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FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Level 1 [Member]
Dec. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Level 2 [Member]
Dec. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Level 3 [Member]
Dec. 31, 2013
Derivatives included with inventory supply arrangement obligations [Member]
Total [Member]
Dec. 31, 2013
Commodity contract [Member]
Level 1 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 1 [Member]
Dec. 31, 2013
Commodity contract [Member]
Level 2 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 2 [Member]
Dec. 31, 2013
Commodity contract [Member]
Level 3 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 3 [Member]
Dec. 31, 2013
Commodity contract [Member]
Total [Member]
Dec. 31, 2012
Commodity contract [Member]
Total [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]
Dec. 31, 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]
Dec. 31, 2013
Catalyst lease obligations [Member]
Level 1 [Member]
Dec. 31, 2012
Catalyst lease obligations [Member]
Level 1 [Member]
Dec. 31, 2013
Catalyst lease obligations [Member]
Level 2 [Member]
Dec. 31, 2012
Catalyst lease obligations [Member]
Level 2 [Member]
Dec. 31, 2013
Catalyst lease obligations [Member]
Level 3 [Member]
Dec. 31, 2012
Catalyst lease obligations [Member]
Level 3 [Member]
Dec. 31, 2013
Catalyst lease obligations [Member]
Total [Member]
Dec. 31, 2012
Catalyst lease obligations [Member]
Total [Member]
Dec. 31, 2013
Money market funds [Member]
Level 1 [Member]
Dec. 31, 2012
Money market funds [Member]
Level 1 [Member]
Dec. 31, 2013
Money market funds [Member]
Level 2 [Member]
Dec. 31, 2012
Money market funds [Member]
Level 2 [Member]
Dec. 31, 2013
Money market funds [Member]
Level 3 [Member]
Dec. 31, 2012
Money market funds [Member]
Level 3 [Member]
Dec. 31, 2013
Money market funds [Member]
Total [Member]
Dec. 31, 2012
Money market funds [Member]
Total [Member]
Dec. 31, 2013
Non-Qualified Pension Plan Assets [Member]
Level 1 [Member]
Dec. 31, 2013
Non-Qualified Pension Plan Assets [Member]
Level 2 [Member]
Dec. 31, 2013
Non-Qualified Pension Plan Assets [Member]
Level 3 [Member]
Dec. 31, 2013
Non-Qualified Pension Plan Assets [Member]
Total [Member]
Dec. 31, 2013
Commodity contract [Member]
Level 1 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 1 [Member]
Dec. 31, 2013
Commodity contract [Member]
Level 2 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 2 [Member]
Dec. 31, 2013
Commodity contract [Member]
Level 3 [Member]
Dec. 31, 2012
Commodity contract [Member]
Level 3 [Member]
Dec. 31, 2013
Commodity contract [Member]
Total [Member]
Dec. 31, 2012
Commodity contract [Member]
Total [Member]
Dec. 31, 2013
Inventory Intermediation Agreement Obligation [Member]
Level 1 [Member]
Dec. 31, 2013
Inventory Intermediation Agreement Obligation [Member]
Level 2 [Member]
Dec. 31, 2013
Inventory Intermediation Agreement Obligation [Member]
Level 3 [Member]
Dec. 31, 2013
Inventory Intermediation Agreement Obligation [Member]
Total [Member]
Dec. 31, 2012
Inventory Supply Arrangement Obligation [Member]
Level 1 [Member]
Dec. 31, 2012
Inventory Supply Arrangement Obligation [Member]
Level 2 [Member]
Dec. 31, 2012
Inventory Supply Arrangement Obligation [Member]
Level 3 [Member]
Dec. 31, 2012
Inventory Supply Arrangement Obligation [Member]
Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                          
Assets                                                   $ 5,857 $ 175,786 $ 0 $ 0 $ 0 $ 0 $ 5,857 $ 175,786 $ 4,905 $ 0 $ 0 $ 4,905 $ 4,252 $ 3,303 $ 6,681 $ 0 $ 0 $ 0 $ 10,933 $ 3,303 $ 0 $ 6,016 $ 0 $ 6,016 $ 0 $ 5,595 $ 0 $ 5,595
Liabilities $ 0 $ 177 $ 0 $ 177 $ 0 $ 0 $ 6,989 $ 1,872 $ 23,365 $ 0 $ 30,354 $ 1,872 $ 0 $ 0 $ 21,358   $ 21,358 $ 0 $ 0 $ 53,089 $ 43,442 $ 0 $ 0 $ 53,089 $ 43,442                                                        
Valuation method used to measure financial instruments [Abstract]                                                                                                          
Risk free interest rate                               0.16%                                                                          
Credit rate spread                               4.38%                                                                          
Discount rate                               4.54%