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Employee Benefit Plans: Fair Value Employee Benefit Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Beginning fair value of plan assets $ 458,387 $ 473,721 $ 473,721
Investment income (loss) (98,585) 20,165  
Employer contributions 0 0 0
Retiree contributions 0 0  
Defined Benefit Plan, Plan Assets, Benefits Paid (36,661) (35,499)  
Ending fair value of plan assets 323,141 458,387 323,141
Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Beginning fair value of plan assets 0 0 0
Investment income (loss) 0 0  
Employer contributions 3,061 2,576  
Retiree contributions 0 0  
Defined Benefit Plan, Plan Assets, Benefits Paid (3,061) (2,576)  
Ending fair value of plan assets 0 0 0
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Beginning fair value of plan assets 7,972 8,165 8,165
Investment income (loss) 4 (35)  
Employer contributions 4,488 4,726  
Retiree contributions 1,419 1,548  
Defined Benefit Plan, Plan Assets, Benefits Paid (6,131) (6,432)  
Ending fair value of plan assets $ 7,752 $ 7,972 $ 7,752