Quarterly report pursuant to Section 13 or 15(d)

Financial Highlights (Details)

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Financial Highlights (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Per share data        
Net asset value at beginning of period (in dollars per share) $ 11.43 $ 10.53    
Total from investment operations (in dollars per share) 0.57 0.70    
Net increase in net assets from capital share transactions (in dollars per share) 0.09 0.05    
Distributions of net investment income (in dollars per share) (0.48) (0.48)    
Stock-based compensation expense included in net investment income and other movements (in dollars per share) 0.02 0.02    
Net asset value at ending of period (in dollars per share) 11.63 10.82    
Ratios and supplemental data:        
Per share market value at end of period (in dollars per share) $ 18.45 $ 12.89    
Total return 13.57% 0.80%    
Shares outstanding at end of period (in shares) 162,230 138,596    
Basic weighted average common shares outstanding (in shares) 157,445 135,252    
Net assets at end of period $ 1,885,938 $ 1,499,006 $ 1,802,706 $ 1,401,459
Ratio of total expense to average net assets 9.32% 10.94%    
Ratio of net investment income before investment gains and losses to average net assets 17.40% 18.10%    
Portfolio turnover rate 4.83% 6.90%    
Weighted average debt outstanding $ 1,635,890 $ 1,604,533    
Weighted average debt per common share (in dollars per share) $ 10.39 $ 11.86    
Net Investment Income        
Per share data        
Net gain (loss) (in dollars per share) 0.50 0.48    
Realized        
Per share data        
Net gain (loss) (in dollars per share) 0.05 0.06    
Unrealized        
Per share data        
Net gain (loss) (in dollars per share) $ 0.02 $ 0.16