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Business Segments - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Total assets:    
Total assets $ 542,875 $ 598,851
Terminalling and storage    
Total assets:    
Total assets 172,182 184,537
Transportation segment    
Total assets:    
Total assets 145,963 153,451
Sulfur services    
Total assets:    
Total assets 113,602 110,688
Specialty products    
Total assets:    
Total assets $ 111,128 $ 150,175