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Acquisitions and Divestitures - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Oct. 01, 2013
Sep. 26, 2013
West Williston    
Business Combination, Consideration Transferred [Abstract]    
Cash $ 1,475,361  
Forgiveness of debt 0  
Total consideration 1,475,361  
Assets acquired:    
Proved developed properties 519,712  
Proved undeveloped properties 165,907  
Unproved lease acquisition costs 787,589  
Other property and equipment 13,157  
Inventory 3,181  
Accounts receivable 276  
Total assets acquired 1,489,822  
Liabilities assumed:    
Asset retirement obligations 6,598  
Revenues payable 7,863  
Total liabilities assumed 14,461  
Total identifiable net assets $ 1,475,361  
East Nesson    
Business Combination, Consideration Transferred [Abstract]    
Cash   $ 56,793
Forgiveness of debt   (43)
Total consideration   56,750
Assets acquired:    
Proved developed properties   32,053
Proved undeveloped properties   1,807
Unproved lease acquisition costs   23,369
Other property and equipment   0
Inventory   148
Accounts receivable   0
Total assets acquired   57,377
Liabilities assumed:    
Asset retirement obligations   307
Revenues payable   320
Total liabilities assumed   627
Total identifiable net assets   $ 56,750