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DERIVATIVES (Gain (Loss) Recognized in Income) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net $ 0 $ 0 $ 0 $ 0
Designated as Hedging Instrument [Member] | Inventory Supply Arrangement Obligation [Member] | Cost of Sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives   1,409,000   (3,220,000)
Designated as Hedging Instrument [Member] | Inventory Intermediation Agreement Obligation [Member] | Cost of Sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives (3,145,000) 34,424,000 (29,317,000) (50,150,000)
Designated as Hedging Instrument [Member] | Crude Oil and Feedstock Inventory [Member] | Cost of Sales [Member] | Fair Value Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives   (1,409,000)   3,220,000
Designated as Hedging Instrument [Member] | Intermediates and Refined Products Inventory [Member] | Cost of Sales [Member] | Fair Value Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives 3,145,000 (34,424,000) 29,317,000 50,150,000
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Cost of Sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives $ (15,559,000) $ 31,017,000 $ (54,646,000) $ (14,080,000)