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FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Catalyst lease obligations [Member]
Mar. 31, 2013
Catalyst lease obligations [Member]
Level 1 [Member]
Dec. 31, 2012
Catalyst lease obligations [Member]
Level 1 [Member]
Mar. 31, 2013
Catalyst lease obligations [Member]
Level 2 [Member]
Dec. 31, 2012
Catalyst lease obligations [Member]
Level 2 [Member]
Mar. 31, 2013
Catalyst lease obligations [Member]
Level 3 [Member]
Dec. 31, 2012
Catalyst lease obligations [Member]
Level 3 [Member]
Mar. 31, 2013
Catalyst lease obligations [Member]
Total [Member]
Mar. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Level 1 [Member]
Mar. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Level 2 [Member]
Mar. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Level 3 [Member]
Mar. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Total [Member]
Dec. 31, 2012
Contingent consideration for refinery acquisition [Member]
Mar. 31, 2013
Contingent consideration for refinery acquisition [Member]
Level 1 [Member]
Dec. 31, 2012
Contingent consideration for refinery acquisition [Member]
Level 1 [Member]
Mar. 31, 2013
Contingent consideration for refinery acquisition [Member]
Level 2 [Member]
Dec. 31, 2012
Contingent consideration for refinery acquisition [Member]
Level 2 [Member]
Mar. 31, 2013
Contingent consideration for refinery acquisition [Member]
Level 3 [Member]
Dec. 31, 2012
Contingent consideration for refinery acquisition [Member]
Level 3 [Member]
Mar. 31, 2013
Contingent consideration for refinery acquisition [Member]
Level 3 [Member]
Discounted Cash Flow [Member]
Mar. 31, 2013
Contingent consideration for refinery acquisition [Member]
Total [Member]
Dec. 31, 2012
Commodity contract [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 1 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 2 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 3 [Member]
Dec. 31, 2012
Money market funds [Member]
Mar. 31, 2013
Money market funds [Member]
Level 1 [Member]
Dec. 31, 2012
Money market funds [Member]
Level 1 [Member]
Mar. 31, 2013
Money market funds [Member]
Level 2 [Member]
Dec. 31, 2012
Money market funds [Member]
Level 2 [Member]
Mar. 31, 2013
Money market funds [Member]
Level 3 [Member]
Dec. 31, 2012
Money market funds [Member]
Level 3 [Member]
Mar. 31, 2013
Money market funds [Member]
Total [Member]
Dec. 31, 2012
Commodity contract [Member]
Mar. 31, 2013
Commodity contract [Member]
Level 1 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 1 [Member]
Mar. 31, 2013
Commodity contract [Member]
Level 2 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 2 [Member]
Mar. 31, 2013
Commodity contract [Member]
Level 3 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 3 [Member]
Mar. 31, 2013
Commodity contract [Member]
Total [Member]
Dec. 31, 2012
Derivatives included with inventory supply arrangement obligations [Member]
Dec. 31, 2012
Derivatives included with inventory supply arrangement obligations [Member]
Level 1 [Member]
Dec. 31, 2012
Derivatives included with inventory supply arrangement obligations [Member]
Level 2 [Member]
Dec. 31, 2012
Derivatives included with inventory supply arrangement obligations [Member]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                          
Assets                                                   $ 175,786 $ 220,830 $ 175,786 $ 0 $ 0 $ 0 $ 0 $ 220,830 $ 3,303 $ 1,255 $ 3,303 $ 9,715 $ 0 $ 0 $ 0 $ 10,970 $ 5,595 $ 0 $ 5,595 $ 0
Liabilities $ 43,442 $ 0 $ 0 $ 44,780 $ 43,442 $ 0 $ 0 $ 44,780 $ 0 $ 2,156 $ 0 $ 2,156 $ 21,358 $ 0 $ 0 $ 0 $ 0 $ 21,358 $ 21,358   $ 21,358 $ 1,872 $ 0 $ 1,872 $ 0                                        
Valuation method used to measure financial instruments [Abstract]                                                                                          
Risk free interest rate                                       0.16%                                                  
Credit rate spread                                       4.38%                                                  
Discount rate                                       4.54%