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DERIVATIVES (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
bbl
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
bbl
Jun. 30, 2016
USD ($)
Dec. 31, 2016
bbl
Derivative [Line Items]          
Loss on fair value hedge ineffectiveness | $ $ 0 $ 0 $ 0 $ 0  
Intermediates and Refined Products Inventory [Member] | Fair Value Hedging [Member]          
Derivative [Line Items]          
Derivative, notional amount, volume 3,005,137   3,005,137   2,942,348
Crude Oil Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Derivative, notional amount, volume 10,566,000   10,566,000   5,950,000
Refined Product Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Derivative, notional amount, volume 8,732,000   8,732,000   2,831,000