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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Affiliate [1]                 $ 240,809 $ 156,280 $ 149,564
Third party                 416,800 381,795 298,495
Net revenues $ 159,298 $ 164,110 $ 166,280 $ 167,921 $ 151,207 $ 130,626 $ 126,769 $ 129,473 657,609 538,075 448,059
Cost of materials and other                 429,061 372,890 302,158
Operating expenses (excluding depreciation and amortization)                 58,744 43,274 37,198
Segment contribution margin                 169,804 121,911 108,703
General and administrative expenses                 17,166 11,840 10,256
Depreciation and amortization                 25,990 21,914 20,813
Loss (gain) on asset disposals                 891 (20) (16)
Operating income 31,147 $ 32,624 $ 34,710 $ 27,277 23,698 $ 22,636 $ 23,371 $ 18,472 125,757 88,177 77,650
Capital spending [2]                 11,565 18,403 11,767
Total assets 624,593       443,530       624,593 443,530  
Pipelines and Transportation                      
Segment Reporting Information [Line Items]                      
Affiliate                 138,418 109,298 103,749
Third party                 15,149 12,431 18,423
Net revenues                 153,567 121,729 122,172
Cost of materials and other                 19,878 18,210 19,425
Operating expenses (excluding depreciation and amortization)                 39,934 33,240 29,235
Segment contribution margin                 93,755 70,279 73,512
Capital spending [2]                   14,262 8,478
Total assets 387,333       349,351       387,333 349,351  
Wholesale Marketing and Terminalling                      
Segment Reporting Information [Line Items]                      
Affiliate [3]                 102,391 46,982 45,815
Third party                 401,651 369,364 280,072
Net revenues                 504,042 416,346 325,887
Cost of materials and other                 409,183 354,680 282,733
Operating expenses (excluding depreciation and amortization)                 18,810 10,034 7,963
Segment contribution margin                 76,049 51,632 35,191
Capital spending [2]                 6,840 4,141 $ 3,289
Total assets 237,260       $ 94,179       237,260 $ 94,179  
Big Spring Logistic Assets                      
Segment Reporting Information [Line Items]                      
Capitalized acquisition costs $ 400               $ 400    
[1] See Note 4 for a description of our material affiliate revenue transactions.
[2] Capital spending excludes transaction costs capitalized in the amount of $0.4 million that relate to the Big Spring Logistic Assets Acquisition for the year ended December 31, 2018.
[3] Affiliate revenue for the wholesale marketing and terminalling segment is presented net of amortization expense pertaining to the Marketing Contract Intangible Acquisition. See Note 3 for additional information.