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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Affiliate [1]                 $ 156,280 $ 149,564 $ 152,564
Third party                 381,795 298,495 437,105
Total pipelines and transportation $ 151,207 $ 130,626 $ 126,769 $ 129,473 $ 124,680 $ 107,470 $ 111,853 $ 104,056 538,075 448,059 589,669
Operating costs and expenses:                      
Cost of goods sold                 372,890 302,158 436,304
Operating expenses                 43,274 37,198 44,923
Segment contribution margin                 121,911 108,703 108,442
General and administrative expenses                 11,840 10,256 11,384
Depreciation and amortization                 21,914 20,813 19,692
(Gain) loss on asset disposals                 (20) (16) 104
Operating income 23,698 $ 22,636 $ 23,371 $ 18,472 19,163 $ 17,001 $ 22,512 $ 18,974 88,177 77,650 77,262
Capital spending (excluding business combinations)                 18,403 11,767 22,427
Total assets 443,530       415,547       443,530 415,547  
Pipelines and Transportation                      
Segment Reporting Information [Line Items]                      
Affiliate                 109,298 103,749 102,551
Third party                 12,431 18,423 28,828
Total pipelines and transportation                 121,729 122,172 131,379
Operating costs and expenses:                      
Cost of goods sold                 18,210 19,425 19,607
Operating expenses                 33,240 29,235 33,751
Segment contribution margin                 70,279 73,512 78,021
Capital spending (excluding business combinations)                 14,262 8,478 16,030
Total assets 349,351       337,349       349,351 337,349  
Wholesale Marketing and Terminalling                      
Segment Reporting Information [Line Items]                      
Affiliate                 46,982 45,815 50,013
Third party                 369,364 280,072 408,277
Total pipelines and transportation                 416,346 325,887 458,290
Operating costs and expenses:                      
Cost of goods sold                 354,680 282,733 416,697
Operating expenses                 10,034 7,963 11,172
Segment contribution margin                 51,632 35,191 30,421
Capital spending (excluding business combinations)                 4,141 3,289 $ 6,397
Total assets $ 94,179       $ 78,198       $ 94,179 $ 78,198  
[1] See Note 4 for a description of our material affiliate revenue transactions.