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FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights, Additional Information (Details) - $ / shares | 12 Months Ended |
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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 | Dec. 31, 2013 | Dec. 31, 2012
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional dividends declared (in dollars per share) | $ 0.12 |  |  | $ 0.08 |  |  |  | $ 0.05 | $ 0.05 | $ 0.05 |
Per share market value at end of period (in dollars per share) | 18.47 | $ 21.19 | $ 16.89 | 18.65 | $ 15.58 | $ 15.72 | $ 16.49 | 14.25 | 15.61 | 17.77 | $ 17.50
Total distributions to stockholders (in dollars per share) | $ 1.87 | $ 1.62 | $ 1.60 | $ 1.68 | $ 1.54 | $ 1.52 | $ 1.52 | $ 1.57 | $ 1.57 | $ 1.57 |
Ratio of operating expenses to average net assets | 10.19% | 13.05% | 10.27% | 9.92% | 8.63% | 9.45% | 9.59% | 9.51% | 10.46% | 10.03% |
Base management fees |  |  |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratio of operating expenses to average net assets | 3.27% | 3.14% | 3.10% | 2.78% | 2.49% | 2.57% | 2.64% | 2.55% | 2.51% | 2.40% |
Income based fees and capital gains incentive fees, net of the fee waiver |  |  |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratio of operating expenses to average net assets | 1.61% | 4.80% | 1.80% | 2.23% | 2.24% | 2.18% | 2.29% | 2.31% | 2.90% | 2.80% |
Income based fees and capital gains incentive fees excluding the fee waiver |  |  |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratio of operating expenses to average net assets | 1.61% | 4.80% | 1.80% | 2.64% | 2.79% | 2.32% | 2.29% | 2.31% | 2.90% | 2.80% |
Cost of borrowing |  |  |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratio of operating expenses to average net assets | 4.89% | 4.61% | 4.54% | 3.94% | 3.33% | 3.37% | 3.58% | 4.32% | 4.24% | 3.94% |
Other operating expenses |  |  |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratio of operating expenses to average net assets | 0.42% | 0.50% | 0.83% | 0.97% | 0.57% | 1.33% | 1.08% | 0.33% | 0.81% | 0.89% |

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