DERIVATIVES (Narrative) (Details)	12 Months Ended
Dec. 31, 2016 USD ($) bbl	Dec. 31, 2015 USD ($) bbl
Derivative [Line Items]
Gain (loss) on fair value hedge ineffectiveness \| $	$ 0	$ 0
Crude Oil and Feedstock Inventory [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, notional amount, volume	0	0
Crude Oil and Feedstock Inventory [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, notional amount, volume	0	0
Intermediates and Refined Products Inventory [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, notional amount, volume	0	0
Intermediates and Refined Products Inventory [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, notional amount, volume	2,942,348	3,776,011
Crude Oil Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, notional amount, volume	5,950,000	39,577,000
Refined Product Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, notional amount, volume	2,831,000	4,599,136

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

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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Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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