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Fair Value (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Liabilities:    
RINs obligation   $ 334
Forward Contracts | Commodity Contracts
   
Assets:    
Derivative Assets   22
Liabilities:    
Derivative Liabilities 717  
Forward Contracts | Fair Value Hedges
   
Liabilities:    
Derivative Liabilities 878 2,304
Level 1
   
Liabilities:    
RINs obligation   0
Level 1 | Forward Contracts | Commodity Contracts
   
Assets:    
Derivative Assets   22
Liabilities:    
Derivative Liabilities 717  
Level 1 | Forward Contracts | Fair Value Hedges
   
Liabilities:    
Derivative Liabilities 0 0
Level 2
   
Liabilities:    
RINs obligation   334
Level 2 | Forward Contracts | Commodity Contracts
   
Assets:    
Derivative Assets   0
Liabilities:    
Derivative Liabilities 0  
Level 2 | Forward Contracts | Fair Value Hedges
   
Liabilities:    
Derivative Liabilities 878 2,304
Level 3
   
Liabilities:    
RINs obligation   0
Level 3 | Forward Contracts | Commodity Contracts
   
Assets:    
Derivative Assets   0
Liabilities:    
Derivative Liabilities 0  
Level 3 | Forward Contracts | Fair Value Hedges
   
Liabilities:    
Derivative Liabilities $ 0 $ 0