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Derivative Financial Instruments (Details 2)
Dec. 31, 2018
USD ($)
$ / shares
Oil Swaps [Member] | First quarter [Member]  
Volume (Bbl) | $ $ 1,767
Price per Bbl | $ / shares $ 65.85
Oil Swaps [Member] | Second quarter [Member]  
Volume (Bbl) | $ $ 1,767
Price per Bbl | $ / shares $ 65.85
Oil Swaps [Member] | Third quarter [Member]  
Volume (Bbl) | $ $ 1,767
Price per Bbl | $ / shares $ 65.85
Oil Swaps [Member] | Fourth quarter [Member]  
Volume (Bbl) | $ $ 589
Price per Bbl | $ / shares $ 65.85
Natural Gas Swaps [Member] | First quarter [Member]  
Volume (Bbl) | $ $ 1,138
Price per Bbl | $ / shares $ 2.875
Natural Gas Swaps [Member] | Second quarter [Member]  
Volume (Bbl) | $ $ 1,138
Price per Bbl | $ / shares $ 2.875
Natural Gas Swaps [Member] | Third quarter [Member]  
Volume (Bbl) | $ $ 1,138
Price per Bbl | $ / shares $ 2.875
Natural Gas Swaps [Member] | Fourth quarter [Member]  
Volume (Bbl) | $
Price per Bbl | $ / shares