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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Net Sales:          
Affiliate $ 36,694 $ 39,871 $ 75,454 $ 72,151  
Third-Party 75,159 132,263 140,455 243,495  
Net sales 111,853 172,134 215,909 315,646  
Operating costs and expenses:          
Cost of goods sold 73,101 132,494 139,854 240,901  
Operating expenses 8,730 10,798 19,194 21,575  
Segment contribution margin 30,022 28,842 56,861 53,170  
General and administrative expenses 2,698 2,982 5,611 6,391  
Depreciation and amortization 4,812 4,744 9,808 9,244  
Gain on asset disposals 0 (23) (44) (18)  
Operating income 22,512 21,139 41,486 37,553  
Capital spending (excluding business combinations) 848 5,962 1,932 13,535  
Total assets 381,771   381,771   $ 375,288
Pipelines and Transportation [Member]          
Net Sales:          
Affiliate 26,136 26,093 52,442 50,078  
Third-Party 5,874 7,641 12,351 14,658  
Net sales 32,010 33,734 64,793 64,736  
Operating costs and expenses:          
Cost of goods sold 4,814 5,102 9,590 9,915  
Operating expenses 6,899 7,745 14,639 14,663  
Segment contribution margin 20,297 20,887 40,564 40,158  
Capital spending (excluding business combinations) 718 3,057 1,424 7,610  
Total assets 309,678   309,678   283,553
Wholesale Marketing and Terminalling [Member]          
Net Sales:          
Affiliate 10,558 13,778 23,012 22,073  
Third-Party 69,285 124,622 128,104 228,837  
Net sales 79,843 138,400 151,116 250,910  
Operating costs and expenses:          
Cost of goods sold 68,287 127,392 130,264 230,986  
Operating expenses 1,831 3,053 4,555 6,912  
Segment contribution margin 9,725 7,955 16,297 13,012  
Capital spending (excluding business combinations) 130 $ 2,905 508 $ 5,925  
Total assets $ 72,093   $ 72,093   $ 91,735