FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified														3 Months Ended
	Jun. 30, 2013 Catalyst lease obligations [Member] Level 1 [Member]	Dec. 31, 2012 Catalyst lease obligations [Member] Level 1 [Member]	Jun. 30, 2013 Catalyst lease obligations [Member] Level 2 [Member]	Dec. 31, 2012 Catalyst lease obligations [Member] Level 2 [Member]	Jun. 30, 2013 Catalyst lease obligations [Member] Level 3 [Member]	Dec. 31, 2012 Catalyst lease obligations [Member] Level 3 [Member]	Jun. 30, 2013 Catalyst lease obligations [Member] Total [Member]	Dec. 31, 2012 Catalyst lease obligations [Member] Total [Member]	Jun. 30, 2013 Derivatives included with inventory supply arrangement obligations [Member] Level 1 [Member]	Jun. 30, 2013 Derivatives included with inventory supply arrangement obligations [Member] Level 3 [Member]	Dec. 31, 2012 Contingent consideration for refinery acquisition [Member] Level 1 [Member]	Dec. 31, 2012 Contingent consideration for refinery acquisition [Member] Level 2 [Member]	Dec. 31, 2012 Contingent consideration for refinery acquisition [Member] Level 3 [Member]	Jun. 30, 2013 Contingent consideration for refinery acquisition [Member] Level 3 [Member] Discounted Cash Flow [Member]	Dec. 31, 2012 Contingent consideration for refinery acquisition [Member] Total [Member]	Jun. 30, 2013 Commodity contract [Member] Level 1 [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 Commodity contract [Member] Total [Member]	Dec. 31, 2012 Inventory Supply and Offtake Arrangements [Member] Total [Member]	Jun. 30, 2013 Money market funds [Member] Level 1 [Member]	Dec. 31, 2012 Money market funds [Member] Level 1 [Member]	Jun. 30, 2013 Money market funds [Member] Level 2 [Member]	Dec. 31, 2012 Money market funds [Member] Level 2 [Member]	Jun. 30, 2013 Money market funds [Member] Level 3 [Member]	Dec. 31, 2012 Money market funds [Member] Level 3 [Member]	Jun. 30, 2013 Money market funds [Member] Total [Member]	Dec. 31, 2012 Money market funds [Member] Total [Member]	Dec. 31, 2012 Commodity contract [Member] Level 1 [Member]	Jun. 30, 2013 Commodity contract [Member] Level 2 [Member]	Dec. 31, 2012 Commodity contract [Member] Level 2 [Member]	Jun. 30, 2013 Commodity contract [Member] Level 3 [Member]	Dec. 31, 2012 Commodity contract [Member] Level 3 [Member]	Jun. 30, 2013 Commodity contract [Member] Total [Member]	Dec. 31, 2012 Commodity contract [Member] Total [Member]	Dec. 31, 2012 Derivatives included with inventory supply arrangement obligations [Member] Level 1 [Member]	Jun. 30, 2013 Derivatives included with inventory supply arrangement obligations [Member] Level 2 [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]	Jun. 30, 2013 Derivatives included with inventory supply arrangement obligations [Member] Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets									$ 0	$ 0												$ 5,855	$ 175,786	$ 0	$ 0	$ 0	$ 0	$ 5,855	$ 175,786	$ 3,303		$ 0		$ 0		$ 3,303	$ 0	$ 2,724	$ 5,595	$ 0	$ 2,724
Liabilities	$ 0	$ 0	$ 37,961	$ 43,442	$ 0	$ 0	$ 37,961	$ 43,442			$ 0	$ 0	$ 21,358		$ 21,358	$ 6,191	$ 0	$ 1,872	$ 0	$ 1,872	$ 5,595										$ 125		$ 0		$ 6,316
Valuation method used to measure financial instruments [Abstract]
Risk free interest rate														0.16%
Credit rate spread														4.38%
Discount rate														4.54%