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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Net sales $ 210,894 $ 239,084  
Cost of Goods Sold 187,860 225,409  
Operating expenses 5,862 4,210  
Segment Contribution Margin 17,172 9,465  
General and Administrative Expense 1,677 2,407  
Depreciation and amortization 2,352 2,134  
Loss on sale of assets 0 5  
Operating income 13,143 4,919  
Total assets 260,806 229,880 245,769
Capital spending (excluding business combinations) 1,276 1,013  
Wholesale Marketing and Terminalling [Member]
      
Segment Reporting Information [Line Items]      
Net sales 197,357 232,404  
Cost of Goods Sold 187,860 225,409  
Operating expenses 1,241 932  
Segment Contribution Margin 8,256 6,063  
Total assets 97,759 119,248  
Capital spending (excluding business combinations) 148 637  
Pipelines and Transportation [Member]
      
Segment Reporting Information [Line Items]      
Net sales 13,537 6,680  
Cost of Goods Sold 0 0  
Operating expenses 4,621 3,278  
Segment Contribution Margin 8,916 3,402  
Total assets 163,047 110,632  
Capital spending (excluding business combinations) $ 1,128 $ 376