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Fair Value (Quantitative Information) (Details) $ in Thousands | Dec. 31, 2019 USD ($) MMBTU $ / MmBtu | Dec. 31, 2018 USD ($)
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | $ | $ (82,203) | $ (102,453)
Fair Value, Recurring [Member] | Natural Gas Exchange Agreements [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | $ | $ (2,976) |
Measurement Input, Transaction Volumes [Member] [Member] | Sales [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | MMBTU | 60,000 |
Measurement Input, Transaction Volumes [Member] [Member] | Sales [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | MMBTU | 130,000 |
Measurement Input, Transaction Volumes [Member] [Member] | Purchase [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | MMBTU | 50,000 |
Measurement Input, Transaction Volumes [Member] [Member] | Purchase [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | MMBTU | 310,000 |
Measurement Input, Commodity Forward Price [Member] | Sales [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | $ / MmBtu | 1.60 |
Measurement Input, Commodity Forward Price [Member] | Sales [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | $ / MmBtu | 3.80 |
Measurement Input, Commodity Forward Price [Member] | Purchase [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | $ / MmBtu | 1.49 |
Measurement Input, Commodity Forward Price [Member] | Purchase [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability Measurement Input | $ / MmBtu | 2.38 |

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