Quarterly report pursuant to Section 13 or 15(d)

FINANCIAL HIGHLIGHTS (Details)

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FINANCIAL HIGHLIGHTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Investment Company, Financial Highlights [Roll Forward]        
NAV at the beginning of the period (in dollars per share) $ 7.77 $ 7.61    
Net investment income (in dollars per share) 0.18 0.18    
Net realized gain (loss) (in dollars per share) (0.02) 0.04    
Net unrealized depreciation (in dollars per share) (0.02) (0.06)    
Income tax provision (in dollars per share) (0.01) (0.01)    
Net increase in net assets resulting from operations (in dollars per share) 0.13 0.15    
Dividends paid from net investment income (in dollars per share) (0.19) (0.15)    
Dividends paid from capital gains (in dollars per share) 0 (0.03)    
Dividends paid or accrued (in dollars per share) (0.19) (0.18)    
Other (in dollars per share) 0.01 0.01    
NAV at the end of the period (in dollars per share) $ 7.72 $ 7.59    
Shares outstanding at the end of the period (in shares) 80,112,588 80,150,887    
NAV at end of period $ 618,521 $ 608,299 $ 622,307 $ 609,665
Average NAV 620,414 608,982    
Average outstanding debt $ 488,688 $ 474,438    
Investment Company, Ratio To Average Net Assets [Abstract]        
Ratio of total expenses, including income tax provision, to average NAV (as a percent) 3.62% 2.97%    
Ratio of operating expenses to average NAV (as a percent) 3.47% 2.78%    
Ratio of operating expenses excluding interest expense, to average NAV (as a percent) 1.93% 1.41%    
Ratio of operating expenses, excluding interest expense and incentive fees to average NAV (as a percent) 1.34% 0.97%    
Ratio of net investment income to average NAV (as a percent) 2.34% 2.32%    
Portfolio turnover ratio (as a percent) 4.72% 2.34%    
Total return based on change in NAV (as a percent) 1.70% 2.01%    
Expense waivers $ 2,100 $ 1,900    
Investment Company, Ratio To Average Net Assets Excluding Expense Waivers [Abstract]        
Ratio of total expenses, including income tax provision, to average NAV (as a percent) 3.97% 3.29%    
Ratio of operating expenses to average NAV (as a percent) 3.81% 3.10%    
Ratio of operating expenses, excluding interest expense, to average NAV (as a percent) 2.27% 1.73%    
Ratio of operating expenses, excluding interest expense and incentive fees, to average NAV (as a percent) 0.0169 0.0128    
Ratio of net investment income to average NAV (as a percent) 2.01% 2.01%    
Total return based on change in NAV (as a percent) 1.36% 1.70%