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Selected Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]                          
Investment income $ 57,894 $ 59,627 $ 61,357 $ 73,554 $ 59,999 $ 67,540 $ 58,496 $ 64,975          
Net investment income 18,686 21,618 22,963 32,593 21,758 29,990 23,416 29,858 $ 95,860 $ 105,022 $ 88,205    
Net realized and unrealized loss on investments and foreign currency (13,228) (21,997) (585) (26,148) 29,234 17,483 4,478 (60,903)          
Net (decrease) increase in net assets resulting from operations $ 5,458 $ (379) $ 22,378 $ 6,445 $ 50,992 $ 47,473 $ 27,894 $ (31,045) $ 33,902 $ 95,314 $ 50,141    
Net increase (decrease) in net assets resulting from operations per share of common stock (in dollars per share) $ 0.10 $ (0.01) $ 0.42 $ 0.12 $ 0.94 $ 0.87 $ 0.51 $ (0.56)          
Net asset value per share of common stock at end of quarter (in dollars per share) $ 15.43 $ 15.73 $ 16.08 $ 16.05 $ 16.23 $ 15.80 $ 15.31 $ 15.11 $ 0.09 $ 0.12 $ 0.20 $ 0 $ 0
Weighted average shares of common stock outstanding - basic (in shares) 53,268,577 53,439,316 53,595,624 53,960,698 54,292,065 54,561,367 54,788,740 55,109,482 53,564,788 54,685,327 56,556,510,000    
Weighted average shares of common stock outstanding - diluted (in shares) 53,268,577 53,439,316 53,595,624 53,960,698 54,292,065 54,561,367 54,788,740 55,109,482 53,564,788 54,685,327 56,556,510,000