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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

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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