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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Net Sales:          
Affiliate $ 40,131 $ 36,360 $ 116,574 $ 111,814  
Third party 90,495 71,110 270,294 211,565  
Net sales 130,626 107,470 386,868 323,379  
Operating costs and expenses:          
Cost of goods sold 89,120 73,527 266,749 213,381  
Operating expenses 10,662 9,251 30,986 28,445  
Segment contribution margin 30,844 24,692 89,133 81,553  
General and administrative expenses 2,751 2,307 8,255 7,918  
Depreciation and amortization 5,462 5,356 16,397 15,164  
(Gain) loss on asset disposals (5) 28 2 (16)  
Operating income 22,636 17,001 64,479 58,487  
Capital spending (excluding business combinations) 3,786 3,077 8,696 5,009  
Total assets 422,858   422,858   $ 415,547
Pipelines and Transportation [Member]          
Net Sales:          
Affiliate 27,805 25,238 81,972 77,680  
Third party 3,177 3,388 7,910 15,739  
Net sales 30,982 28,626 89,882 93,419  
Operating costs and expenses:          
Cost of goods sold 4,883 4,811 13,691 14,401  
Operating expenses 8,573 7,678 24,661 22,317  
Segment contribution margin 17,526 16,137 51,530 56,701  
Capital spending (excluding business combinations) 2,918 2,613 6,715 4,037  
Total assets 344,260   344,260   337,349
Wholesale Marketing and Terminalling [Member]          
Net Sales:          
Affiliate 12,326 11,122 34,602 34,134  
Third party 87,318 67,722 262,384 195,826  
Net sales 99,644 78,844 296,986 229,960  
Operating costs and expenses:          
Cost of goods sold 84,237 68,716 253,058 198,980  
Operating expenses 2,089 1,573 6,325 6,128  
Segment contribution margin 13,318 8,555 37,603 24,852  
Capital spending (excluding business combinations) 868 $ 464 1,981 $ 972  
Total assets $ 78,598   $ 78,598   $ 78,198