Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Additional Information (Details)

v3.19.2
DERIVATIVE FINANCIAL INSTRUMENTS - Additional Information (Details)
Jun. 30, 2019
bbl
Dec. 31, 2018
$ / bbl
Oct. 27, 2017
bbl
Sep. 25, 2017
bbl
Number Of Barrels Per Day | bbl       1,000
Call Option        
Derivative, Price Risk Option Strike Price | $ / bbl   54.60    
Put Option        
Derivative, Price Risk Option Strike Price | $ / bbl   49.00    
April 2019 through December 2019        
Number Of Barrels Per Day | bbl 5,500      
January 2020 through December 2020        
Number Of Barrels Per Day | bbl 2,000      
Additional Derivative Contracts        
Number Of Barrels Per Day | bbl     1,000  
Additional Derivative Contracts | Call Option        
Derivative, Price Risk Option Strike Price | $ / bbl   54.80    
Additional Derivative Contracts | Put Option        
Derivative, Price Risk Option Strike Price | $ / bbl   51.00