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Employee Benefit Plans: Plan Contributions (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
Defined Benefit Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Employer Contributions in Next Fiscal Year $ 0
Payment for Pension Benefits 0
Estimated Future Employer Contributions in Current Fiscal Year 0
Other Postretirement Benefits Plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Employer Contributions in Next Fiscal Year 4,556
Payment for Pension Benefits 1,230
Estimated Future Employer Contributions in Current Fiscal Year 3,690
Supplemental Non-Qualified Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Estimated Future Employer Contributions in Next Fiscal Year 2,410
Payment for Pension Benefits 558
Estimated Future Employer Contributions in Current Fiscal Year $ 1,673