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INCOME TAXES (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2026 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Reduction in income tax expense for the amortization of the regulatory liability associated with excess ADIT that was returned to customers |  | $ 3,300 | $ 2,100 | $ 12,800 | $ 10,200 |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) |  | 9,982 | $ 7,115 | 36,446 | $ 33,016 |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Deferred income taxes |  | $ 1,012,944 |  | $ 1,012,944 |  | $ 963,874
IRS 2022 Federal Income Tax Return | $ 64,300 |  |  |  |  |
IRS 2022 Income Tax Return, Federal Income Tax | 55,600 |  |  |  |  |
IRS 2022 Income Tax Return, Interest | $ 8,700 |  |  |  |  |

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