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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Affiliates (1) [1] $ 88,722 $ 87,629 $ 184,916 $ 194,328  
Third party 79,756 30,008 136,475 86,710  
Net revenues 168,478 117,637 321,391 281,038  
Cost of materials and other 88,695 43,892 169,866 145,185  
Operating expenses (excluding depreciation and amortization presented below) 15,481 12,449 29,537 27,193  
Segment contribution margin 64,302 61,296 121,988 108,660  
General and administrative expenses 6,077 4,721 10,937 10,851  
Depreciation and amortization 9,967 8,694 20,706 14,993  
Other operating income, net (136) 0 (219) (107)  
Operating income 48,394 47,881 90,564 82,923  
Capital spending 2,591 652 10,390 3,681  
Total assets 935,476   935,476   $ 956,417
Pipelines and transportation          
Segment Reporting Information [Line Items]          
Affiliates (1) 65,664 61,394 128,712 99,897  
Third party 4,771 2,032 6,698 11,496  
Net revenues 70,435 63,426 135,410 111,393  
Operating expenses (excluding depreciation and amortization presented below) 10,858 9,731 21,030 21,187  
Segment contribution margin 45,231 42,513 86,955 72,926  
Capital spending 1,531 417 7,376 863  
Total assets 699,588   699,588   723,317
Wholesale marketing and terminalling          
Segment Reporting Information [Line Items]          
Affiliates (1) 23,058 26,235 56,204 94,431  
Third party 74,985 27,976 129,777 75,214  
Net revenues 98,043 54,211 185,981 169,645  
Operating expenses (excluding depreciation and amortization presented below) 4,623 2,718 8,507 6,006  
Segment contribution margin 19,071 18,783 35,033 35,734  
Capital spending 1,060 235 3,014 2,818  
Total assets 214,750   214,750   206,918
Other Segments          
Segment Reporting Information [Line Items]          
Total assets 21,138   21,138   $ 26,182
Service          
Segment Reporting Information [Line Items]          
Cost of materials and other 88,695 43,892 169,866 145,185  
Service | Pipelines and transportation          
Segment Reporting Information [Line Items]          
Cost of materials and other 14,346 11,182 27,425 17,280  
Service | Wholesale marketing and terminalling          
Segment Reporting Information [Line Items]          
Cost of materials and other $ 74,349 $ 32,710 $ 142,441 $ 127,905  
[1] See Note 3 for a description of our material affiliate revenue transactions.