Quarterly report [Sections 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, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Per share data        
Net asset value at beginning of period (in dollars per share) $ 12.13 $ 11.66    
Net investment income (in dollars per share) 0.48 0.45    
Net realized gain (loss) (in dollars per share) 0 (0.01)    
Net unrealized appreciation (depreciation) (in dollars per share) (0.25) (0.15)    
Total from investment operations (in dollars per share) 0.23 0.29    
Net increase (decrease) in net assets from capital share transactions (in dollars per share) (0.02) 0.04    
Distributions of net investment income (in dollars per share) (0.47) (0.47)    
Distributions of capital gains (in dollars per share) 0 0    
Stock-based compensation expense included in net investment income and other movements (in dollars per share) 0.03 0.03    
Net asset value at ending of period (in dollars per share) 11.90 11.55    
Ratios and supplemental data:        
Per share market value at end of period (in dollars per share) $ 14.77 $ 19.21    
Total return (19.06%) (2.03%)    
Shares outstanding at end of period (in shares) 187,174 173,285    
Weighted average shares outstanding (in shares) 182,760 171,494    
Net assets at end of period $ 2,226,995 $ 2,000,630 $ 2,216,053 $ 1,989,581
Ratio of total expense to average net assets 9.60% 8.33%    
Ratio of net investment income before investment gains and losses to average net assets 15.84% 15.35%    
Portfolio turnover rate 4.89% 3.40%    
Weighted average debt outstanding $ 2,420,380 $ 1,815,224    
Weighted average debt per common share (in dollars per share) $ 13.24 $ 10.58