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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Derivative assets | $ 224 | $ 5,582
Derivative liabilities | 43,847 | 18,467
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments |  | 5,072
Netting adjustments, assets | (151) | (4,272)
Assets at fair value | 73 | 6,382
Netting adjustments, liabilities | (151) | (4,272)
Liabilities at fair value | 43,696 | 14,195
Fair Value, Measurements, Recurring | Commodity derivative contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Netting adjustments, assets | (151) | (4,272)
Assets at fair value | 73 | 1,310
Netting adjustments, liabilities | (151) | (4,272)
Liabilities at fair value | 43,696 | 14,195
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments |  | 5,072
Derivative assets | 0 | 5,072
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 | Commodity derivative contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments |  | 0
Derivative assets | 224 | 5,582
Derivative liabilities | 43,847 | 18,467
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 | Commodity derivative contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Derivative assets | 224 | 5,582
Derivative liabilities | 43,847 | 18,467
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments |  | 0
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 | Commodity derivative contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Derivative assets | 0 | 0
Derivative liabilities | $ 0 | $ 0

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