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Fair Value Measurements - Significant Unobservable Inputs - Derivative Contracts (Details) - Natural gas basis swaps - Fair Value Measurements Level 3
$ in Thousands
Jun. 30, 2016
USD ($)
$ / Mcf
Dec. 31, 2015
USD ($)
$ / Mcf
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Fair Value | $ $ (356) $ (1,748)
Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Derivative, forward price (usd/mcf) (0.09) (0.06)
Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Derivative, forward price (usd/mcf) (0.26) (0.28)
Weighted Average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Derivative, forward price (usd/mcf) (0.19) (0.22)