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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Affiliates (1) [1] $ 95,410 $ 66,647 $ 289,739 $ 191,530  
Third party 46,858 70,909 133,567 253,852  
Net revenues 142,268 137,556 423,306 445,382  
Cost of materials and other 60,692 72,594 205,877 262,713  
Operating expenses (excluding depreciation and amortization presented below) 14,230 18,435 41,423 51,820  
Segment contribution margin 67,346 46,527 176,006 130,849  
General and administrative expenses 6,122 5,280 16,973 15,046  
Depreciation and amortization 9,459 6,588 24,452 19,801  
Gain on asset disposals 0 (70) (107) (95)  
Other Operating Income (Expense), Net 0 70 107 95  
Operating income 51,765 34,729 134,688 96,097  
Capital spending 3,228 3,992 6,918 6,238  
Total assets 957,586   957,586   $ 744,447
Pipelines and transportation          
Segment Reporting Information [Line Items]          
Affiliates (1) 68,444 39,304 168,285 112,694  
Third party 3,035 5,281 14,587 16,733  
Net revenues 71,479 44,585 182,872 129,427  
Operating expenses (excluding depreciation and amortization presented below) 10,749 12,547 31,936 36,109  
Segment contribution margin 46,388 27,091 119,314 75,447  
Capital spending 2,552 3,103 3,424 4,345  
Total assets 804,118   804,118   537,580
Wholesale marketing and terminalling          
Segment Reporting Information [Line Items]          
Affiliates (1) 26,966 27,343 121,454 78,836  
Third party 43,823 65,628 118,980 237,119  
Net revenues 70,789 92,971 240,434 315,955  
Operating expenses (excluding depreciation and amortization presented below) 3,481 5,888 9,487 15,711  
Segment contribution margin 20,958 19,436 56,692 55,402  
Capital spending 676 889 3,494 1,893  
Total assets 153,468   153,468   $ 206,867
Service          
Segment Reporting Information [Line Items]          
Cost of materials and other 60,692 72,594 205,877 262,713  
Service | Pipelines and transportation          
Segment Reporting Information [Line Items]          
Cost of materials and other 14,342 4,947 31,622 17,871  
Service | Wholesale marketing and terminalling          
Segment Reporting Information [Line Items]          
Cost of materials and other $ 46,350 $ 67,647 $ 174,255 $ 244,842  
[1] See Note 3 for a description of our material affiliate revenue transactions.