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Derivatives and Hedge Accounting Activities - Schedule of Volume of Derivative Activity (Details)
 9 Months Ended
Sep. 30, 2016
MMcf
 [1]
Fixed Price - Natural Gas - Current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity (bcf) 7,700
Fixed Price - Natural Gas - Non-current Derivative Contract  
Derivative [Line Items]  
Volume of derivative activity (bcf) 34,100
[1] Includes options.