DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Gross Derivative Carrying Value
Derivatives, Fair Value
Net derivative assets (liabilities)	$ (31,302)	$ (139,075)
Net Total
Derivatives, Fair Value
Net derivative assets (liabilities)	(31,302)	(139,075)
Derivatives NOT Designated as Hedging Instruments
Derivatives, Fair Value
Net derivative assets (liabilities)	4,994	(5,778)
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value
Net derivative assets (liabilities)	(36,296)	(133,297)
Current derivative assets | Gross Derivative Carrying Value
Derivatives, Fair Value
Net derivative assets (liabilities)	66,274	13,007
Current derivative assets | Gross Derivative Carrying Value | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	4,396	1,489
Current derivative assets | Gross Derivative Carrying Value | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	594	724
Current derivative assets | Gross Derivative Carrying Value | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	61,284	10,794
Current derivative assets | Netting Balance Sheet Adjustment
Derivatives, Fair Value
Net derivative assets (liabilities)	(59,808)	(11,288)
Current derivative assets | Netting Balance Sheet Adjustment | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(1,330)	(335)
Current derivative assets | Netting Balance Sheet Adjustment | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(30)	(159)
Current derivative assets | Netting Balance Sheet Adjustment | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(58,448)	(10,794)
Current derivative assets | Net Total
Derivatives, Fair Value
Net derivative assets (liabilities)	6,466	1,719
Current derivative assets | Net Total | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	3,066	1,154
Current derivative assets | Net Total | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	564	565
Current derivative assets | Net Total | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	2,836
Current derivative assets | Derivatives NOT Designated as Hedging Instruments
Derivatives, Fair Value
Net derivative assets (liabilities)	65,888	12,572
Current derivative assets | Derivatives NOT Designated as Hedging Instruments | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	4,396	1,489
Current derivative assets | Derivatives NOT Designated as Hedging Instruments | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	594	724
Current derivative assets | Derivatives NOT Designated as Hedging Instruments | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	60,898	10,359
Current derivative assets | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value
Net derivative assets (liabilities)	386	435
Current derivative assets | Derivatives Designated as Hedging Instruments | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	386	435
Current derivative liabilities | Gross Derivative Carrying Value
Derivatives, Fair Value
Net derivative assets (liabilities)	(62,339)	(94,277)
Current derivative liabilities | Gross Derivative Carrying Value | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(3,687)	(2,377)
Current derivative liabilities | Gross Derivative Carrying Value | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(204)	(705)
Current derivative liabilities | Gross Derivative Carrying Value | Interest rate Swap
Derivatives, Fair Value
Net derivative assets (liabilities)		(72,831)
Current derivative liabilities | Gross Derivative Carrying Value | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(58,448)	(18,364)
Current derivative liabilities | Netting Balance Sheet Adjustment
Derivatives, Fair Value
Net derivative assets (liabilities)	59,808	11,288
Current derivative liabilities | Netting Balance Sheet Adjustment | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	1,330	335
Current derivative liabilities | Netting Balance Sheet Adjustment | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	30	159
Current derivative liabilities | Netting Balance Sheet Adjustment | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	58,448	10,794
Current derivative liabilities | Net Total
Derivatives, Fair Value
Net derivative assets (liabilities)	(2,531)	(82,989)
Current derivative liabilities | Net Total | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(2,357)	(2,042)
Current derivative liabilities | Net Total | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(174)	(546)
Current derivative liabilities | Net Total | Interest rate Swap
Derivatives, Fair Value
Net derivative assets (liabilities)		(72,831)
Current derivative liabilities | Net Total | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)		(7,570)
Current derivative liabilities | Derivatives NOT Designated as Hedging Instruments
Derivatives, Fair Value
Net derivative assets (liabilities)	(60,894)	(18,350)
Current derivative liabilities | Derivatives NOT Designated as Hedging Instruments | Physical Fixed Price Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(3,687)	(2,377)
Current derivative liabilities | Derivatives NOT Designated as Hedging Instruments | Physical Index Derivative Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(204)	(705)
Current derivative liabilities | Derivatives NOT Designated as Hedging Instruments | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(57,003)	(15,268)
Current derivative liabilities | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value
Net derivative assets (liabilities)	(1,445)	(75,927)
Current derivative liabilities | Derivatives Designated as Hedging Instruments | Interest rate Swap
Derivatives, Fair Value
Net derivative assets (liabilities)		(72,831)
Current derivative liabilities | Derivatives Designated as Hedging Instruments | Refined products | Futures Contracts
Derivatives, Fair Value
Net derivative assets (liabilities)	(1,445)	(3,096)
Non-current derivative liabilities | Gross Derivative Carrying Value
Derivatives, Fair Value
Net derivative assets (liabilities)	(35,237)	(57,805)
Non-current derivative liabilities | Gross Derivative Carrying Value | Interest rate Swap
Derivatives, Fair Value
Net derivative assets (liabilities)	(35,237)	(57,805)
Non-current derivative liabilities | Net Total
Derivatives, Fair Value
Net derivative assets (liabilities)	(35,237)	(57,805)
Non-current derivative liabilities | Net Total | Interest rate Swap
Derivatives, Fair Value
Net derivative assets (liabilities)	(35,237)	(57,805)
Non-current derivative liabilities | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value
Net derivative assets (liabilities)	(35,237)	(57,805)
Non-current derivative liabilities | Derivatives Designated as Hedging Instruments | Interest rate Swap
Derivatives, Fair Value
Net derivative assets (liabilities)	$ (35,237)	$ (57,805)