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BENEFIT PLANS: Schedule of Defined Benefit Plan Disclosures, Other Postretirment Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in Fair Value of Plan Assets [Roll Forward]      
Employer contributions $ (9,800) $ (8,800) $ (8,200)
Supplemental Unemployment Benefits, Disability Related Benefits 3,000 3,000  
Postretirement Benefits      
Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 59,099 74,075  
Service cost 658 1,071 1,063
Interest cost 2,980 2,112 2,059
Actuarial loss (gain) (2,004) (21,845)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid [1] (4,669) (4,379)  
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment 0 8,065  
Projected benefit obligation at December 31 56,064 59,099 74,075
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at January 1 28,565 [2] 41,464  
Actual return (loss) on plan assets 7,219 (6,586)  
Employer contributions [1] (690) (1,934)  
Benefits Paid [1] (4,670) (4,379)  
Fair value at December 31 31,804 [2] 28,565 [2] $ 41,464
Funded status at end of year (24,260) (30,534)  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant $ 2,600 $ 2,900  
Postretirement Benefit, Medical trend rate EY 7.10% 6.70%  
[1] Contributions and benefits paid are each net of $2.6 million and $2.9 million of plan participant contributions for 2023 and 2022, respectively.
[2] The postretirement benefits assets are primarily life insurance contracts.