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Financial Highlights - Schedule of Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment Company, Financial Highlights [Line Items]                    
Net Asset Value Per Share, Beginning Balance $ 19.43 [1] $ 19.96 [1] $ 16.81 $ 16.85 $ 16.47 $ 16.05 $ 15.76 $ 15.17 $ 15.16 $ 15.35
Net investment income 2.47 1.9 1.03 1.62 1.31 1.43 1.44 1.45 1.64 1.62
Net realized gain (loss) on investments, net of tax (provision) 0.85 2.61 2.19 (0.06) (0.05) (0.45) 0.67 (0.77) 0.58 (1.18)
Taxes paid on deemed distributions   (0.35)                
Net unrealized appreciation (depreciation) on investments (0.39) (2.69) 1.7 (0.27) 0.74 1.05 (0.23) 1.59 (0.62) 0.92
Realized losses on extinguishment of debt   (0.01) (0.17) (0.01) (0.02) (0.01) (0.01)      
Total increase from investment operations 2.93 1.46 4.75 1.28 1.98 2.02 1.87 2.27 1.6 1.36
Accretive (dilutive) effect of share issuances and repurchases 0.02 0.02   0.01   0.01 0.02 (0.05) 0.02 0.19
Dividends declared to stockholders (2.37) (1.19) (1.6) (1.33) (1.6) (1.6) (1.6) (1.6) (1.6) (0.97)
Distributions from capital gains (0.51) (0.81)               (0.75)
Other (0.13) (0.01)       (0.01)   (0.03) (0.01) (0.02)
Net Asset Value Per Share, Ending Balance 19.37 [1] 19.43 [1] 19.96 [1] 16.81 16.85 16.47 16.05 15.76 15.17 15.16
Market value at end of period $ 19.69 $ 19.03 $ 17.98 $ 13.1 $ 14.84 $ 11.69 $ 15.18 $ 15.73 $ 13.69 $ 14.85
Shares outstanding at end of period 30,438,979 24,727,788 24,437,400 24,437,400 24,463,119 24,463,119 24,507,940 22,446,076 16,300,732 16,051,037
Weighted average number of shares outstanding - basic 26,365,269 24,468,172 24,437,400              
Weighted average number of shares outstanding - diluted 26,365,269 24,468,172 24,437,400 24,442,431 24,463,119 24,471,730 23,527,188 18,283,715 16,201,449 14,346,438
Net assets at end of period $ 589,474 $ 480,343 $ 487,764 $ 410,760 $ 412,310 $ 402,985 $ 393,273 $ 353,785 $ 247,362 $ 243,263
Average net assets $ 517,287 $ 482,594 $ 437,690 $ 392,866 $ 404,284 $ 398,440 $ 376,292 $ 289,453 $ 245,706 $ 222,737
Total expenses 12.90% 12.00% 15.40% 11.80% 11.20% 10.70% 9.80% 11.70% 11.30% 10.30%
Net investment income 12.60% 9.60% 5.70% 10.10% 7.90% 8.80% 9.00% 9.20% 10.80% 10.50%
Total return based on market value 17.80% 17.70% 53.90% 1.00% 37.60% (15.80%) 3.20% 23.80% 2.40% (23.80%)
Total return based on net asset value 15.10% 7.30% 28.30% 7.60% 12.00% 12.60% 11.90% 15.00% 10.60% 8.90%
Portfolio turnover ratio 28.30% 23.90% 47.70% 25.80% 17.20% 29.50% 29.50% 29.30% 22.50% 18.90%
Average debt outstanding $ 455,053 $ 397,244 $ 380,997 $ 385,350 $ 319,050 $ 271,560 $ 219,920 $ 221,200 $ 199,340 $ 152,700
Average debt per share $ 17.26 $ 16.24 $ 15.59 $ 15.77 $ 13.04 $ 11.1 $ 9.35 $ 12.1 $ 12.3 $ 10.64
[1] Net asset value per share is determined as of the last day in the relevant quarter and therefore may not reflect the net asset value per share on the date of the high and low sales prices. The net asset values shown are based on outstanding shares at the end of each period.