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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2015
Apr. 30, 2015
Dec. 31, 2014
Oct. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Acquisitions and Disposals                
Acquisitions of oil and gas           $ 16,312 $ 214,737 $ 0
Gain (loss) on sale of assets           3,866 17,120 21,351
Proceeds from sale of assets           $ 7,653 $ 39,492 323,501
Oil and gas properties, proved and unproved                
Significant Acquisitions and Disposals                
Gain (loss) on sale of assets               19,500
Proceeds from sale of assets               $ 44,300
Oil and gas properties, proved and unproved | Eagle Ford Shale in South Texas                
Significant Acquisitions and Disposals                
Acquisition cost of proved and unproved oil and gas properties     $ 30,500 $ 210,000        
Acquisitions of oil and gas   $ 16,000 $ 29,900 185,200        
Adjustment to acquisition cost, consents for leaseholds       17,400        
Adjustment to acquisition cost, customary purchase price adjustment       7,400        
Acquisition, assumed liability related to asset retirement obligations       1,200        
Oil and gas properties, proved and unproved | East Texas                
Significant Acquisitions and Disposals                
Gain (loss) on sale of assets       19,900        
Proceeds from sale of assets       $ 44,300        
Oil and gas properties, proved and unproved | Oklahoma and Texas Panhandles Properties                
Significant Acquisitions and Disposals                
Gain (loss) on sale of assets         $ 19,400      
Proceeds from sale of assets         160,000      
Oil and gas properties, proved and unproved | Oklahoma Texas and Kansas Properties                
Significant Acquisitions and Disposals                
Gain (loss) on sale of assets         (17,500)      
Proceeds from sale of assets         $ 123,400      
Oil and gas properties | Significant Unobservable Inputs (Level 3)                
Significant Acquisitions and Disposals                
Capital rate 10.00%   10.00%