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Business Segments - Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Total assets:    
Total assets $ 579,861 $ 579,638
Terminalling and storage    
Total assets:    
Total assets 248,194 252,794
Natural gas liquids    
Total assets:    
Total assets 78,483 80,737
Sulfur services    
Total assets:    
Total assets 108,007 94,154
Transportation    
Total assets:    
Total assets $ 145,177 $ 151,953