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Derivative Instruments - Schedule of Derivative Activity (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
MMBTU
Dec. 31, 2023
USD ($)
MMBTU
Derivative Assets Fair Value    
Derivative assets $ 0 $ 0
Derivative Liability [Abstract]    
Derivative Liability 543,000 617,000
Derivatives not designated as hedging instruments:    
Derivative Assets Fair Value    
Gross Amounts Recognized 2,000 0
Derivative Liability [Abstract]    
Current Liabilities: Non-trading derivative liabilities $ 5,000 $ 12,000
Natural gas derivatives | Derivatives not designated as hedging instruments:    
Derivative Liability [Abstract]    
Derivative gross volume (in MMBtu) | MMBTU 32,251 27,421
Current Liabilities: Non-trading derivative liabilities | Natural gas derivatives | Derivatives not designated as hedging instruments:    
Derivative Assets Fair Value    
Gross Amounts Recognized $ 0 $ 0
Derivative Liability [Abstract]    
Current Liabilities: Non-trading derivative liabilities 4,000 9,000
Current Liabilities: Non-trading derivative liabilities | Indexed debt securities derivative | Derivatives not designated as hedging instruments:    
Derivative Assets Fair Value    
Derivative Assets Fair Value 0 0
Derivative Liability [Abstract]    
Derivative Liabilities Fair Value 538,000 605,000
Other Liabilities: Non-trading derivative liabilities | Natural gas derivatives | Derivatives not designated as hedging instruments:    
Derivative Assets Fair Value    
Gross Amounts Recognized 0 0
Derivative Liability [Abstract]    
Current Liabilities: Non-trading derivative liabilities $ 1,000 $ 3,000