v3.26.1
Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Per share data:      
Net asset value attributable to common stock, beginning of period (in dollars per share) $ 13.58 $ 14.10  
Results of operations      
Net investment income (loss) (in dollars per share) 0.27 0.33  
Net realized and unrealized gain (loss) on investments, net of change in deferred taxes (in dollars per share) (0.13) (0.15)  
Net realized and unrealized gain (loss) on derivatives (in dollars per share) 0.01 0.01  
Net increase (decrease) in net assets resulting from operations attributable to common stockholders and participating securities (in dollars per share) 0.14 0.18  
Accretion to redemption value of Series A redeemable convertible preferred stock (in dollars per share) 0.01 0.01  
Accrual of Series A redeemable convertible preferred stock distributions (in dollars per share) (0.01) (0.01)  
Net increase (decrease) in net assets resulting from operations attributable to common stockholders (in dollars per share) 0.13 0.17  
Stockholder distributions      
Common stockholder distributions from net investment income (in dollars per share) (0.24) (0.33)  
Net decrease in net assets resulting from stockholder distributions (in dollars per share) (0.24) (0.33)  
Net asset value attributable to common stock, end of period (in dollars per share) $ 13.47 $ 13.94  
Common shares outstanding at end of year (in shares) 135,982,568 136,196,142 135,487,319
Total return 0.94% 1.19%  
Ratio/Supplemental data attributable to common stock:      
Total net assets attributable to common stock, end of period $ 1,831,650 $ 1,898,833  
Ratio of net investment income to average net assets attributable to common stock 9.31% 11.01%  
Ratio of total expenses to average net assets attributable to common stock 12.38% 11.89%  
Ratio of total net expenses to average net assets attributable to common stock 12.38% 11.89%  
Portfolio turnover rate 5.95% 7.17%