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Employee Benefit Plans: Accumulated Benefit Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Benefit Obligation $ 350,187 $ 466,505
Supplemental Employee Retirement Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Benefit Obligation 45,225 55,260
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Benefit Obligation $ 49,725 $ 63,484