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FAIR VALUE MEASUREMENTS (Details) (Fair Value, Measurements, Recurring, USD $)
Jun. 30, 2013
Dec. 31, 2012
Level 1
   
Fair value measurements    
Fair value $ 2,836,000 $ (7,570,000)
Level 1 | Refined products | Futures Contracts
   
Fair value measurements    
Financial assets 2,836,000  
Financial liabilities   (7,570,000)
Level 2
   
Fair value measurements    
Fair value (34,138,000) (131,505,000)
Level 2 | Physical Fixed Price Derivative Contracts
   
Fair value measurements    
Financial assets 3,066,000 1,154,000
Financial liabilities (2,357,000) (2,042,000)
Level 2 fixed-price contracts assets, CVA (100,000) (100,000)
Level 2 | Physical Index Derivative Contracts
   
Fair value measurements    
Financial assets 564,000 565,000
Financial liabilities (174,000) (546,000)
Level 2 | Interest rate contracts
   
Fair value measurements    
Financial liabilities $ (35,237,000) $ (130,636,000)