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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025
Income Tax Contingency [Line Items] |  |  |
Dividends | $ 36,000 | $ 35,300 | $ 33,700
Dividends declared (in usd per share) |  | $ 0.64 | $ 0.64
Cost of investments | 1,885,000 |  | $ 1,776,100
Gross unrealized appreciation | 112,300 |  | 117,400
Gross unrealized depreciation | 127,100 |  | 108,200
Net unrealized appreciation (depreciation) | (14,800) |  | 9,200
Total net deferred tax (liabilities) assets | (14,861) |  | $ (16,780)
RIC |  |  |
Income Tax Contingency [Line Items] |  |  |
Cost of investments | 1,833,000 |  |
Gross unrealized appreciation | 18,900 |  |
Gross unrealized depreciation | 114,100 |  |
Net unrealized appreciation (depreciation) | (95,200) |  |
Taxable Subsidiary |  |  |
Income Tax Contingency [Line Items] |  |  |
Cost of investments | 52,000 |  |
Gross unrealized appreciation | 93,400 |  |
Gross unrealized depreciation | 13,000 |  |
Net unrealized appreciation (depreciation) | $ 80,400 |  |
O 2025 Q4 Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) |  |  | $ 0.58
S 2025 Q4 Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) |  |  | $ 0.06
O 2026 Q1 Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) |  | 0.58 |
S 2026 Q1 Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) |  | $ 0.06 |
O 2025 M1 Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) | $ 0.1934 |  |
O 2025 M2 Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) | 0.1934 |  |
O 2025 M3 Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) | 0.1934 |  |
O 2025 Q3 Supplemental Dividends |  |  |
Income Tax Contingency [Line Items] |  |  |
Dividends declared (in usd per share) | $ 0.06 |  |

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