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Business Segments - Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Total assets:    
Total assets $ 507,901 $ 598,851
Terminalling and storage    
Total assets:    
Total assets 169,671 184,537
Transportation    
Total assets:    
Total assets 161,618 153,451
Sulfur services    
Total assets:    
Total assets 100,144 110,688
Specialty products    
Total assets:    
Total assets $ 76,468 $ 150,175