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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Net Sales:      
Affiliate $ 38,760 $ 32,280  
Third-Party 65,296 111,232  
Net sales 104,056 143,512  
Operating costs and expenses:      
Cost of goods sold 66,753 108,407  
Operating expenses 10,464 10,777  
Segment contribution margin 26,839 24,328  
Capital spending (excluding business combinations) 1,084 7,573  
General and administrative expenses 2,913 3,409  
Depreciation and amortization 4,996 4,500  
(Gain) loss on asset disposals (44) 5  
Operating income 18,974 16,414  
Total assets 379,200   $ 375,288
Pipelines and Transportation [Member]      
Net Sales:      
Affiliate 26,306 23,985  
Third-Party 6,477 7,017  
Net sales 32,783 31,002  
Operating costs and expenses:      
Cost of goods sold 4,776 4,813  
Operating expenses 7,740 6,918  
Segment contribution margin 20,267 19,271  
Capital spending (excluding business combinations) 706 4,553  
Total assets 298,984   283,553
Wholesale Marketing and Terminalling [Member]      
Net Sales:      
Affiliate 12,454 8,295  
Third-Party 58,819 104,215  
Net sales 71,273 112,510  
Operating costs and expenses:      
Cost of goods sold 61,977 103,594  
Operating expenses 2,724 3,859  
Segment contribution margin 6,572 5,057  
Capital spending (excluding business combinations) 378 $ 3,020  
Total assets $ 80,216   $ 91,735