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BENEFIT PLANS: Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.