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Fair Value Measurements - Significant Unobservable Inputs - Derivative Contracts (Details) - Natural gas basis swaps - Fair Value Measurements Level 3 $ in Thousands | Sep. 30, 2016 USD ($) $ / Mcf | Dec. 31, 2015 USD ($) $ / Mcf
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Fair Value | $ | $ (170) | $ (1,748)
Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Natural gas basis differential forward curve (usd/mcf) | (0.13) | (0.06)
Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Natural gas basis differential forward curve (usd/mcf) | (0.25) | (0.28)
Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Natural gas basis differential forward curve (usd/mcf) | (0.20) | (0.22)

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