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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 01, 2018
Dec. 31, 2017
Net Sales:        
Affiliate $ 61,644 $ 36,619    
Third party 106,277 92,854    
Net revenues 167,921 129,473    
Operating costs and expenses:        
Cost of goods sold 119,032 92,590    
Operating expenses 12,577 10,358    
Segment contribution margin 36,312 26,525    
General and administrative expenses 2,975 2,848    
Depreciation and amortization 6,000 5,193    
Loss on asset disposals 60 12    
Operating income 27,277 18,472    
Capital spending (excluding business combinations) (1) [1] 2,197 2,791    
Total assets 665,946     $ 443,530
Pipelines and transportation        
Net Sales:        
Affiliate 29,462 26,500    
Third party 4,251 2,177    
Net revenues 33,713 28,677    
Operating costs and expenses:        
Cost of goods sold 4,441 4,405    
Operating expenses 9,622 8,155    
Segment contribution margin 19,650 16,117    
Capital spending (excluding business combinations) (1) 1,408 2,137    
Total assets 417,781     349,351
Wholesale marketing and terminalling        
Net Sales:        
Affiliate 32,182 10,119    
Third party 102,026 90,677    
Net revenues 134,208 100,796    
Operating costs and expenses:        
Cost of goods sold 114,591 88,185    
Operating expenses 2,955 2,203    
Segment contribution margin 16,662 10,408    
Capital spending (excluding business combinations) (1) 789 $ 654    
Total assets $ 248,165     $ 94,179
Big Spring Pipeline        
Segment Reporting Information [Line Items]        
Business Acquisition, Transaction Costs     $ 400  
[1] Capital spending excludes transaction costs capitalized in the amount of $0.4 million that relate to the Big Spring Assets Acquisition.