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DERIVATIVES (Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
bbl
Mar. 31, 2016
USD ($)
Dec. 31, 2016
bbl
Derivative [Line Items]      
Loss on fair value hedge ineffectiveness | $ $ 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]      
Derivative [Line Items]      
Derivative, notional amount, volume 3,471,786   2,942,348
Crude Oil Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume 14,845,000   5,950,000
Refined Product Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume 6,714,000   2,831,000