Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
5 Months Ended 9 Months Ended
Jul. 31, 2011
Sep. 30, 2012
acre
Wexford Capital Lp [Member]
   
Business Acquisition [Line Items]    
Affiliates Participation Percentage in Acquisition of Leases   50.00%
Utica Shale [Member]
   
Business Acquisition [Line Items]    
Gas and oil acreage, undeveloped, gross   128,000
Gas and oil acreage, undeveloped, net   64,000
Cash price of ownership interest   $ 205.8
Equity offered for the payment of acquisition, shares 6.2