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Employee Benefit Plans: Employee Benefit Plan Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Pension Plan        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Projected benefit obligation at beginning of year $ 478,262 $ 514,008   $ 514,008
Service Cost 3,927 5,038 $ 5,411  
Interest cost 10,819 9,313 13,426  
Actuarial (gain) loss (97,960) (14,037)    
Amendments   (561)   0
Benefits paid (36,663) (35,499)    
Plan participants’ contributions 0 0    
Projected benefit obligation at end of year 358,385 478,262 514,008 358,385
Supplemental Employee Retirement Plan        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Projected benefit obligation at beginning of year 55,260 55,054   55,054
Service Cost (801) 3,149 1,579  
Interest cost 834 706 1,099  
Actuarial (gain) loss (7,007) (1,073)    
Amendments 0 0    
Benefits paid (3,061) (2,576)    
Plan participants’ contributions 0 0    
Projected benefit obligation at end of year 45,225 55,260 55,054 45,225
Other Postretirement Benefits Plan        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Projected benefit obligation at beginning of year 63,484 70,238   70,238
Service Cost 1,968 2,237 2,056  
Interest cost 1,285 1,058 1,649  
Actuarial (gain) loss (12,300) (5,165)    
Amendments 0 0    
Benefits paid (6,131) (6,432)    
Plan participants’ contributions 1,419 1,548    
Projected benefit obligation at end of year $ 49,725 $ 63,484 $ 70,238 $ 49,725