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INVESTMENTS - Additional Details (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
company
investment
segment
Mar. 31, 2024
USD ($)
investment
Dec. 31, 2024
USD ($)
company
investment
Schedule of Investments [Line Items]      
Purchases of portfolio investments $ 167,244,000 $ 143,128,000  
Fair Value $ 2,571,228,000   $ 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  
Number of portfolio companies | company 9   8
Number of portfolio companies, initiated by the company | company 7   5
Number of portfolio companies, that was on PIK non-accrual | company 1   1
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Unrealized gain (loss) $ 17,700,000 $ 4,200,000  
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk      
Schedule of Investments [Line Items]      
Percentage of Total Portfolio 5.90%   6.20%
Sierra Merger      
Schedule of Investments [Line Items]      
Number of portfolio companies | company 2   2
MVC Acquisition      
Schedule of Investments [Line Items]      
Number of portfolio companies | company     1
New Investments      
Schedule of Investments [Line Items]      
Number of investments entered into | investment 14 10  
Purchases of portfolio investments $ 128,200,000 $ 63,500,000  
Existing Portfolio      
Schedule of Investments [Line Items]      
Purchases of portfolio investments 78,700,000 78,900,000  
Equity shares      
Schedule of Investments [Line Items]      
Fair Value 434,144,000   $ 409,129,000
Equity shares | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 429,043,000   408,475,000
Equity shares | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 2,799,000   $ 6,884,000
Equity shares | Market Approach | Yield Analysis      
Schedule of Investments [Line Items]      
Number of investments | investment     2
Fair Value     $ 20,200,000
Equity shares | Market Approach | Expected Recovery      
Schedule of Investments [Line Items]      
Number of investments | investment     1
Fair Value     $ 56,900
Senior debt and 1st lien notes      
Schedule of Investments [Line Items]      
Fair Value 1,819,640,000   1,686,411,000
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 1,767,792,000   1,625,501,000
Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value $ 3,680,000   $ 3,840,000
Senior debt and 1st lien notes | Market Approach | Yield Analysis      
Schedule of Investments [Line Items]      
Number of investments | investment     1
Fair Value     $ 600,000
Senior debt and 1st lien notes | Yield Analysis | Market Approach      
Schedule of Investments [Line Items]      
Number of investments | investment 1   7
Fair Value $ 2,900,000   $ 31,500,000
Senior debt and 1st lien notes | Valuation, Broker Quote Analysis | Market Approach      
Schedule of Investments [Line Items]      
Number of investments | investment 1    
Fair Value $ 200,000    
Structured products      
Schedule of Investments [Line Items]      
Fair Value 53,766,000   79,548,000
Structured products | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 23,504,000   48,664,000
Structured products | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value 20,296,000   $ 12,777,000
Investment with Previous Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments 29,600,000    
Investments with No Previous Contractual Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments $ 177,300,000 105,300,000  
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing      
Schedule of Investments [Line Items]      
Purchases of portfolio investments   $ 37,000,000  
Investment Denominated in Canadian Dollars      
Schedule of Investments [Line Items]      
Number of investments | investment 1   1
Investment Denominated in Danish Kroner      
Schedule of Investments [Line Items]      
Number of investments | investment 1   1
Investment Denominated in Australian Dollars      
Schedule of Investments [Line Items]      
Number of investments | investment 10   11
Investment Denominated in New Zealand Dollars      
Schedule of Investments [Line Items]      
Number of investments | investment 2   2
Investment Denominated in Norwegian Krone      
Schedule of Investments [Line Items]      
Number of investments | investment 1   1
Investment Denominated in Swiss Francs      
Schedule of Investments [Line Items]      
Number of investments | investment 2   2
Investment Denominated in Swedish Krone      
Schedule of Investments [Line Items]      
Number of investments | investment 1   2
Investment Denominated in Euros      
Schedule of Investments [Line Items]      
Number of investments | investment 72   72
Investment Denominated in British Pounds Sterling      
Schedule of Investments [Line Items]      
Number of investments | investment 28   27
Subordinated debt and 2nd lien notes      
Schedule of Investments [Line Items]      
Fair Value $ 159,085,000   $ 165,455,000
Subordinated debt and 2nd lien notes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value $ 140,472,000   153,703,000
Subordinated debt and 2nd lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Fair Value, Inputs, Level 3      
Schedule of Investments [Line Items]      
Fair Value     $ 6,523,000
Subordinated debt and 2nd lien notes | Yield Analysis | Expected Recovery      
Schedule of Investments [Line Items]      
Number of investments | investment     1
Fair Value     $ 3,800,000
Subordinated debt and 2nd lien notes | Expected Recovery | Yield Analysis      
Schedule of Investments [Line Items]      
Number of investments | investment 1    
Fair Value $ 3,800,000