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Risk Management And Derivatives: Derivatives Not Designated as Hedge Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Regulatory assets | $ 796,599 | $ 278,258 |
Gas price derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Regulatory assets | 2,584 | 2,226 |
Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net | 2,455 | 1,784 | $ (1,100)
Not Designated as Hedging Instrument | Fuel, purchased power and cost of natural gas sold | Electricity |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net | (144) | 144 | 0
Not Designated as Hedging Instrument | Fuel, purchased power and cost of natural gas sold | Natural Gas |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 2,599 | $ 1,640 | $ (1,100)

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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 http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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