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BENEFIT PLANS: Defined Benefit Plan, Net Periodic Benefit Cost, Other Postretirement Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost      
Net periodic benefit cost [1] $ 6,513 $ 9,196 $ 15,249
Postretirement Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost      
Service cost 658 1,071 1,063
Interest cost 2,980 2,112 2,059
Expected return on plan assets (1,650) (2,351) (2,395)
Immediate Recognition of loss from temporary deviation [2] 0 0 4,736
Amortization of net loss (1,237) (31) 0
Amortization of prior service cost 1,665 295 47
Net periodic benefit cost $ 2,416 $ 1,096 $ 5,510
[1] The 2021 pension and postretirement non-service costs includes $4.7 million of expense for a temporary deviation from the cost-sharing provisions of the substantive postretirement plan as described in Note 11 - "Benefit Plans."
[2] 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.