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INVESTMENTS - Schedule of Geographic Composition of Investment at Fair Value (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Fair Value $ 2,536,315 [1] $ 2,449,272 [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value 1,194,961 1,095,308
Jocassee Partners LLC | Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing    
Schedule of Investments [Line Items]    
Fair Value $ 1,183,290 $ 1,085,025
Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Australia | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 23,903 $ 23,187
Australia | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Austria | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 6,463 $ 5,695
Austria | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Belgium | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 20,614 $ 20,741
Belgium | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Canada | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 373 $ 590
Canada | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
France | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 107,376 $ 124,810
France | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.00% 12.00%
Germany | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 48,368 $ 35,691
Germany | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 3.00%
Hong Kong | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 14,950 $ 14,843
Hong Kong | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Ireland | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 13,607 $ 7,302
Ireland | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Luxembourg | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 2,427 $ 2,128
Luxembourg | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Netherlands | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 44,489 $ 39,504
Netherlands | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Panama | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 1,470
Panama | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Singapore | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 4,945 $ 5,000
Singapore | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 1.00%
Spain | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 3,182 $ 2,078
Spain | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Sweden | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 3,523
Sweden | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Switzerland | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 592 $ 595
Switzerland | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
United Kingdom | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 122,695 $ 111,097
United Kingdom | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.00% 10.00%
USA | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 769,306 $ 686,771
USA | Jocassee Partners LLC | Percentage of Total Portfolio, at Fair Value | Geographic Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 65.00% 63.00%
[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.