Annual report pursuant to Section 13 and 15(d)

Acquisitions - Fair Value of Assets Acquired (Details)

v3.3.1.900
Acquisitions - Fair Value of Assets Acquired (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 29, 2015
Jun. 12, 2015
Mar. 20, 2014
Dec. 31, 2015
American Energy - Utica, LLC        
Business Acquisition [Line Items]        
Cash, net of purchase price adjustments $ 405,000 $ 405,029    
Fair value of net identifiable assets acquired   405,029    
Utica Shale        
Business Acquisition [Line Items]        
Cash, net of purchase price adjustments     $ 179,527 $ 179,500
Fair value of net identifiable assets acquired     179,527  
Proved | American Energy - Utica, LLC        
Business Acquisition [Line Items]        
Fair value of net identifiable assets acquired   70,804    
Proved | Utica Shale        
Business Acquisition [Line Items]        
Fair value of net identifiable assets acquired     31,961  
Unproved | Utica Shale        
Business Acquisition [Line Items]        
Fair value of net identifiable assets acquired     6,263  
Unevaluated | American Energy - Utica, LLC        
Business Acquisition [Line Items]        
Fair value of net identifiable assets acquired   $ 334,225    
Unevaluated | Utica Shale        
Business Acquisition [Line Items]        
Fair value of net identifiable assets acquired     $ 141,303