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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Affiliates (1) [1] $ 123,519 $ 95,410 $ 308,435 $ 289,739  
Third party 66,108 46,858 202,583 133,567  
Net revenues 189,627 142,268 511,018 423,306  
Cost of materials and other 105,129 60,692 274,995 205,877  
Operating expenses (excluding depreciation and amortization presented below) 17,345 14,230 46,942 41,423  
Segment contribution margin 67,153 67,346 189,081 176,006  
General and administrative expenses 6,141 6,122 17,018 16,973  
Depreciation and amortization 10,156 9,459 30,862 24,452  
Other operating expense (income), net 273 0 54 (107)  
Operating income 50,583 51,765 141,147 134,688  
Capital spending 4,136 3,228 14,526 6,918  
Total assets 930,543   930,543   $ 956,417
Pipelines and transportation          
Segment Reporting Information [Line Items]          
Affiliates (1) 70,879 68,444 199,591 168,285  
Third party 5,323 3,035 12,021 14,587  
Net revenues 76,202 71,479 211,612 182,872  
Operating expenses (excluding depreciation and amortization presented below) 13,680 10,749 34,710 31,936  
Segment contribution margin 47,352 46,388 134,307 119,314  
Capital spending 2,570 2,552 9,946 3,424  
Total assets 692,901   692,901   723,317
Wholesale marketing and terminalling          
Segment Reporting Information [Line Items]          
Affiliates (1) 52,640 26,966 108,844 121,454  
Third party 60,785 43,823 190,562 118,980  
Net revenues 113,425 70,789 299,406 240,434  
Operating expenses (excluding depreciation and amortization presented below) 3,665 3,481 12,232 9,487  
Segment contribution margin 19,801 20,958 54,774 56,692  
Capital spending 1,566 676 4,580 3,494  
Total assets 213,277   213,277   206,918
Other Segments          
Segment Reporting Information [Line Items]          
Total assets 24,365   24,365   $ 26,182
Service          
Segment Reporting Information [Line Items]          
Cost of materials and other 105,129 60,692 274,995 205,877  
Service | Pipelines and transportation          
Segment Reporting Information [Line Items]          
Cost of materials and other 15,170 14,342 42,595 31,622  
Service | Wholesale marketing and terminalling          
Segment Reporting Information [Line Items]          
Cost of materials and other $ 89,959 $ 46,350 $ 232,400 $ 174,255  
[1] See Note 3 for a description of our material affiliate revenue transactions.