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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Net Sales:          
Affiliate $ 39,824 $ 36,694 $ 76,443 $ 75,454  
Third party 86,945 75,159 179,799 140,455  
Total 126,769 111,853 256,242 215,909  
Operating costs and expenses:          
Cost of goods sold 85,039 73,101 177,629 139,854  
Operating expenses 9,966 8,730 20,324 19,194  
Segment contribution margin 31,764 30,022 58,289 56,861  
General and administrative expenses 2,656 2,698 5,504 5,611  
Depreciation and amortization 5,742 4,812 10,935 9,808  
(Gain) loss on asset disposals (5) 0 7 (44)  
Operating income 23,371 22,512 41,843 41,486  
Capital spending (excluding business combinations) 2,119 848 4,910 1,932  
Total assets 415,532   415,532   $ 415,547
Pipelines and Transportation [Member]          
Net Sales:          
Affiliate 27,668 26,136 54,168 52,442  
Third party 2,555 5,874 4,732 12,351  
Total 30,223 32,010 58,900 64,793  
Operating costs and expenses:          
Cost of goods sold 4,403 4,814 8,808 9,590  
Operating expenses 7,933 6,899 16,088 14,639  
Segment contribution margin 17,887 20,297 34,004 40,564  
Capital spending (excluding business combinations) 1,660 718 3,797 1,424  
Total assets 338,781   338,781   337,349
Wholesale Marketing and Terminalling [Member]          
Net Sales:          
Affiliate 12,156 10,558 22,275 23,012  
Third party 84,390 69,285 175,067 128,104  
Total 96,546 79,843 197,342 151,116  
Operating costs and expenses:          
Cost of goods sold 80,636 68,287 168,821 130,264  
Operating expenses 2,033 1,831 4,236 4,555  
Segment contribution margin 13,877 9,725 24,285 16,297  
Capital spending (excluding business combinations) 459 $ 130 1,113 $ 508  
Total assets $ 76,751   $ 76,751   $ 78,198