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INVESTMENTS - Additional Details (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
investment
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2024
USD ($)
investment
Sep. 30, 2023
USD ($)
investment
Dec. 31, 2023
USD ($)
investment
Schedule of Investments [Line Items]          
Purchases of portfolio investments     $ 345,954,000 $ 400,507,000  
Fair Value $ 2,416,714,000   $ 2,416,714,000   $ 2,488,715,000
Number of portfolio companies | investment 8   8   4
Number of portfolio companies, initiated by the company | investment 6   6   2
Number of portfolio companies, that was on PIK non-accrual | investment 1   1    
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)     $ (13,000,000.0) $ 5,200,000  
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk          
Schedule of Investments [Line Items]          
Percentage of Total Portfolio     6.10%   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 11 10 30 25  
Purchases of portfolio investments $ 88,400,000 $ 64,500,000 $ 195,900,000 $ 156,800,000  
Existing Portfolio          
Schedule of Investments [Line Items]          
Purchases of portfolio investments 36,600,000 $ 73,400,000 149,900,000 134,200,000  
Equity Co-Investments          
Schedule of Investments [Line Items]          
Purchases of portfolio investments       55,000,000  
Joint Venture Equity Portfolio Companies Member          
Schedule of Investments [Line Items]          
Purchases of portfolio investments       2,500,000  
Equity shares          
Schedule of Investments [Line Items]          
Fair Value 382,531,000   382,531,000   $ 374,704,000
Equity shares | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value 378,208,000   378,208,000   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 $ 2,857,000   $ 2,857,000   $ 7,498,000
Equity shares | Market Approach | Yield Analysis          
Schedule of Investments [Line Items]          
Number of investments | investment 2   2    
Fair Value $ 19,200,000   $ 19,200,000    
Equity shares | Market Approach | Expected Recovery          
Schedule of Investments [Line Items]          
Number of investments | investment 1   1    
Fair Value $ 61,500   $ 61,500    
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 1,632,057,000   1,632,057,000   1,670,300,000
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value 1,559,820,000   1,559,820,000   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 $ 11,772,000   $ 11,772,000   $ 25,146,000
Senior debt and 1st lien notes | Yield Analysis | Market Approach          
Schedule of Investments [Line Items]          
Number of investments | investment 6   6   6
Fair Value $ 25,700,000   $ 25,700,000   $ 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 91,493,000   91,493,000   93,038,000
Structured products | Fair Value, Inputs, Level 3          
Schedule of Investments [Line Items]          
Fair Value 45,682,000   45,682,000   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 $ 12,779,000   12,779,000   $ 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     73,300,000    
Investments with No Previous Contractual Commitment to Provide Financing          
Schedule of Investments [Line Items]          
Purchases of portfolio investments     $ 272,400,000 267,100,000  
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing          
Schedule of Investments [Line Items]          
Purchases of portfolio investments       $ 81,400,000  
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 72   72   67
Investment Denominated in British Pounds Sterling          
Schedule of Investments [Line Items]          
Number of investments | investment 27   27   28