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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost      
Net periodic benefit cost $ 5,986 $ 8,077 $ 6,513
Postretirement Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost      
Service cost 672 698 658
Interest cost 2,973 2,824 2,980
Expected return on plan assets (1,786) (1,831) (1,650)
Amortization of net loss (1,765) (1,494) (1,237)
Amortization of prior service cost 1,374 1,548 1,665
Net periodic benefit cost $ 1,468 $ 1,745 $ 2,416