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Employee Benefit Plans: Plan Contributions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension Benefits $ 0 $ 12,700 $ 12,700
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension Benefits 0 12,700  
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 3,900    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension and Other Postretirement Benefits 6,432 6,058  
Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension and Other Postretirement Benefits 2,576 2,674  
Defined Contribution Plan, Company Retirement      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Discretionary Contribution Amount 11,332 10,455  
Defined Contribution Plan, 401K      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 15,938 $ 15,240