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Acquisitions and Dispositions - Schedule of Fair Values of the Properties Acquired (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 10, 2017
Jan. 04, 2017
Jun. 17, 2016
Jun. 15, 2016
Jun. 30, 2017
Jun. 30, 2017
Weld County, Colorado            
Business Acquisition [Line Items]            
Proved oil and natural gas properties       $ 18,948    
Unproved oil and natural gas properties       14,082    
Net working capital       1,038    
Asset retirement obligations       (50)    
Total fair value       $ 34,018    
Freeport-McMoRan oil and Gas, Inc            
Business Acquisition [Line Items]            
Proved oil and natural gas properties     $ 20,787      
Unproved oil and natural gas properties     65,745      
Net working capital     1,026      
Total fair value     $ 87,558      
Twelve Texas countries, primarily Angelina and Nacagdoches [Member] | Series of Individually Immaterial Business Acquisitions            
Business Acquisition [Line Items]            
Proved oil and natural gas properties         $ 5,006  
Unproved oil and natural gas properties         45,477  
Total fair value         $ 50,483  
Loving County, Texas | Series of Individually Immaterial Business Acquisitions            
Business Acquisition [Line Items]            
Proved oil and natural gas properties   $ 3,331        
Unproved oil and natural gas properties   18,802        
Net working capital   204        
Total fair value   $ 22,337        
Loving and Winkler Counties, Texas | Series of Individually Immaterial Business Acquisitions            
Business Acquisition [Line Items]            
Proved oil and natural gas properties $ 1,804          
Unproved oil and natural gas properties 15,206          
Net working capital 59          
Total fair value $ 17,069         $ 3,400