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Guarantees (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Letters of credit [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Truck-tractors and Tank Trailers [Member]
Aggregate guaranteed residual values [Abstract]            
2013 $ 216         $ 216
2014 0         0
2015 0         0
Thereafter 0         0
Equipment residual values, Total 216         216
Term of supply contracts       3 years 10 years  
Potential obligation 1,385          
Parental guaranteed obligations [Abstract]            
Lease payments, 2013 3,404         47
Lease payments, 2014 1,718         0
Lease payments, 2015 1,450         0
Lease payments, 2016 1,431         0
Lease payments, Thereafter 724         0
Lease payments, total           47
Equipment residual values, 2013 216         216
Equipment residual values, 2014 0         0
Equipment residual values, 2015 0         0
Equipment residual values, 2016 0          
Equipment residual values, Thereafter 0         0
Equipment residual values, Total 216         216
Commodity purchases, 2013 61,942          
Commodity purchases, 2014 0          
Commodity purchases, 2015 0          
Commodity purchases, 2016 0          
Commodity purchases, Thereafter 0          
Commodity purchases, Total 61,942          
Letters of credit, 2013     21,996      
Letters of credit, 2014     0      
Letters of credit, 2015     0      
Letters of credit, 2016     0      
Letters of credit, Thereafter     0      
Letters of credit, Total 0 0 21,996      
Guaranteed obligations, 2013 84,201          
Guaranteed obligations, 2014 0          
Guaranteed obligations, 2015 0          
Guaranteed obligations, 2016 0          
Guaranteed obligations Thereafter 0          
Guaranteed obligations, Total $ 84,201