Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

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Acquisitions (Details) (USD $)
3 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Feb. 15, 2013
Utica Shale [Member]
well
acre
Mar. 31, 2014
Utica Shale [Member]
acre
Mar. 31, 2014
Utica Shale [Member]
Proved Properties [Member]
Mar. 31, 2014
Utica Shale [Member]
Unproved Properties [Member]
Mar. 31, 2014
Utica Shale [Member]
Unevaluated Properties [Member]
Business Acquisition [Line Items]              
Gas and oil acreage, undeveloped, net     22,000 8,000      
Cash price of ownership interest     $ 220,000,000 $ 184,000,000      
Amount put in escrow     33,600,000        
Proceeds from issuance of common stock, net of offering costs and exercise of stock options 615,000 357,640,000 325,800,000        
Existing wells excluded     14        
Future wells excluded     16        
Purchase price       179,000,000      
Cash, net of purchase price adjustments       177,444,000      
Period to close sale             90 days
Fair value of oil and natural gas properties       $ 177,444,000 $ 32,005,000 $ 6,263,000 $ 139,176,000