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Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Affiliates (1) [1] $ 96,194 $ 106,699  
Third party 56,719 56,702  
Net revenues 152,913 163,401  
Cost of materials and other 81,171 101,293  
Operating expenses (excluding depreciation and amortization presented below) 14,056 14,744  
Segment contribution margin 57,686 47,364  
General and administrative expenses 4,860 6,130  
Depreciation and amortization 10,739 6,299  
Other operating income, net (83) (107)  
Operating income 42,170 35,042  
Capital spending 7,799 3,028  
Total assets 948,870   $ 956,417
Pipelines and transportation      
Segment Reporting Information [Line Items]      
Affiliates (1) 63,048 38,502  
Third party 1,927 9,465  
Net revenues 64,975 47,967  
Operating expenses (excluding depreciation and amortization presented below) 10,172 11,456  
Segment contribution margin 41,724 30,413  
Capital spending 5,845 445  
Total assets 705,262   723,317
Wholesale marketing and terminalling      
Segment Reporting Information [Line Items]      
Affiliates (1) 33,146 68,197  
Third party 54,792 47,237  
Net revenues 87,938 115,434  
Operating expenses (excluding depreciation and amortization presented below) 3,884 3,288  
Segment contribution margin 15,962 16,951  
Capital spending 1,954 2,583  
Total assets 217,384   206,918
Other Segments      
Segment Reporting Information [Line Items]      
Total assets 26,224   $ 26,182
Service      
Segment Reporting Information [Line Items]      
Cost of materials and other 81,171 101,293  
Service | Pipelines and transportation      
Segment Reporting Information [Line Items]      
Cost of materials and other 13,079 6,098  
Service | Wholesale marketing and terminalling      
Segment Reporting Information [Line Items]      
Cost of materials and other $ 68,092 $ 95,195  
[1] See Note 3 for a description of our material affiliate revenue transactions.