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Financial Highlights and Senior Securities (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]        
Net asset value, beginning of period (in usd per share) $ 26.66 $ 25.93    
Net investment income (in usd per share) 0.87 0.93    
Net unrealized and realized gain (loss) (in usd per share) 0.09 (0.06)    
Net increase (decrease) in net assets resulting from operations (in usd per share) 0.96 0.87    
Distributions declared (in usd per share) (0.77) (0.70)    
Net increase (decrease) in net assets from capital share transactions (in usd per share) 0.02 0    
Total increase (decrease) in net assets (in usd per share) 0.21 0.17    
Net asset value, ending of period (in usd per share) $ 26.87 $ 26.10    
Shares outstanding end of period (in shares) 191,874,419 160,571,371 185,782,408  
Total return based on NAV 3.40% 3.40%    
Total return based on market value 15.90% 14.30%    
Ratios:        
Ratio of net expenses to average net assets 10.70% 11.70%    
Ratio of net investment income to average net assets 12.80% 13.40%    
Portfolio turnover rate 1.80% 1.10%    
Supplemental Data:        
Total net assets $ 5,155,665 $ 4,190,496 $ 4,952,041 $ 4,158,966
Asset coverage ratio 197.30% 176.40% 200.30%  
Ratio of expenses to average net assets, before waivers 10.70% 11.90%    
Ratio of expenses to average net assets, waivers 0.00% (0.30%)