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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Mar. 01, 2018
Segment Reporting Information [Line Items]        
Affiliates (1) [1] $ 62,965 $ 61,644    
Third party 89,518 106,277    
Total revenue 152,483 167,921    
Cost of materials and other 96,265 119,032    
Operating expenses (excluding depreciation and amortization presented below) 16,058 12,577    
Segment contribution margin 40,160 36,312    
General and administrative expenses 4,473 2,975    
Depreciation and amortization 6,574 6,000    
Loss (gain) on asset disposals 2 60    
Operating income 29,111 27,277    
Capital spending [2] 904 2,197    
Total assets 640,208   $ 624,593  
Pipelines and transportation        
Segment Reporting Information [Line Items]        
Affiliates (1) 36,659 29,462    
Third party 3,974 4,251    
Total revenue 40,633 33,713    
Cost of materials and other 5,567 4,441    
Operating expenses (excluding depreciation and amortization presented below) 10,834 9,622    
Segment contribution margin 24,232 19,650    
Capital spending 424 [2] 1,408    
Total assets 401,833   387,333  
Wholesale marketing and terminalling        
Segment Reporting Information [Line Items]        
Affiliates (1) [3] 26,306 32,182    
Third party 85,544 102,026    
Total revenue 111,850 134,208    
Cost of materials and other 90,698 114,591    
Operating expenses (excluding depreciation and amortization presented below) 5,224 2,955    
Segment contribution margin 15,928 16,662    
Capital spending 480 [3] $ 789    
Total assets $ 238,375   $ 237,260  
Big Spring Logistic Assets        
Segment Reporting Information [Line Items]        
Business Acquisition, Transaction Costs       $ 400
[1] See Note 3 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 three months ended March 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.