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BENEFIT PLANS: Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification adjustments for: |  |  |  |
Unfunded pension liability adjustment, net of tax |  | $ 4,262 | $ (27,118) | $ (3,318)
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Actuarial (loss) gain during the year |  | (25,071) | 227,372 | 91,156
Plan amendment service cost |  | 0 | 0 | 0
Reclassification adjustments for: |  |  |  |
Amortization of net loss |  | 0 | 12,273 | 23,796
Amortization of prior service cost |  | 6 | 6 | 6
Adjustment for deferred tax effects |  | 6,452 | (61,686) | (29,590)
Adjustment due to the effects of regulation |  | 18,613 | (177,965) | (85,368)
Unfunded pension liability adjustment, net of tax |  | 0 | 0 | 0
Senior Management Security Plan |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Actuarial (loss) gain during the year |  | (6,517) | 32,009 | (33)
Plan amendment service cost |  | (11) | 0 | 0
Reclassification adjustments for: |  |  |  |
Amortization of net loss |  | 570 | 4,229 | 4,205
Amortization of prior service cost |  | 219 | 279 | 296
Adjustment for deferred tax effects |  | 1,477 | (9,399) | (1,150)
Adjustment due to the effects of regulation |  | 0 | 0 | 0
Unfunded pension liability adjustment, net of tax |  | (4,262) | 27,118 | 3,318
Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Actuarial (loss) gain during the year |  | 7,572 | 12,908 | 9,718
Plan amendment service cost |  | 0 | (8,065) | 0
Reclassification adjustments for: |  |  |  |
Immediate Recognition of loss from temporary deviation | [1] | 0 | 0 | 4,736
Amortization of prior service cost |  | 1,665 | 295 | 47
Adjustment for deferred tax effects |  | (2,059) | (1,315) | (2,514)
Adjustment due to the effects of regulation |  | (5,941) | (3,792) | (11,987)
Unfunded pension liability adjustment, net of tax |  | $ 0 | $ 0 | $ 0
[1] | In 2021, a loss associated with a temporary deviation from the cost-sharing provisions of the substantive plan was recognized in "Other (income) expense, net" on the consolidated statements of income of the companies.

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