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Divestitures, Assets Held for Sale, and Acquisitions Acquisitions (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
a
Jun. 30, 2018
USD ($)
a
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
a
Business Acquisition [Line Items]        
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)     $ 95,121  
Payments to Acquire Oil and Gas Property and Equipment     $ 24,571 $ 87,389
Howard and Martin Counties Trades 2018 [Member]        
Business Acquisition [Line Items]        
Non-monetary Trade, Acreage Acquired | a 2,658      
Non-monetary Trade, Acreage Exchanged | a 2,654      
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) $ 95,100      
Gain or loss recognized on trade $ 0      
Howard and Martin Counties Trades 2017 [Member]        
Business Acquisition [Line Items]        
Non-monetary Trade, Acreage Acquired | a       7,425
Non-monetary Trade, Acreage Exchanged | a       6,725
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)       $ 283,700
Gain or loss recognized on trade       $ 0
Other Martin County Acquisition 2018 [Member]        
Business Acquisition [Line Items]        
Net Acres Acquired | a   720    
Payments to Acquire Oil and Gas Property and Equipment   $ 24,600    
Other Howard and Martin Counties Acquisitions 2017 [Member]        
Business Acquisition [Line Items]        
Net Acres Acquired | a       3,400
Payments to Acquire Oil and Gas Property and Equipment       $ 72,200