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Fair Value Measurements: Schedule of Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 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   $ 4,300
Derivative Liability, Fair Value, Gross Liability   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 $ 0 (4,290)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset 0 (4,837)
Fair Value, Measurements, Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Total 264 1,117
Derivative Liabilities, Total 1,751 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 264 5,407
Derivative Liabilities, Total 1,751 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 0 (4,290)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset 0 (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 264 1,117
Derivative, Liabilities, Fair Value Disclosure 1,751 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 264 5,407
Derivative, Liabilities, Fair Value Disclosure 1,751 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