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) |