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Employee Benefit Plans: Plan Contributions (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension Benefits $ 0 $ 0 $ 0
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension and Other Postretirement Benefits 6,131 6,432  
Payment for Pension Benefits 4,488 4,726  
Supplemental Non-Qualified Defined Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension Benefits 3,061 2,576  
Defined Contribution Plan, Company Retirement      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Discretionary Contribution Amount 11,885 11,332  
Defined Contribution Plan, 401K      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 16,187 $ 15,938