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Selected Quarterly Financial Data (unaudited) - Schedule of Selected Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Selected Quarterly Financial Information [Abstract]        
Total investment income $ 62,348 $ 70,965 $ 128,522 $ 137,804
Net investment income before taxes 29,337 31,666 57,607 64,852
Income tax expense, including excise tax 732 1,076 1,638 2,152
Net investment income after taxes 28,605 30,590 55,969 62,700
Net realized and unrealized gain (loss) (14,550) (6,868) (38,524) (10,431)
Net increase in net assets resulting from operations $ 14,055 $ 23,722 $ 17,445 $ 52,269
Net realized and unrealized gain (loss) per share - basic and diluted [1],[2]     $ (0.48) $ (0.36)
Basic increase in net assets resulting from operations per share of common stock $ 0.22 $ 0.37 0.27 0.81
Diluted increase in net assets resulting from operations per share of common stock 0.22 0.37 0.27 0.81
Net asset value at end of period $ 16.65 $ 17.56 $ 16.65 $ 17.56
[1] Net realized gain (loss) includes net realized gain (loss) on investments, net realized gain (loss) on forward currency exchange contracts, net realized gain (loss) on foreign currency transactions, and net realized gain (loss) on extinguishment of debt.
[2] The per share data was derived by using the weighted average shares outstanding during the period.