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Employee Benefit Plans: Components of Net Periodic Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost $ 3,927 $ 5,038 $ 5,411
Interest cost $ 10,819 $ 9,313 $ 13,426
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Expected return on assets $ (18,523) $ (20,876) $ (22,591)
Net amortization of prior service cost (68) 0 0
Recognized net actuarial loss (gain) 6,092 7,315 8,372
Net periodic benefit expense 2,247 790 4,618
Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost (801) 3,149 1,579
Interest cost $ 834 $ 706 $ 1,099
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Expected return on assets $ 0 $ 0 $ 0
Net amortization of prior service cost 0 0 2
Recognized net actuarial loss (gain) 276 1,754 1,702
Net periodic benefit expense 309 5,609 4,382
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 1,968 2,237 2,056
Interest cost $ 1,285 $ 1,058 $ 1,649
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Expected return on assets $ (125) $ (136) $ (182)
Net amortization of prior service cost (289) (434) (546)
Recognized net actuarial loss (gain) 64 466 20
Net periodic benefit expense $ 2,903 $ 3,191 $ 2,997