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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
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Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  | $ 20,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) |  |  |  | $ 0.58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undistributed ordinary income - tax basis |  |  |  | $ 16,070 |  |  |  | $ 12,682 |  |  |  | $ 21,083 |  |  |  |  | $ 16,070 |  | $ 12,682 |  | $ 21,083 |
Cumulative undistributed taxable income (in usd per share) |  |  |  | $ 0.45 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.45 |  |  |  |  |
Cost of investments |  |  |  | $ 1,210,800 |  |  |  | 852,400 |  |  |  |  |  |  |  |  | $ 1,210,800 |  | 852,400 |  |  |
Gross unrealized appreciation |  |  |  | 72,300 |  |  |  | 67,800 |  |  |  |  |  |  |  |  | 72,300 |  | 67,800 |  |  |
Gross unrealized depreciation |  |  |  | (76,800) |  |  |  | (61,700) |  |  |  |  |  |  |  |  | (76,800) |  | (61,700) |  |  |
Net unrealized appreciation (depreciation) |  |  |  | (4,500) |  |  |  | 6,100 |  |  |  |  |  |  |  |  | (4,500) |  | 6,100 |  |  |
Deferred tax liability |  |  |  | 12,117 |  |  |  | $ 5,747 |  |  |  |  |  |  |  |  | 12,117 |  | 5,747 |  |  |
Income tax provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 329 |  | 615 |  | 2,442 |
Excise tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 630 |  | 65 |  | 637 |
Dividends cash paid (in usd per share) |  |  |  |  | $ 0.57 | $ 0.50 | $ 0.63 | $ 0.48 | $ 0.97 | $ 0.54 | $ 0.53 | $ 0.52 | $ 0.51 | $ 0.51 | $ 0.51 | $ 0.51 |  | $ 2.18 |  | $ 2.56 |  | $ 2.04
RIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments |  |  |  | 1,172,700 |  |  |  |  |  |  |  |  |  |  |  |  | 1,172,700 |  |  |  |  |
Gross unrealized appreciation |  |  |  | 10,500 |  |  |  |  |  |  |  |  |  |  |  |  | 10,500 |  |  |  |  |
Gross unrealized depreciation |  |  |  | (72,300) |  |  |  |  |  |  |  |  |  |  |  |  | (72,300) |  |  |  |  |
Net unrealized appreciation (depreciation) |  |  |  | (61,800) |  |  |  |  |  |  |  |  |  |  |  |  | (61,800) |  |  |  |  |
Taxable Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments |  |  |  | 38,100 |  |  |  |  |  |  |  |  |  |  |  |  | 38,100 |  |  |  |  |
Gross unrealized appreciation |  |  |  | 61,800 |  |  |  |  |  |  |  |  |  |  |  |  | 61,800 |  |  |  |  |
Gross unrealized depreciation |  |  |  | (4,500) |  |  |  |  |  |  |  |  |  |  |  |  | (4,500) |  |  |  |  |
Net unrealized appreciation (depreciation) |  |  |  | $ 57,300 |  |  |  |  |  |  |  |  |  |  |  |  | 57,300 |  |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (300) |  | $ 500 |  | $ 1,800 |
Regular dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) |  |  |  | $ 0.53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends cash paid (in usd per share) | $ 0.52 | $ 0.48 | $ 0.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-related Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ordinary distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89.74% |  | 87.40% |  |
Non-U.S. residents and foreign corporation shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ordinary distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89.74% |  | 87.40% |  |
Supplemental dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) |  |  |  | $ 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends cash paid (in usd per share) | $ 0.05 |  | $ 0.50 |  |  |  |  |  |  | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 |  |  |  |  |  |

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