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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Net sales $ 230,141 $ 262,480 $ 441,036 $ 501,563  
Cost of Goods Sold 207,966 249,060 395,826 474,469  
Operating expenses 6,067 4,884 11,929 9,094  
Segment Contribution Margin 16,108 8,536 33,281 18,000  
General and Administrative Expense 1,111 2,346 2,788 4,753  
Depreciation and amortization 2,372 2,260 4,724 4,394  
Gain on sale of assets 0 (5) 0 0  
Operating income 12,625 3,935 25,769 8,853  
Total assets 258,822 236,806 258,822 236,806 245,769
Capital spending (excluding business combinations) 1,053 1,190 2,329 2,203  
Wholesale Marketing and Terminalling [Member]
          
Segment Reporting Information [Line Items]          
Net sales 216,475 255,679 413,771 488,083  
Cost of Goods Sold 207,966 249,060 395,826 474,469  
Operating expenses 1,340 1,069 2,581 2,001  
Segment Contribution Margin 7,169 5,550 15,364 11,613  
Total assets 101,980 125,592 101,980 125,592  
Capital spending (excluding business combinations) 688 475 836 1,112  
Pipelines and Transportation [Member]
          
Segment Reporting Information [Line Items]          
Net sales 13,666 6,801 27,265 13,480  
Cost of Goods Sold 0 0 0 0  
Operating expenses 4,727 3,815 9,348 7,093  
Segment Contribution Margin 8,939 2,986 17,917 6,387  
Total assets 156,842 111,214 156,842 111,214  
Capital spending (excluding business combinations) $ 365 $ 715 $ 1,493 $ 1,091