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FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights, Additional Information (Details) - $ / shares
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Investment Company, Financial Highlights [Line Items]        
Additional dividends declared (in dollars per share)   $ 0.09    
Per share market value at end of period (in dollars per share) $ 19.47 16.88 $ 18.47 $ 21.19
Total distributions to stockholders (in dollars per share) $ 1.44 $ 1.36    
Ratio of operating expenses to average net assets 12.80% 9.77%    
Base management fees        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 3.14% 3.26%    
Income based fees and capital gains incentive fees        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 3.64% 1.54%    
Cost of borrowing        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 5.59% 4.54%    
Other operating expenses        
Investment Company, Financial Highlights [Line Items]        
Ratio of operating expenses to average net assets 0.43% 0.43%