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BENEFIT PLANS: Defined Benefit Plan, Estimated Future Benefit Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2026
Dec. 31, 2025
Pension Plan    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Expected Future Benefit Payments in Year One   $ 53,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two   54,713
Defined Benefit Plan, Expected Future Benefit Payments in Year Three   56,371
Defined Benefit Plan, Expected Future Benefit Payments in Year Four   58,110
Defined Benefit Plan, Expected Future Benefit Payments in Year Five   59,898
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter   331,936
Senior Management Security Plan    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Expected Future Benefit Payments in Year One   6,855
Defined Benefit Plan, Expected Future Benefit Payments in Year Two   6,883
Defined Benefit Plan, Expected Future Benefit Payments in Year Three   7,079
Defined Benefit Plan, Expected Future Benefit Payments in Year Four   7,360
Defined Benefit Plan, Expected Future Benefit Payments in Year Five   7,438
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter   $ 37,939
Forecast | Pension Plan    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Minimum Funding Requirement for Next Fiscal Year $ 0