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Fair Value - Schedule of Quantitative Information (Details) - Natural Gas Exchange Agreements [Member] $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) MMBTU $ / MMBTU | Dec. 31, 2019 USD ($)
Fair Value, Recurring [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | $ | $ (3,674) | $ (2,976)
Sales [Member] | Minimum [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative, Forward Price | 2.51 |
Transaction/Delivery Volumes | MMBTU | 140,000 |
Sales [Member] | Maximum [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative, Forward Price | 4.77 |
Transaction/Delivery Volumes | MMBTU | 310,000 |
Sales [Member] | Weighted Average [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative, Forward Price | 3.97 |

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