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Selected Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                          
Investment income $ 59,999 $ 67,540 $ 58,496 $ 64,975 $ 55,500 $ 54,163 $ 43,552 $ 41,683          
Net investment income 21,758 29,990 23,416 29,858 23,877 25,557 19,288 19,483 $ 105,022 $ 88,205 $ 74,307    
Net realized and unrealized (loss) gain on investments and foreign currency 29,234 17,483 4,478 (60,903) (14,342) 8,426 (20,554) (11,594)          
Net increase in net assets resulting from operations $ 50,992 $ 47,473 $ 27,894 $ (31,045) $ 9,535 $ 33,983 $ (1,266) $ 7,889 $ 95,314 $ 50,141 $ 118,764    
Net increase (decrease) in net assets resulting from operations per share of common stock (in dollars per share) $ 0.94 $ 0.87 $ 0.51 $ (0.56) $ 0.17 $ 0.60 $ (0.02) $ 0.14          
Net asset value per share of common stock at end of quarter (in dollars per share)   $ 15.80 $ 15.31 $ 15.11 $ 15.98 $ 16.26 $ 15.89 $ 16.20 $ 0.12 $ 0.20 $ 0 $ 0 $ 0
Weighted average shares of common stock outstanding - basic (in shares) 54,292,065 54,561,367 54,788,740 55,109,482 55,505,248 56,816,992 56,958,440 56,958,440 54,685,327 [1] 56,556,510,000 [1] 56,808,960,000 [1]    
Weighted average shares of common stock outstanding - diluted (in shares) 54,292,065 54,561,367 54,788,740 55,109,482 55,505,248 56,816,992 56,958,440 56,958,440 54,685,327 [1] 56,556,510,000 [1] 56,808,960,000 [1]    
[1] As discussed in Note 3, the Company completed a two-to-one reverse stock split, effective as of September 21, 2021. The weighted average shares used in the computation of the net increase (decrease) in net assets per share resulting from operations and net investment income per share for 2021 reflect the reverse stock split on a retroactive basis.