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Derivative Instruments - Schedule of Fair Value, Asset and Liability (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
MMBTU
Dec. 31, 2023
USD ($)
MMBTU
Derivatives, Fair Value [Line Items]    
Derivative assets $ 0 $ 0
Derivative Liability 543,000 617,000
CERC    
Derivatives, Fair Value [Line Items]    
Derivative assets 0 0
Derivative Liability 4,000 11,000
Derivatives not designated as hedging instruments:    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized 2,000 0
Derivative Liabilities Fair Value 7,000 12,000
Current Liabilities: Non-trading derivative liabilities 5,000 12,000
Derivatives not designated as hedging instruments: | CERC    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized 2,000 0
Derivative Liabilities Fair Value 6,000 11,000
Current Liabilities: Non-trading derivative liabilities $ 4,000 $ 11,000
Natural gas derivatives | Derivatives not designated as hedging instruments:    
Derivatives, Fair Value [Line Items]    
Derivative gross volume (in MMBtu) | MMBTU 32,251 27,421
Natural gas derivatives | Derivatives not designated as hedging instruments: | CERC    
Derivatives, Fair Value [Line Items]    
Derivative gross volume (in MMBtu) | MMBTU 27,644 23,504
Natural gas derivatives | Current Liabilities: Non-trading derivative liabilities | Derivatives not designated as hedging instruments:    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized $ 0 $ 0
Derivative Liabilities Fair Value 6,000 9,000
Current Liabilities: Non-trading derivative liabilities 4,000 9,000
Natural gas derivatives | Current Liabilities: Non-trading derivative liabilities | Derivatives not designated as hedging instruments: | CERC    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized 0 0
Derivative Liabilities Fair Value 5,000 8,000
Current Liabilities: Non-trading derivative liabilities 3,000 8,000
Natural gas derivatives | Other Liabilities: Non-trading derivative liabilities | Derivatives not designated as hedging instruments:    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized 0 0
Derivative Liabilities Fair Value 1,000 3,000
Current Liabilities: Non-trading derivative liabilities 1,000 3,000
Natural gas derivatives | Other Liabilities: Non-trading derivative liabilities | Derivatives not designated as hedging instruments: | CERC    
Derivatives, Fair Value [Line Items]    
Gross Amounts Recognized 0 0
Derivative Liabilities Fair Value 1,000 3,000
Current Liabilities: Non-trading derivative liabilities $ 1,000 $ 3,000