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Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Derivative [Line Items] |  |  |  |  |
Regulatory assets | $ 702,368 |  | $ 702,368 |  | $ 796,599
Gas price derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Regulatory assets | 4,845 |  | 4,845 |  | $ 2,584
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (2,332) | $ (1,782) | 1,162 | $ (2,940) |
Not Designated as Hedging Instrument | Fuel, purchased power and cost of natural gas sold | Electricity |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Loss on Derivative | 0 | 3,598 | 0 | 5,122 |
Not Designated as Hedging Instrument | Fuel, purchased power and cost of natural gas sold | Natural Gas |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Loss on Derivative | $ 2,332 |  |  |  |
Derivative, Gain on Derivative |  | $ 1,816 | $ 1,162 | $ 2,182 |

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