Annual report pursuant to Section 13 and 15(d)

Acquisitions - Fair Value of Assets Acquired (Details)

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Acquisitions - Fair Value of Assets Acquired (Details) - American Energy - Utica, LLC - USD ($)
$ in Thousands
Jun. 29, 2015
Jun. 12, 2015
Business Acquisition [Line Items]    
Cash, net of purchase price adjustments $ 405,000 $ 405,029
Fair value of net identifiable assets acquired   405,029
Proved    
Business Acquisition [Line Items]    
Fair value of net identifiable assets acquired   70,804
Unevaluated    
Business Acquisition [Line Items]    
Fair value of net identifiable assets acquired   $ 334,225