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Risk Management and Derivatives: Derivatives by Balance Sheet Classification (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ (3,060) | $ 2,035
Commodity Contract | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 236 | 1,701
Derivative assets, current | Commodity Contract | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 2 | 2,017
Derivative assets, current | Commodity Contract | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 714 | 2,356
Other assets, non-current | Commodity Contract | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 256 | 18
Other assets, non-current | Commodity Contract | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 923 | 804
Derivative liabilities, current | Commodity Contract | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | (3,318) | 0
Derivative liabilities, current | Commodity Contract | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | (1,401) | (1,439)
Other deferred credits and other liabilities | Commodity Contract | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | $ 0 | $ (20)

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