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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

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