Quarterly report pursuant to Section 13 or 15(d)

Sale of Appalachian Gathering Assets (Details)

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Sale of Appalachian Gathering Assets (Details) (USD $)
3 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Mar. 31, 2012
Appalachian Gathering Assets
acre
mi
Mar. 31, 2012
Appalachian Gathering Assets
Sep. 30, 2013
Appalachian Gathering Assets
Mar. 26, 2012
Appalachian Gathering Assets
acre
Sep. 30, 2013
Appalachian Gathering Assets
Maximum
Sale of Assets            
Period of exclusive rights to gather the gas within AOD   20 years        
Sale consideration   $ 375,000,000        
Area of low pressure pipeline systems and gathering rights sold (in miles)   25        
Area of land held (in acres)         104,000  
Area of AOD (in acres)   250,000        
Period for which entity is committed to deliver minimum volumes into gathering systems, with certain carryback and carryforward adjustments for overages or deficiencies       7 years    
Additional sale proceeds on meeting certain volume threshold           40,000,000
Earn out period       3 years    
Gain recognized on the sale of assets $ (115,000)   $ 291,000,000