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Subsequent Event (Details) - Subsequent Event - Statoil
$ in Millions
Jul. 08, 2016
USD ($)
a
MMcfe
Subsequent Event [Line Items]  
Area of property acquired (in acres) 62,500
Total consideration | $ $ 407.0
Natural gas production amount per day (in MMcfe) | MMcfe 50
Drilling Rights  
Subsequent Event [Line Items]  
Area of property acquired (in acres) 53,000