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Financial Highlights - Schedule of Financial Highlights (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment Company, Financial Highlights [Line Items]          
Per share NAV at beginning of period $ 14.36 $ 13.24 $ 13.21 $ 14.13 $ 14.80
Net investment income before income taxes 1.53 1.26 1.43 1.61 1.59
Excise taxes 0 0 0 0 0.00
Net investment income 1.53 1.26 1.43 1.61 1.59
Net realized and unrealized gain (loss) (1.69) 1.17 (0.16) (1.09) (0.82)
Total from investment operations (0.16) 2.43 1.27 0.52 0.77
Repurchase of common stock 0 0 0.12 0 0
Loss on extinguishment of debt 0 (0.11) (0.04) 0 0
Ordinary income dividends (1.27) (1.20) (1.13) (1.40) (1.44)
Tax basis returns of capital (0.00) (0.23) (0.19) (0.04) (0.00)
Dividends to common shareholders (1.27) (1.20) (1.32) (1.44) (1.44)
Per share NAV at end of period 12.93 14.36 13.24 13.21 14.13
Per share market price at end of period $ 12.94 $ 13.51 $ 11.24 $ 14.05 $ 13.04
Total return based on market value 5.20% 30.90% (10.60%) 18.80% (5.20%)
Total return based on net asset value (1.10%) 17.50% 10.20% 3.70% 5.20%
Balance (Shares) 57,767,264 57,767,264 57,767,264 58,766,426 58,774,607
Net investment income 10.80% 9.00% 11.30% 11.60% 10.80%
Expenses before incentive fee 9.00% 9.30% 10.00% 9.80% 8.50%
Expenses and incentive fee 11.30% 11.50% 12.10% 12.30% 11.20%
Ending common shareholder equity $ 746,753,790 $ 829,456,636 $ 764,986,578 $ 776,318,386 $ 830,474,727
Portfolio turnover rate 19.40% 35.60% 28.30% 35.90% 32.30%
Weighted-average debt outstanding $ 1,023,880,532 $ 985,506,056 $ 936,157,021 $ 902,977,493 $ 769,065,775
Weighted-average interest rate on debt 3.50% 3.60% 3.90% 4.60% 4.60%
Weighted-average number of common shares 57,767,264 57,767,264 57,991,233 58,766,362 58,815,216
Weighted-average debt per share $ 17.72 $ 17.06 $ 16.14 $ 15.37 $ 13.08
Asset Coverage:          
Debt outstanding $ 949,062,241 $ 1,019,339,449 $ 856,324,371 $ 915,514,071 $ 812,007,389
Asset coverage per $1,000 of debt outstanding $ 1,929 $ 1,948 $ 2,058 $ 1,992 $ 2,157
Cumulative Effect Adjustment for the Adoption | ASU 2020-06          
Investment Company, Financial Highlights [Line Items]          
Per share NAV at beginning of period $ 0 $ 0 $ 0 $ 0  
Per share NAV at end of period $ 0.00 $ 0 $ 0 $ 0 $ 0
Ending common shareholder equity $ (113,089)