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v3.19.2

Fair Value (Quantitative Information) (Details) - Natural Gas Exchange Agreements [Member] $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) MMBTU $ / MmBtu | Dec. 31, 2018 USD ($)
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Derivative Liability | $ | $ (2,992) | $ (2,774)
Sales [Member] | Minimum [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Forward Price | $ / MmBtu | 1.45 |
Transaction/Delivery Volumes | MMBTU | 60,000 |
Sales [Member] | Maximum [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Forward Price | $ / MmBtu | 3.62 |
Transaction/Delivery Volumes | MMBTU | 310,000 |
Purchase [Member] | Minimum [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Forward Price | $ / MmBtu | 1.37 |
Transaction/Delivery Volumes | MMBTU | 118,162 |
Purchase [Member] | Maximum [Member] | Internally Derived Weighted Average Cost Of Gas [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Derivative, Forward Price | $ / MmBtu | 2.30 |
Transaction/Delivery Volumes | MMBTU | 310,000 |

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