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Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Net sales $ 243,295 [1] $ 271,806 [1] $ 684,331 [1] $ 773,369 [1]  
Cost of goods sold 218,222 [1] 255,281 [1] 614,048 [1] 729,750 [1]  
Operating expenses 7,474 [1] 9,540 [1] 23,075 [1] 20,637 [1]  
Segment contribution margin 17,599 6,985 47,208 22,982  
General and administrative expenses 1,868 [1] 1,804 [1] 5,172 [1] 6,937 [1]  
Depreciation and amortization 2,844 [1] 2,616 [1] 9,074 [1],[2] 7,720 [1],[2]  
Loss on sale of assets 0 [1] 5 [1] 0 [2] 5 [1],[2]  
Operating income 12,887 [1] 2,560 [1] 32,962 [1] 8,320 [1]  
Total assets 287,378 284,826 287,378 284,826 283,316 [3]
Capital spending (excluding business combinations) (1) 1,582 5,388 7,881 [2] 16,700 [2]  
Pipelines and Transportation [Member]
          
Segment Reporting Information [Line Items]          
Net sales 15,743 7,960 43,008 21,440  
Cost of goods sold 0 0 0 0  
Operating expenses 5,660 7,241 18,193 16,149  
Segment contribution margin 10,083 719 24,815 5,291  
Total assets 164,963 145,380 164,963 145,380  
Capital spending (excluding business combinations) (1) 1,065 5,064 6,513 15,400  
Wholesale Marketing and Terminalling [Member]
          
Segment Reporting Information [Line Items]          
Net sales 227,552 263,846 641,323 751,929  
Cost of goods sold 218,222 255,281 614,048 729,750  
Operating expenses 1,814 2,299 4,882 4,488  
Segment contribution margin 7,516 6,266 22,393 17,691  
Total assets 122,415 139,446 122,415 139,446  
Capital spending (excluding business combinations) (1) $ 517 $ 324 $ 1,368 $ 1,300  
[1] Adjusted to include the historical results of the Tyler Terminal and Tank Assets. See Notes 1 and 2 for further discussion.
[2] Adjusted to include the historical cash flows of the Tyler Terminal and Tank Assets. See Notes 1 and 2 for further discussion.
[3] Includes the historical balances of the Tyler Terminal and Tank Assets. See Notes 1 and 2 for further discussion.