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Business Segments - Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Total assets:    
Total assets $ 636,161 $ 579,861
Terminalling and storage    
Total assets:    
Total assets 244,362 248,194
Transportation segment    
Total assets:    
Total assets 155,382 145,177
Sulfur services    
Total assets:    
Total assets 115,409 108,007
Natural gas liquids    
Total assets:    
Total assets $ 121,008 $ 78,483