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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Sep. 15, 2017
Segment Reporting Information [Line Items]            
Affiliates $ 63,835 $ 40,131 $ 178,559 $ 116,574    
Third party 100,275 90,495 319,752 270,294    
Total revenue 164,110 130,626 498,311 386,868    
Cost of materials and other 105,596 89,120 330,644 266,749    
Operating expenses (excluding depreciation and amortization presented below) 15,395 10,662 42,889 30,986    
Segment contribution margin 43,119 30,844 124,778 89,133    
General and administrative expenses 3,076 2,751 9,798 8,255    
Depreciation and amortization 6,702 5,462 19,721 16,397    
Loss (gain) on asset disposals 717 (5) 648 2    
Operating income 32,624 22,636 94,611 64,479    
Capital spending [1] 2,991 3,786 7,440 8,696    
Total assets 693,569   693,569   $ 443,530  
Pipelines and transportation            
Segment Reporting Information [Line Items]            
Affiliates 36,132 27,805 99,624 81,972    
Third party 3,653 3,177 11,618 7,910    
Total revenue 39,785 30,982 111,242 89,882    
Cost of materials and other 5,055 4,883 14,691 13,691    
Operating expenses (excluding depreciation and amortization presented below) 9,499 8,573 29,054 24,661    
Segment contribution margin 25,231 17,526 66,839 51,530    
Capital spending 2,086 [1] 2,918 4,320 [1] 6,715    
Total assets 431,173   431,173   349,351  
Wholesale marketing and terminalling            
Segment Reporting Information [Line Items]            
Affiliates [2] 27,703 12,326 78,935 34,602    
Third party 96,622 87,318 308,134 262,384    
Total revenue 124,325 99,644 387,069 296,986    
Cost of materials and other 100,541 84,237 315,953 253,058    
Operating expenses (excluding depreciation and amortization presented below) 5,896 2,089 13,835 6,325    
Segment contribution margin 17,888 13,318 57,281 37,603    
Capital spending 905 [2] $ 868 3,120 [2] $ 1,981    
Total assets $ 262,396   $ 262,396   $ 94,179  
Big Spring Pipeline            
Segment Reporting Information [Line Items]            
Total assets           $ 9,003
[1] Capital spending excludes transaction costs capitalized in the amount of $0.4 million that relate to the Big Spring Logistic Assets Acquisition for the nine months ended September 30, 2018. No costs were capitalized during the three months ended September 30, 2018.
[2] 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.