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INVESTMENTS - Jocassee Partners LLC (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
May 08, 2019
May 07, 2019
Schedule of Investments [Line Items]          
Committed investment amount $ 418,996,000   $ 388,772,000    
Total dividend income 10,742,000 $ 8,477,000      
Fair Value 2,571,228,000   2,449,272,000    
Cost 2,610,675,000   2,522,696,000    
Borrowings under credit facility 497,268,000   438,590,000    
Repayments received / sales of portfolio investments 122,362,000 118,008,000      
Jocassee Partners LLC          
Schedule of Investments [Line Items]          
Repayments received / sales of portfolio investments 1,063,300,000   1,063,300,000    
Due from related parties 0   0    
Jocassee Partners LLC | Subscription Facility | Bank Of America Subscription Facility | Line of Credit          
Schedule of Investments [Line Items]          
Borrowings under credit facility 176,800,000   173,500,000    
Jocassee Partners LLC | Subscription Facility | Citibank N.A. Subscription Facility | Line of Credit          
Schedule of Investments [Line Items]          
Borrowings under credit facility 173,300,000   266,700,000    
Jocassee Partners LLC | Subscription Facility | Term Debt Securitization | Line of Credit          
Schedule of Investments [Line Items]          
Borrowings under credit facility 323,800,000   323,700,000    
Jocassee Partners LLC          
Schedule of Investments [Line Items]          
Dividends 15,700,000 15,700,000      
Total dividend income 1,400,000 $ 1,400,000      
Fair Value 1,081,889,000   1,095,308,000    
Cost $ 1,140,101,000   $ 1,158,999,000    
Interest-earning assets, average yield 8.90%   9.20%    
Jocassee Partners LLC | Long-Term Investments          
Schedule of Investments [Line Items]          
Fair Value $ 1,081,900,000   $ 1,095,300,000    
Cost $ 1,140,100,000   $ 1,159,000,000    
Jocassee Partners LLC | SCRS          
Schedule of Investments [Line Items]          
Committed investment amount       $ 500,000,000 $ 100,000,000