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DERIVATIVES - BSP JV (Details) - Purchased
Sep. 30, 2018
bbl / d
$ / bbl
Puts | 2018 through 2021  
Derivatives  
Weighted-average price (in dollars per barrel) | $ / bbl 50.00
BSP JV | Calls | 2018 through 2020  
Derivatives  
Daily Volume (in Bbl) | bbl / d 1,000
Weighted-average price (in dollars per barrel) | $ / bbl 60.00
BSP JV | Puts | 2018 through 2021  
Derivatives  
Daily Volume (in Bbl) | bbl / d 2,000