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INVESTMENTS - Jocassee Partners LLC (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
May 08, 2019
May 07, 2019
Schedule of Investments [Line Items]                  
Committed investment amount $ 306,343,000 $ 305,903,000 $ 306,343,000   $ 306,343,000   $ 305,903,000    
Total dividend income     9,841,000 $ 8,515,000 30,051,000 $ 26,639,000      
Fair Value 2,416,714,000 2,488,715,000 2,416,714,000   2,416,714,000   2,488,715,000    
Cost 2,446,920,000 2,535,576,000 2,446,920,000   2,446,920,000   2,535,576,000    
Borrowings under credit facility 347,811,000 719,914,000 347,811,000   347,811,000   719,914,000    
Repayments received / sales of portfolio investments         422,926,000 273,550,000      
Jocassee Partners LLC                  
Schedule of Investments [Line Items]                  
Repayments received / sales of portfolio investments         1,036,100,000   1,036,100,000    
Gain on sale of investments       500,000   300,000      
Due from related parties 0 0 0   0   0    
Jocassee Partners LLC | Subscription Facility | Bank Of America Subscription Facility | Line of Credit                  
Schedule of Investments [Line Items]                  
Borrowings under credit facility 179,500,000 177,700,000 179,500,000   179,500,000   177,700,000    
Jocassee Partners LLC | Subscription Facility | Citibank N.A. Subscription Facility | Line of Credit                  
Schedule of Investments [Line Items]                  
Borrowings under credit facility 273,300,000 398,200,000 273,300,000   273,300,000   398,200,000    
Jocassee Partners LLC | Subscription Facility | Term Debt Securitization | Line of Credit                  
Schedule of Investments [Line Items]                  
Borrowings under credit facility 323,700,000 323,500,000 323,700,000   323,700,000   323,500,000    
Jocassee Partners LLC                  
Schedule of Investments [Line Items]                  
Dividends     15,700,000 15,700,000 47,100,000 47,100,000      
Total dividend income     1,400,000 $ 1,400,000 4,300,000 $ 4,300,000      
Fair Value 1,162,575,000 1,330,526,000 1,162,575,000   1,162,575,000   1,330,526,000    
Cost $ 1,202,818,000 $ 1,375,734,000 1,202,818,000   1,202,818,000   1,375,734,000    
Interest-earning assets, average yield 9.60% 9.90%              
Jocassee Partners LLC | Long-Term Investments                  
Schedule of Investments [Line Items]                  
Fair Value $ 1,162,600,000 $ 1,330,500,000 1,162,600,000   1,162,600,000   1,330,500,000    
Cost $ 1,202,800,000 $ 1,375,700,000 $ 1,202,800,000   $ 1,202,800,000   $ 1,375,700,000    
Jocassee Partners LLC | SCRS                  
Schedule of Investments [Line Items]                  
Committed investment amount               $ 500,000,000 $ 100,000,000