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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Derivative Financial Instruments  
Schedule of gain loss on derivatives
    As of December 31,   
    2018     2017  
Gain (loss) on derivatives:                
Oil derivatives     125,902        
Natural gas derivatives     (8,105 )      
Total     117,797        
Schedule of net cash receipts from derivatives
    As of December 31,  
    2018     2017  
Net cash receipts from (payments on) derivatives:                
Oil derivatives     16,629        
Natural gas derivatives     (11,913 )      
Total     4,716        
Schedule of notional amounts of outstanding derivative
    First quarter     Second quarter     Third quarter     Fourth quarter  
Oil Swaps:                        
Volume (Bbl)     1,767       1,767       1,767       589  
Price per Bbl   $ 65.85     $ 65.85     $ 65.85     $ 65.85  
                                 
Natural Gas Swaps:                                
Volume (Bbl)     1,138       1,138       1,138        
Price per Bbl   $ 2.875     $ 2.875     $ 2.875        
Total