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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | 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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 33,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends cash paid (in usd per share) |  | $ 0.63 | $ 0.64 | $ 0.63 | $ 0.63 | $ 0.63 | $ 0.62 | $ 0.59 | $ 0.58 | $ 0.57 | $ 0.50 | $ 0.63 | $ 0.48 | $ 2.53 | $ 2.42 | $ 2.18
Total distributions (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 92.89% | 94.17% |
Undistributed ordinary income - tax basis | $ 41,594 |  |  |  | $ 28,845 |  |  |  | $ 16,070 |  |  |  |  |  |  |
Cumulative undistributed taxable income (in usd per share) | $ 0.79 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments | $ 1,776,100 |  |  |  | 1,471,100 |  |  |  |  |  |  |  |  |  |  |
Gross unrealized appreciation | 117,400 |  |  |  | 96,300 |  |  |  |  |  |  |  |  |  |  |
Gross unrealized depreciation | 108,200 |  |  |  | 96,400 |  |  |  |  |  |  |  |  |  |  |
Net unrealized appreciation (depreciation) | 9,200 |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |
Total net deferred tax (liabilities) assets | (16,780) |  |  |  | $ (11,997) |  |  |  |  |  |  |  |  |  |  |
RIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments | 1,718,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized appreciation | 15,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized depreciation | 95,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized appreciation (depreciation) | (80,300) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of investments | 57,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized appreciation | 102,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross unrealized depreciation | 12,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized appreciation (depreciation) | $ 89,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total distributions (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 92.89% |  |
Regular Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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