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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 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)     0.83 1.37        
Net increase (decrease) in net assets from capital share transactions (in dollars per share)     0.10 (0.01)        
Distributions of net investment income (in dollars per share)     (0.97) (0.96)        
Stock-based compensation expense included in net investment income and other movements (in dollars per share)     0.04 0.03        
Net asset value at ending of period (in dollars per share) $ 11.43 $ 10.96 11.43 10.96        
Ratios and supplemental data:                
Per share market value at end of period (in dollars per share) $ 20.45 $ 14.80 $ 20.45 $ 14.80        
Total return     28.84% 19.55%        
Shares outstanding at end of period (in shares) 162,428 144,641 162,428 144,641        
Weighted average shares outstanding (in shares) 160,748 141,390 159,096 138,338        
Net assets at end of period $ 1,856,545 $ 1,585,510 $ 1,856,545 $ 1,585,510 $ 1,885,938 $ 1,802,706 $ 1,499,006 $ 1,401,459
Ratio of total expense to average net assets     9.21% 10.75%        
Ratio of net investment income before investment gains and losses to average net assets     17.49% 18.95%        
Portfolio turnover rate     13.73% 17.20%        
Weighted average debt outstanding     $ 1,675,984 $ 1,614,522        
Weighted average debt per common share (in dollars per share)     $ 10.53 $ 11.69        
Net Investment Income                
Per share data                
Net gain (loss) (in dollars per share)     1.02 1.02        
Net realized gain (loss)                
Per share data                
Net gain (loss) (in dollars per share)     0.01 0.06        
Net unrealized appreciation (depreciation)                
Per share data                
Net gain (loss) (in dollars per share)     $ (0.20) $ 0.29