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Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Goodwill    
Carrying amount of goodwill $ 16,671 $ 16,823
Terminalling and storage    
Goodwill    
Carrying amount of goodwill 10,985 10,985
Sulfur services    
Goodwill    
Carrying amount of goodwill 5,197 5,349
Transportation    
Goodwill    
Carrying amount of goodwill $ 489 $ 489