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INVESTMENTS - Additional Details (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
investment
Jun. 30, 2023
USD ($)
investment
Jun. 30, 2024
USD ($)
investment
Jun. 30, 2023
USD ($)
investment
Dec. 31, 2023
USD ($)
investment
Schedule of Investments [Line Items]          
Purchases of portfolio investments     $ 216,878,000 $ 255,744,000  
Fair Value $ 2,395,660,000   $ 2,395,660,000   $ 2,488,715,000
Number of portfolio companies | investment 7   7   4
Number of portfolio companies, initiated by the company | investment 5   5   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  
Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Unrealized gain (loss)     $ (20,700,000) $ 16,000,000  
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk          
Schedule of Investments [Line Items]          
Percentage of Total Portfolio     6.30%   6.30%
Sierra Merger          
Schedule of Investments [Line Items]          
Number of portfolio companies | investment 1   1   1
MVC Acquisition          
Schedule of Investments [Line Items]          
Number of portfolio companies | investment 1   1   1
New Investments          
Schedule of Investments [Line Items]          
Number of investments entered into | investment 9 4 19 15  
Purchases of portfolio investments $ 38,500,000 $ 11,700,000 $ 102,100,000 $ 81,400,000  
Existing Portfolio          
Schedule of Investments [Line Items]          
Purchases of portfolio investments 40,000,000 41,600,000 118,800,000 71,600,000  
Equity Co-Investments          
Schedule of Investments [Line Items]          
Purchases of portfolio investments   10,000,000   55,000,000  
Joint Venture Equity Portfolio Companies Member          
Schedule of Investments [Line Items]          
Purchases of portfolio investments   $ 2,500,000   2,500,000  
Equity shares          
Schedule of Investments [Line Items]          
Fair Value 383,304,000   383,304,000   $ 374,704,000
Equity shares | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value 382,595,000   382,595,000   374,572,000
Equity shares | Yield Analysis | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value         8,788,000
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 $ 8,881,000   $ 8,881,000   $ 7,498,000
Equity shares | Market Approach | Yield Analysis          
Schedule of Investments [Line Items]          
Number of investments | investment 2   2    
Fair Value $ 20,400,000   $ 20,400,000    
Equity shares | Market Approach | Expected Recovery          
Schedule of Investments [Line Items]          
Number of investments | investment 1   1    
Fair Value $ 65,900   $ 65,900    
Equity shares | Yield Analysis | Market Approach          
Schedule of Investments [Line Items]          
Number of investments | investment         1
Fair Value         $ 5,300,000
Equity shares | Expected Recovery | Market Approach          
Schedule of Investments [Line Items]          
Number of investments | investment         1
Fair Value         $ 0
Senior debt and 1st lien notes          
Schedule of Investments [Line Items]          
Fair Value 1,581,827,000   1,581,827,000   1,670,300,000
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value 1,519,947,000   1,519,947,000   1,593,797,000
Senior debt and 1st lien notes | Yield Analysis | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value         1,399,907,000
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 $ 17,106,000   $ 17,106,000   $ 25,146,000
Senior debt and 1st lien notes | Yield Analysis | Market Approach          
Schedule of Investments [Line Items]          
Number of investments | investment 4   4   6
Fair Value $ 19,400,000   $ 19,400,000   $ 20,000,000
Senior debt and 1st lien notes | Discounted Cash Flow Analysis | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Discount Rate          
Schedule of Investments [Line Items]          
Number of investments | investment         1
Fair Value         $ 9,900,000
Structured products          
Schedule of Investments [Line Items]          
Fair Value 92,487,000   92,487,000   93,038,000
Structured products | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value 45,500,000   45,500,000   42,972,000
Structured products | Yield Analysis | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value         30,529,000
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 $ 13,202,000   13,202,000   $ 12,443,000
Structured products | Discounted Cash Flow Analysis | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes          
Schedule of Investments [Line Items]          
Number of investments | investment         1
Fair Value         $ 3,300,000
Investment with Previous Commitment to Provide Financing          
Schedule of Investments [Line Items]          
Purchases of portfolio investments     56,100,000    
Investments with No Previous Contractual Commitment to Provide Financing          
Schedule of Investments [Line Items]          
Purchases of portfolio investments     $ 164,800,000 160,500,000  
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing          
Schedule of Investments [Line Items]          
Purchases of portfolio investments       $ 50,000,000  
Investment Denominated in Canadian Dollars          
Schedule of Investments [Line Items]          
Number of investments | investment 2   2   2
Investment Denominated in Danish Kroner          
Schedule of Investments [Line Items]          
Number of investments | investment 1   1   1
Investment Denominated in Australian Dollars          
Schedule of Investments [Line Items]          
Number of investments | investment 12   12   11
Investment Denominated in New Zealand Dollars          
Schedule of Investments [Line Items]          
Number of investments | investment 2   2   2
Investment Denominated in Norwegian Krone          
Schedule of Investments [Line Items]          
Number of investments | investment 1   1   1
Investment Denominated in Swiss Francs          
Schedule of Investments [Line Items]          
Number of investments | investment 2   2   2
Investment Denominated in Swedish Krone          
Schedule of Investments [Line Items]          
Number of investments | investment 2   2   2
Investment Denominated in Euros          
Schedule of Investments [Line Items]          
Number of investments | investment 69   69   67
Investment Denominated in British Pounds Sterling          
Schedule of Investments [Line Items]          
Number of investments | investment 27   27   28