XML 60 R48.htm IDEA: XBRL DOCUMENT v3.23.2
Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Derivative [Line Items]          
Regulatory assets $ 523,671   $ 523,671   $ 652,981
Regulatory liabilities 571,488   571,488   518,573
Gas price derivatives          
Derivative [Line Items]          
Regulatory assets 0   0   $ 8,793
Regulatory liabilities 100   100    
Not Designated as Hedging Instrument          
Derivative [Line Items]          
Derivative, Gain (Loss) on Derivative, Net $ 394 $ (2,332) $ (2,700) $ 1,162  
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 Fuel, Purchased Power and Cost of Gas Sold  
Not Designated as Hedging Instrument | Natural Gas          
Derivative [Line Items]          
Derivative, Loss on Derivative   $ (2,332) $ (2,700)    
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 Fuel, Purchased Power and Cost of Gas Sold Fuel, Purchased Power and Cost of Gas Sold  
Derivative, Gain on Derivative $ 394     $ 1,162