Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Weighted Average Price of Open Commodity Swap Derivative Instruments (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Weighted Average Price of Open Commodity Swap Derivative Instruments (Details)
9 Months Ended
Sep. 30, 2019
$ / bbl
bbl
2019  
Derivative [Line Items]  
Volume (in barrels) 2,460,411
Weighted average price (in dollars per barrel) | $ / bbl 58.96
2020  
Derivative [Line Items]  
Volume (in barrels) 9,427,594
Weighted average price (in dollars per barrel) | $ / bbl 58.53
2021  
Derivative [Line Items]  
Volume (in barrels) 5,740,924
Weighted average price (in dollars per barrel) | $ / bbl 55.76
2022  
Derivative [Line Items]  
Volume (in barrels) 1,372,866
Weighted average price (in dollars per barrel) | $ / bbl 52.57
Notional amount covered by options (in shares) 2,000,000.0
Increase in notional volume if options are exercised (in barrels) 2,000,000.0
Weighted average price if options are exercised (in dollars per barrel) | $ / bbl 54.84