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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Affiliates (1) [1] $ 61,918 $ 53,080 $ 124,883 $ 114,724  
Third party 93,424 113,200 182,942 219,477  
Total revenue 155,342 166,280 307,825 334,201  
Cost of materials and other 93,854 106,016 190,119 225,048  
Operating expenses (excluding depreciation and amortization presented below) 17,327 14,917 33,385 27,494  
Segment contribution margin 44,161 45,347 84,321 81,659  
General and administrative expenses 5,293 3,747 9,766 6,722  
Depreciation and amortization 6,639 7,019 13,213 13,019  
Gain on asset disposals (27) (129) (25) (69)  
Operating income 32,256 34,710 61,367 61,987  
Capital spending [2] 1,342 2,252 2,246 4,449  
Total assets 769,310   769,310   $ 624,593
Pipelines and transportation          
Segment Reporting Information [Line Items]          
Affiliates (1) 36,731 34,030 73,390 63,492  
Third party 7,477 3,714 11,451 7,965  
Total revenue 44,208 37,744 84,841 71,457  
Cost of materials and other 7,357 5,195 12,924 9,636  
Operating expenses (excluding depreciation and amortization presented below) 12,728 9,933 23,562 19,555  
Segment contribution margin 24,123 22,616 48,355 42,266  
Capital spending [2] 818 826 1,004 2,234  
Total assets 525,070   525,070   387,333
Wholesale marketing and terminalling          
Segment Reporting Information [Line Items]          
Affiliates (1) [3] 25,187 19,050 51,493 51,232  
Third party 85,947 109,486 171,491 211,512  
Total revenue 111,134 128,536 222,984 262,744  
Cost of materials and other 86,497 100,821 177,195 215,412  
Operating expenses (excluding depreciation and amortization presented below) 4,599 4,984 9,823 7,939  
Segment contribution margin 20,038 22,731 35,966 39,393  
Capital spending [2] 524 1,426 1,242 2,215  
Total assets $ 244,240   $ 244,240   $ 237,260
Big Spring Logistic Assets          
Segment Reporting Information [Line Items]          
Business Acquisition, Transaction Costs   $ 400   $ 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 six months ended June 30, 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.