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Fair Value Measurements - Significant Unobservable Inputs - Derivative Contracts (Details) - Natural gas basis swaps - Fair Value Measurements Level 3 $ in Thousands | Dec. 31, 2015 USD ($) $ / Mcf | Dec. 31, 2014 USD ($) $ / Mcf
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value | $ | $ (1,748) | $ 350
Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, forward price (usd/mcf) | (0.06) | (0.03)
Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, forward price (usd/mcf) | (0.28) | (0.38)
Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, forward price (usd/mcf) | (0.22) | (0.29)

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