v3.26.3
FINANCIAL HIGHLIGHTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Investment Company, Financial Highlights [Roll Forward]                
NAV as of the beginning of the period (in dollars per share) $ 33.33 $ 31.65            
Net investment income (in dollars per share) 2.80 2.92            
Net realized gain (in dollars per share) 0.25 0.04            
Net unrealized appreciation (in dollars per share) 0.54 1.20            
Income tax provision on net realized gain and net unrealized appreciation (in dollars per share) (0.20) (0.10)            
Net increase in net assets resulting from operations (in dollars per share) 3.39 4.06            
Dividends paid from net investment income (in dollars per share) (3.26) (3.17)            
Dividends paid (in dollars per share) (3.26) (3.17)            
Accretive effect of stock offerings (issuing shares above NAV per share) (in dollars per share) 0.68 0.11            
Accretive effect of DRIP issuance (issuing shares above NAV per share) (in dollars per share) 0.12 0.14            
Other (in dollars per share) (0.04) (0.01)            
NAV as of the end of the period (in dollars per share) 34.22 32.78            
Market value as of the end of the period (in dollars per share) $ 55.05 $ 63.59            
Shares outstanding as of the end of the period (in shares) 93,744,192 89,536,504            
NAV as of the end of the period $ 3,207,678 $ 2,934,575 $ 3,166,538 $ 3,093,644 $ 2,993,893 $ 2,884,217 $ 2,840,133 $ 2,797,838
Average NAV 3,115,438 2,864,191            
Average outstanding debt $ 2,549,600 $ 2,211,100            
Ratios to average NAV:                
Ratio of total expenses, including income tax expense, to average NAV 6.16% 5.92%            
Ratio of operating expenses to average NAV 5.30% 5.17%            
Ratio of operating expenses, excluding interest expense, to average NAV 1.78% 1.82%            
Ratio of net investment income to average NAV 8.30% 9.10%            
Portfolio turnover ratio 12.87% 15.72%            
Total investment return (3.31%) 14.47%            
Total return based on change in NAV 10.48% 12.95%            
Related Party | External Investment Manager                
Ratios to average NAV:                
Total expenses $ 17,900 $ 17,000