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Fair Value Measurements: Schedule of Fair Values (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
ContractSubjecttoMasterNetting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 800 $ 2,400
Derivative Liability, Fair Value, Gross Liability 800 1,800
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (806) (2,374)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (805) (1,814)
Fair Value, Measurements, Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 1,894 5,195
Derivative Liabilities, Total 4,719 1,459
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 0 0
Derivative Liabilities, Total 0 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 2,700 7,569
Derivative Liabilities, Total 5,524 3,273
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 0 0
Derivative Liabilities, Total 0 0
Fair Value, Measurements, Recurring | Gas Utilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (806) (2,374)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (805) (1,814)
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Commodity Derivatives 1,894 5,195
Derivative Liabilities, Fair Value Disclosure 4,719 1,459
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Commodity Derivatives 0 0
Derivative Liabilities, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Commodity Derivatives 2,700 7,569
Derivative Liabilities, Fair Value Disclosure 5,524 3,273
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Commodity Derivatives 0 0
Derivative Liabilities, Fair Value Disclosure $ 0 $ 0