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Short-term Debt (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 17, 2023
Jan. 20, 2023
Dec. 31, 2022
Short-Term Debt [Line Items]          
Short-term borrowings $ 501,500 $ 99,958     $ 246,500
Repayment of short-term borrowings 20,000 $ 0      
Term Loan Agreement | Cascade Natural Gas [Member]          
Short-Term Debt [Line Items]          
Short-term borrowings       $ 150,000  
Ratio of total debt to total capitalization as specified in debt covenants       65.00%  
Term Loan Agreement | Intermountain Gas Company          
Short-Term Debt [Line Items]          
Short-term borrowings       $ 125,000  
Ratio of total debt to total capitalization as specified in debt covenants       65.00%  
Repayment of short-term borrowings $ 20,000        
Term Loan Agreement | Centennial Energy Holdings, Inc.          
Short-Term Debt [Line Items]          
Short-term borrowings     $ 100,000    
Ratio of total debt to total capitalization as specified in debt covenants     65.00%