COMMODITY DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details) bbl in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) $ / bbl bbl	Mar. 31, 2018 USD ($) $ / bbl bbl
Swap
Derivative [Line Items]
Weighted Average Strike Price (in usd per barrel) \| $ / bbl	62.67	55.37
Remaining Volume (Barrels) \| bbl	80	80
Fair Value (Asset)	$ 918,200
Fair Value (Liability)		$ (23,200)
Swap
Derivative [Line Items]
Weighted Average Strike Price (in usd per barrel) \| $ / bbl	81.14	81.59
Remaining Volume (Barrels) \| bbl	80	80
Fair Value (Liability)	$ (519,120)	$ (35,448)
Futures
Derivative [Line Items]
Weighted Average Strike Price (in usd per barrel) \| $ / bbl	82.87	81.10
Remaining Volume (Barrels) \| bbl	65	110
Fair Value (Asset)	$ 50,723
Fair Value (Liability)		$ (408,180)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

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- Definition

The strike price on the price risk option contract such as a put option or a call option.

+ References

No definition available.

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