DERIVATIVES (Gain (Loss) Recognized in Income) (Details) (Cost of Sales [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Designated as Hedging Instrument [Member] | Inventory Supply Arrangement Obligation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivatives	$ 4,880	$ (16,336)	$ (2,871)	$ (327)
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	6,393	12,412	3,505	(394)
Not Designated as Hedging Instrument [Member] | Inventory Supply Arrangement Obligation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivatives	0	0	0	(8)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivatives	$ (4,728)	$ 689	$ 13,949	$ 27,607