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Significant Concentrations (Tables)
12 Months Ended
Dec. 31, 2017
Risks and Uncertainties [Abstract]  
Schedule of Company's Oil and Gas Sales

During the years ended December 31, 2017, 2016 and 2015, three joint interest operators accounted for the following percentages of the Company’s oil and gas sales:

 

Operator   2017     2016     2015  
                   
A     13 %     16 %     20 %
B     25 %     32 %     35 %
C     34 %     29 %     25 %