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BENEFIT PLANS: Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reclassification adjustments for: |  |  |
Unfunded pension liability adjustment, net of tax | $ 1,352 | $ (3,592) | $ 4,262
Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Actuarial (loss) gain during the year | 30,374 | 63,119 | (25,071)
Plan amendment service cost | 0 | 0 | 0
Reclassification adjustments for: |  |  |
Amortization of net loss | 0 | 1,700 | 0
Amortization of prior service cost | 6 | 6 | 6
Adjustment for deferred tax effects | (7,604) | (16,686) | 6,452
Adjustment due to the effects of regulation | 22,776 | 48,139 | (18,613)
Unfunded pension liability adjustment, net of tax | 0 | 0 | 0
Senior Management Security Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Actuarial (loss) gain during the year | (2,401) | 3,320 | (6,517)
Plan amendment service cost | (7) | (15) | (11)
Reclassification adjustments for: |  |  |
Amortization of net loss | 690 | 1,312 | 570
Amortization of prior service cost | 221 | 220 | 219
Adjustment for deferred tax effects | 145 | (1,245) | 1,477
Adjustment due to the effects of regulation | 0 | 0 | 0
Unfunded pension liability adjustment, net of tax | (1,352) | 3,592 | (4,262)
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Actuarial (loss) gain during the year | 619 | 3,616 | 7,572
Reclassification adjustments for: |  |  |
Amortization of prior service cost | 1,375 | 1,548 | 1,665
Adjustment for deferred tax effects | (57) | (945) | (2,059)
Adjustment due to the effects of regulation | 172 | 2,725 | 5,941
Unfunded pension liability adjustment, net of tax | $ 0 | $ 0 | $ 0

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