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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Derivative assets | $ 25,363 |
Derivative liabilities | 57 | $ 29,714
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments | 6,256 | 7,541
Netting adjustments, assets | (57) | 0
Assets at fair value | 31,562 | 7,541
Netting adjustments, liabilities | (57) | 0
Liabilities at fair value | 0 | 29,714
Fair Value, Measurements, Recurring | Commodity derivative contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Netting adjustments, assets | (57) |
Assets at fair value | 25,306 |
Netting adjustments, liabilities | (57) | 0
Liabilities at fair value | 0 | 29,714
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments | 6,256 | 7,541
Derivative assets | 6,256 | 7,541
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 |
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments | 0 | 0
Derivative assets | 25,363 | 0
Derivative liabilities | 57 | 29,714
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 | Commodity derivative contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Derivative assets | 25,363 |
Derivative liabilities | 57 | 29,714
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Investments | 0 | 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 |
Derivative liabilities | $ 0 | $ 0

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