   1,625,501,000
Subordinated debt and 2nd lien notes      
Schedule of Investments [Line Items]      
Fair Value 192,468,000   165,455,000
Subordinated debt and 2nd lien notes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 184,616,000   153,703,000
Equity shares      
Schedule of Investments [Line Items]      
Fair Value 440,536,000   409,129,000
Equity shares | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 439,652,000   $ 408,475,000
Investments with No Previous Contractual Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments 355,300,000 164,800,000  
Investment with Previous Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments $ 50,700,000    
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments   $ 56,100,000  
Yield Analysis | Senior debt and 1st lien notes | Market Approach      
Schedule of Investments [Line Items]      
Number of investments | investment 3   7
Fair Value $ 25,800,000   $ 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
Valuation, Broker Quote Analysis | Senior debt and 1st lien notes | Market Approach      
Schedule of Investments [Line Items]      
Number of investments | investment 1    
Fair Value $ 100,000    
Market Approach | Senior debt and 1st lien notes | Yield Analysis      
Schedule of Investments [Line Items]      
Number of investments | investment 1   1
Fair Value $ 4,100,000   $ 600,000
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