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DERIVATIVES - Commodity Contracts (Details)	Sep. 30, 2018 bbl / d $ / bbl bbl
Calls | Purchased | Q1 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	2,000
Weighted-average price (in dollars per barrel)	71.00
Calls | Sold | Q4 2018
Derivatives
Daily Volume (in Bbl) | bbl / d	15,000
Weighted-average price (in dollars per barrel)	58.83
Calls | Sold | Q1 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	15,000
Weighted-average price (in dollars per barrel)	66.15
Calls | Sold | Q2 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	5,000
Weighted-average price (in dollars per barrel)	68.45
Puts | Purchased | Q1 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	33,000
Weighted-average price (in dollars per barrel)	63.48
Puts | Purchased | Q2 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	35,000
Weighted-average price (in dollars per barrel)	68.29
Puts | Purchased | Q3 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	30,000
Weighted-average price (in dollars per barrel)	71.67
Puts | Purchased | Q4 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	20,000
Weighted-average price (in dollars per barrel)	75.00
Puts | Sold | Q4 2018
Derivatives
Daily Volume (in Bbl) | bbl / d	19,000
Weighted-average price (in dollars per barrel)	45.00
Puts | Sold | Q1 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	35,000
Weighted-average price (in dollars per barrel)	50.71
Puts | Sold | Q2 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	30,000
Weighted-average price (in dollars per barrel)	55.00
Puts | Sold | Q3 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	30,000
Weighted-average price (in dollars per barrel)	56.67
Puts | Sold | Q4 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	20,000
Weighted-average price (in dollars per barrel)	60.00
Swaps | Q4 2018
Derivatives
Daily Volume (in Bbl) | bbl / d	48,000
Weighted-average price (in dollars per barrel)	60.35
Swaps | Q1 2019
Derivatives
Daily Volume (in Bbl) | bbl / d	7,000
Weighted-average price (in dollars per barrel)	67.71
Maximum increase in volume per quarter of crude oil counter-party swaps (in barrels per day) | bbl	5,000
Weighted-average Brent price (in dollars per barrel)	70.00

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- Definition

Represents the maximum increase in counter-party option swaps per quarter.

+ References

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- Definition

The average strike price on the group of price risk option contracts such as put options or call options in the maximum increase in counter-party option swaps per quarter.

+ References

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X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The average strike price on the group of price risk option contracts such as put options or call options.

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