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Business Segments - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Total assets:    
Total assets $ 512,077 $ 509,375
Terminalling and storage    
Total assets:    
Total assets 171,078 171,320
Transportation    
Total assets:    
Total assets 158,127 161,506
Sulfur services    
Total assets:    
Total assets 107,519 103,779
Specialty products    
Total assets:    
Total assets $ 75,353 $ 72,770