v3.25.2
FINANCIAL HIGHLIGHTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Investment Company, Financial Highlights [Roll Forward]            
NAV as of the beginning of the period (in dollars per share) $ 31.65 $ 29.20        
Net investment income (in dollars per share) 1.96 1.99        
Net realized gain (loss) (in dollars per share) 0.26 (0.10)        
Net unrealized appreciation (in dollars per share) 0.49 0.74        
Income tax provision on net realized gain and net unrealized appreciation (in dollars per share) (0.03) (0.18)        
Net increase in net assets resulting from operations (in dollars per share) 2.68 2.45        
Dividends paid from net investment income (in dollars per share) (2.10) (2.04)        
Dividends paid (in dollars per share) (2.10) (2.04)        
Impact of the net change in monthly dividends declared prior to the end of the period and paid in the subsequent period (in dollars per share) 0 (0.01)        
Accretive effect of stock offerings (issuing shares above NAV per share) (in dollars per share) 0.08 0.21        
Accretive effect of DRIP issuance (issuing shares above NAV per share) (in dollars per share) 0.09 0.07        
Other (in dollars per share) (0.10) (0.08)        
NAV as of the end of the period (in dollars per share) 32.30 29.80        
Market value as of the end of the period (in dollars per share) $ 59.10 $ 50.49        
Shares outstanding as of the end of the period (in shares) 89,282,595 86,552,506        
NAV as of the end of the period $ 2,884,217 $ 2,578,956 $ 2,840,133 $ 2,797,838 $ 2,515,970 $ 2,477,399
Average NAV 2,840,729 2,524,108        
Average outstanding debt $ 2,206,714 $ 2,051,543        
Ratios to average NAV:            
Ratio of total expenses, including income tax expense, to average NAV 3.86% 4.31%        
Ratio of operating expenses to average NAV 3.45% 3.43%        
Ratio of operating expenses, excluding interest expense, to average NAV 1.20% 1.22%        
Ratio of net investment income to average NAV 6.13% 6.75%        
Portfolio turnover ratio 11.40% 8.62%        
Total investment return 4.67% 21.97%        
Total return based on change in NAV 8.53% 8.47%        
Related Party | External Investment Manager            
Ratios to average NAV:            
Total expenses $ 11,200 $ 11,400