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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 138 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, 2023
Sep. 21, 2021
Sep. 20, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in net assets from operations:                                  
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 (loss) gain on investments                 (31,927) (32,747) 843            
Net realized loss on foreign currency                 0 (3) (3)            
Net change in unrealized appreciation (depreciation) on investments                 22,219 (5,314) 43,617            
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            
Changes in net assets from shareholders' distributions:                                  
Net decrease in net assets resulting from shareholders' distributions                 (87,867) (81,575) (71,530)            
Changes in net assets from capital share transactions:                                  
Reinvestment of shareholders' distributions                 0 0 15,489            
Repurchase of common stock                 (11,518) (15,444) (10,467) $ (259,392)          
Net (decrease) increase in net assets resulting from capital share transactions                 (11,518) (15,444) 5,022            
Total (decrease) increase in net assets                 (4,071) (46,878) 52,256            
Net assets at beginning of year       $ 883,634       $ 930,512 883,634 930,512 878,256            
Net assets at end of year $ 879,563       $ 883,634       $ 879,563 $ 883,634 $ 930,512 $ 879,563          
Net asset value per share of common stock at end of year (in dollars per share) $ 16.23 [1] $ 15.80 $ 15.31 $ 15.11 $ 15.98 [1] $ 16.26 $ 15.89 $ 16.20 $ 16.23 [1] $ 15.98 [1] $ 16.34 [1] $ 16.23 [1]     $ 15.50 [1] $ 16.80 $ 17.38
Shares of common stock outstanding at end of year (in shares) 54,184,636 [1]       55,299,484 [1]       54,184,636 [1] 55,299,484 [1] 56,958,440 [1] 54,184,636 [1] 56,958,440 113,916,869 56,646,867 56,690,578  
[1] As discussed in Note 3, the Company completed a two-to-one reverse stock split, effective as of September 21, 2021. The shares outstanding used in the computation of net asset value per share for 2021 reflect the reverse stock split on a retroactive basis.