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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Net Sales:          
Affiliate $ 36,360 $ 41,824 $ 111,814 $ 113,975  
Third-Party 71,110 123,268 211,565 366,763  
Net sales 107,470 165,092 323,379 480,738  
Operating costs and expenses:          
Cost of goods sold 73,527 124,385 213,381 365,286  
Operating expenses 9,251 11,616 28,445 33,191  
Segment contribution margin 24,692 29,091 81,553 82,261  
General and administrative expenses 2,307 2,703 7,918 9,094  
Depreciation and amortization 5,356 4,541 15,164 13,785  
Loss (gain) on asset disposals 28 0 (16) (18)  
Operating income 17,001 21,847 58,487 59,400  
Capital spending (excluding business combinations) 3,077 4,195 5,009 17,730  
Total assets 393,170   393,170   $ 375,288
Pipelines and Transportation [Member]          
Net Sales:          
Affiliate 25,238 26,358 77,680 76,436  
Third-Party 3,388 7,581 15,739 22,239  
Net sales 28,626 33,939 93,419 98,675  
Operating costs and expenses:          
Cost of goods sold 4,811 5,211 14,401 15,126  
Operating expenses 7,678 8,368 22,317 23,031  
Segment contribution margin 16,137 20,360 56,701 60,518  
Capital spending (excluding business combinations) 2,613 2,872 4,037 12,627  
Total assets 327,757   327,757   283,553
Wholesale Marketing and Terminalling [Member]          
Net Sales:          
Affiliate 11,122 15,466 34,134 37,539  
Third-Party 67,722 115,687 195,826 344,524  
Net sales 78,844 131,153 229,960 382,063  
Operating costs and expenses:          
Cost of goods sold 68,716 119,174 198,980 350,160  
Operating expenses 1,573 3,248 6,128 10,160  
Segment contribution margin 8,555 8,731 24,852 21,743  
Capital spending (excluding business combinations) 464 $ 1,323 972 $ 5,103  
Total assets $ 65,413   $ 65,413   $ 91,735