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Acquisitions and Divestitures (Narrative) (Details)
$ in Thousands, MBoe in Millions
9 Months Ended
Apr. 03, 2017
USD ($)
a
MBoe
wells
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Acquisitions and Divestitures      
Other acquisitions   $ 2,100  
Proceeds from non-core oil and natural gas asset sales, net of related expenses   $ 18,000 $ 43,600
EOG Acquisition [Member]      
Acquisitions and Divestitures      
Total consideration given $ 54,332    
Business Acquisition, Effective Date of Acquisition Jan. 01, 2017    
Proved Developed Reserves (Volume) | MBoe 3.2    
Natural Gas Gathering System 1    
EOG Acquisition [Member] | Hoxbar [Member]      
Acquisitions and Divestitures      
Area of Real Estate Property | a 8,300    
Proved developed producing wells | wells 47    
Acquired land with existing production capacity, percent 71.00%