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Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Derivative [Line Items]      
Regulatory assets $ 561,869   $ 652,981
Regulatory liabilities 577,061   518,573
Gas price derivatives      
Derivative [Line Items]      
Regulatory assets 0   $ 8,793
Regulatory liabilities 100    
Not Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (3,094) $ 3,494  
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  
Not Designated as Hedging Instrument | Natural Gas      
Derivative [Line Items]      
Derivative, Loss on Derivative $ (3,094)    
Derivative, 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  
Derivative, Gain on Derivative   $ 3,494