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DERIVATIVES (Gain (Loss) Recognized in Income) (Details) - Cost of Sales [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Designated as Hedging Instrument [Member] | Inventory Supply Arrangement Obligation [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in Income on Derivatives   $ (2,821)
Designated as Hedging Instrument [Member] | Inventory Intermediation Agreement Obligation [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in Income on Derivatives $ (35,146) (63,686)
Designated as Hedging Instrument [Member] | Crude Oil and Feedstock Inventory [Member] | Fair Value Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in Income on Derivatives   2,821
Designated as Hedging Instrument [Member] | Intermediates and Refined Products Inventory [Member] | Fair Value Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in Income on Derivatives 35,146 63,686
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in Income on Derivatives $ (19,953) $ (41,128)