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Fair Value Measurements: Schedule of Fair Values (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Current Derivative Asset, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Current Derivative Liability, Current
Contract Subject to Master Netting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 800,000 $ 4,300,000
Derivative Liability, Fair Value, Gross Liability 0 4,800,000
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 (751,000) (4,290,000)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (25,000) (4,837,000)
Fair Value, Measurements, Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 303,000 1,117,000
Derivative Liabilities, Total 470,000 6,618,000
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 1,054,000 5,407,000
Derivative Liabilities, Total 495,000 11,455,000
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 (751,000) (4,290,000)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (25,000) (4,837,000)
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 303,000 1,117,000
Derivative, Liabilities, Fair Value Disclosure 470,000 6,618,000
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, Fair Value Disclosure 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, Fair Value Disclosure 1,054,000 5,407,000
Derivative, Liabilities, Fair Value Disclosure 495,000 11,455,000
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, Fair Value Disclosure 0 0
Derivative, Liabilities, Fair Value Disclosure $ 0 $ 0