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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)
6 Months Ended
Jun. 30, 2019
Derivative Financial Instruments  
Schedule of gain loss on derivatives

    Three months ended June 30,     Six months ended June 30,  
    2019     2018     2019     2018  
Gain on derivatives:                      
Oil derivatives   $ 492,548     $     $ 424,952     $  
Natural gas derivatives     8,180             7,417        
Total   $ 500,728     $     $ 432,369     $  

Schedule of net cash receipts from derivatives

    Three months ended June 30,     Six months ended June 30,  
    2019     2018     2019     2018  
Net cash received from payments on derivatives                      
Oil derivatives   $ 74,154     $     $ 93,503     $  
Natural gas derivatives     4,305             4,711        
Total   $ 78,459     $     $ 98,214     $  

Schedule of notional amounts of outstanding derivative

    1st Quarter     2nd Quarter     3rd Quarter     4th Quarter  
2019                        
Oil Swaps:                        
Volume (MBbl)                 28.05       24.58  
Price per Bbl               $ 62.09     $ 61.37  
                             
Natural Gas Swaps:                            
Volume (MMcf)                 1.14          
Price per Mcf                   $ 2.875          
                                 
                                 
2020                                
Oil Swaps:                                
Volume (MBbl)     23.41       23.17       22.94       13.77  
Price per Bbl   $ 60.32     $ 59.53     $ 58.26     $ 58.13