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Acquisitions - Allocation of Purchase Price (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
West Williston Acquisition [Member]
  
Business Combination, Consideration Transferred [Abstract]  
Cash $ 1,496,369
Total consideration 1,496,369
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]  
Proved developed properties 535,477
Proved undeveloped properties 165,907
Unproved lease acquisition costs 787,589
Other property and equipment 13,157
Inventory 3,181
Total assets acquired 1,505,311
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]  
Asset retirement obligations 6,598
Revenues payable 2,344
Total liabilities assumed 8,942
Total identifiable net assets 1,496,369
East Nesson [Member]
  
Business Combination, Consideration Transferred [Abstract]  
Cash 55,339
Forgiveness of debt 1,896
Total consideration 57,235
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]  
Proved developed properties 32,511
Proved undeveloped properties 1,807
Unproved lease acquisition costs 23,369
Inventory 148
Total assets acquired 57,835
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]  
Asset retirement obligations 307
Revenues payable 293
Total liabilities assumed 600
Total identifiable net assets $ 57,235