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Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]      
Regulatory assets $ 652,981 $ 796,599  
Gas price derivatives      
Derivative [Line Items]      
Regulatory assets 8,793 2,584  
Not Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (797) $ 2,455 $ 1,784
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fuel, Purchased Power and Cost of Gas Sold Fuel, Purchased Power and Cost of Gas Sold Fuel, Purchased Power and Cost of Gas Sold
Not Designated as Hedging Instrument | Electricity      
Derivative [Line Items]      
Derivative, Loss on Derivative   $ (144)  
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]   Fuel, Purchased Power and Cost of Gas Sold  
Derivative, Gain on Derivative $ 0   $ 144
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Fuel, Purchased Power and Cost of Gas Sold   Fuel, Purchased Power and Cost of Gas Sold
Not Designated as Hedging Instrument | Natural Gas      
Derivative [Line Items]      
Derivative, Loss on Derivative $ (797)    
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Fuel, Purchased Power and Cost of Gas Sold    
Derivative, Gain on Derivative   $ 2,599 $ 1,640
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]   Fuel, Purchased Power and Cost of Gas Sold Fuel, Purchased Power and Cost of Gas Sold