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Risk Management and Derivatives: Derivatives by Balance Sheet Classification (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Not Offset Against Collateral $ (545) $ (1,387)
Commodity Contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (942) (4,114)
Derivative assets, current | Commodity Contract | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 118
Derivative assets, current | Commodity Contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 153 464
Other assets, non-current | Commodity Contract | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 198
Derivative Liability, Fair Value, Gross Liability (2)  
Other assets, non-current | Commodity Contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 111 337
Derivative liabilities, current | Commodity Contract | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (543) (1,703)
Derivative liabilities, current | Commodity Contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability (1,186) (4,897)
Other deferred credits and other liabilities | Commodity Contract | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ (20) $ (18)