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Fair Value Measurements: Schedule of Fair Values (Details) - USD ($)
$ in Thousands
Sep. 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 $ 5,100 $ 4,300
Derivative Liability, Fair Value, Gross Liability 2,600 4,800
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 (5,057) (4,290)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (2,598) (4,837)
Fair Value, Measurements, Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 126 1,117
Derivative Liabilities, Total 2,211 6,618
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 5,183 5,407
Derivative Liabilities, Total 4,809 11,455
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 (5,057) (4,290)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset 2,598 (4,837)
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 126 1,117
Derivative, Liabilities, Fair Value Disclosure 2,211 6,618
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 5,183 5,407
Derivative, Liabilities, Fair Value Disclosure 4,809 11,455
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