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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | 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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 28,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends cash paid (in usd per share) |  | $ 0.63 | $ 0.62 | $ 0.59 | $ 0.58 | $ 0.57 | $ 0.50 | $ 0.63 | $ 0.48 | $ 0.97 | $ 0.54 | $ 0.53 | $ 0.52 | $ 2.42 | $ 2.18 | $ 2.56
Undistributed ordinary income - tax basis | $ 28,845 |  |  |  | $ 16,070 |  |  |  | $ 12,682 |  |  |  |  |  |  |
Cumulative undistributed taxable income (in usd per share) | $ 0.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments | $ 1,471,100 |  |  |  | 1,210,800 |  |  |  |  |  |  |  |  |  |  |
Gross unrealized appreciation | 96,300 |  |  |  | 72,300 |  |  |  |  |  |  |  |  |  |  |
Gross unrealized depreciation | 96,400 |  |  |  | 76,800 |  |  |  |  |  |  |  |  |  |  |
Net unrealized appreciation (depreciation) | (100) |  |  |  | (4,500) |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability | 11,997 |  |  |  | $ 12,117 |  |  |  |  |  |  |  |  |  |  |
RIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments | 1,425,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized appreciation | 16,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized depreciation | 85,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized appreciation (depreciation) | (68,500) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments | 45,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized appreciation | 79,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized depreciation | 11,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized appreciation (depreciation) | $ 68,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regular Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends cash paid (in usd per share) |  |  |  |  |  |  |  | $ 0.48 |  | 0.47 |  |  |  |  |  |
Supplemental Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends cash paid (in usd per share) |  | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.05 | $ 0.05 |  |  |  | $ 0.50 | $ 0.10 | $ 0.10 | $ 0.10 |  |  |
Interest-related Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ordinary distributions |  |  |  |  |  |  |  |  |  |  |  |  |  | 94.17% | 89.74% |
Non-U.S. residents and foreign corporation shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ordinary distributions |  |  |  |  |  |  |  |  |  |  |  |  |  | 94.17% | 89.74% |

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