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Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Derivative [Line Items] |  |  |  |  |
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Fuel, purchased power and cost of natural gas sold | Fuel, purchased power and cost of natural gas sold |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Fuel, purchased power and cost of natural gas sold | Fuel, purchased power and cost of natural gas sold |
Regulatory assets | $ 706,206 |  | $ 706,206 |  | $ 796,599
Gas price derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Regulatory assets | 10,776 |  | 10,776 |  | $ 2,584
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 1,617 | $ 6,498 | 2,779 | $ 3,558 |
Not Designated as Hedging Instrument | Electricity |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Loss on Derivative |  |  | 0 | 2,628 |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |
Derivative, Gain on Derivative | $ 0 | $ 2,494 |  |  |
Not Designated as Hedging Instrument | Natural Gas |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Fuel, purchased power and cost of natural gas sold | Fuel, purchased power and cost of natural gas sold |  |  |
Derivative, Gain on Derivative | $ 1,617 | $ 4,004 | $ 2,779 | $ 6,186 |

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