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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Affiliate [1]                 $ 149,564 $ 152,564 $ 114,583
Third party                 298,495 437,105 726,670
Total pipelines and transportation $ 124,680 $ 107,470 $ 111,853 $ 104,056 $ 108,931 $ 165,092 $ 172,134 $ 143,512 448,059 589,669 841,253
Operating costs and expenses:                      
Cost of goods sold                 302,158 436,304 697,221
Operating expenses                 37,198 44,923 39,465
Segment Contribution Margin                 108,703 108,442 104,567
General and administrative expenses                 10,256 11,384 10,616
Depreciation and amortization                 20,813 19,692 15,022
(Gain) loss on asset disposals                 (16) 104 83
Operating income 19,163 $ 17,001 $ 22,512 $ 18,974 17,862 $ 21,847 $ 21,139 $ 16,414 77,650 77,262 78,846
Capital spending (excluding business combinations)                 11,767 22,427 9,168
Total assets 415,547       375,288       415,547 375,288  
Pipelines and Transportation                      
Segment Reporting Information [Line Items]                      
Affiliate                 103,749 102,551 80,683
Third party                 18,423 28,828 10,665
Total pipelines and transportation                 122,172 131,379 91,348
Operating costs and expenses:                      
Cost of goods sold                 19,425 19,607 4,294
Operating expenses                 29,235 33,751 31,979
Segment Contribution Margin                 73,512 78,021 55,075
Capital spending (excluding business combinations)                 8,478 16,030 5,804
Total assets 337,349       283,553       337,349 283,553  
Wholesale Marketing and Terminalling                      
Segment Reporting Information [Line Items]                      
Affiliate                 45,815 50,013 33,900
Third party                 280,072 408,277 716,005
Total pipelines and transportation                 325,887 458,290 749,905
Operating costs and expenses:                      
Cost of goods sold                 282,733 416,697 692,927
Operating expenses                 7,963 11,172 7,486
Segment Contribution Margin                 35,191 30,421 49,492
Capital spending (excluding business combinations)                 3,289 6,397 $ 3,364
Total assets $ 78,198       $ 91,735       $ 78,198 $ 91,735  
[1] See Note 4 for a description of our material affiliate revenue transactions.