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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information    
Total revenue $ 180,830 $ 244,529
Depreciation and Amortization 12,649 12,901
Operating Income (Loss) after Eliminations 17,895 17,505
Capital Expenditures and Plant Turnaround Costs 17,393 7,620
Terminalling and storage    
Segment Reporting Information    
Total revenue 22,517 20,858
Transportation    
Segment Reporting Information    
Total revenue 58,307 55,723
Sulfur services    
Segment Reporting Information    
Total revenue 33,681 35,679
Specialty products    
Segment Reporting Information    
Total revenue 66,325 132,269
Operating Segments    
Segment Reporting Information    
Total revenue 186,354 253,814
Operating Segments | Terminalling and storage    
Segment Reporting Information    
Total revenue 24,285 23,919
Depreciation and Amortization 5,395 5,599
Operating Income (Loss) after Eliminations 1,957 64
Capital Expenditures and Plant Turnaround Costs 7,050 3,785
Operating Segments | Transportation    
Segment Reporting Information    
Total revenue 62,042 61,939
Depreciation and Amortization 3,476 3,762
Operating Income (Loss) after Eliminations 6,042 3,179
Capital Expenditures and Plant Turnaround Costs 2,855 1,528
Operating Segments | Sulfur services    
Segment Reporting Information    
Total revenue 33,681 35,679
Depreciation and Amortization 2,982 2,677
Operating Income (Loss) after Eliminations 6,773 7,404
Capital Expenditures and Plant Turnaround Costs 6,336 2,048
Operating Segments | Specialty products    
Segment Reporting Information    
Total revenue 66,346 132,277
Depreciation and Amortization 796 863
Operating Income (Loss) after Eliminations 6,959 11,056
Capital Expenditures and Plant Turnaround Costs 1,152 259
Intersegment Revenues Eliminations    
Segment Reporting Information    
Total revenue (5,524) (9,285)
Intersegment Revenues Eliminations | Terminalling and storage    
Segment Reporting Information    
Total revenue (1,768) (3,061)
Intersegment Revenues Eliminations | Transportation    
Segment Reporting Information    
Total revenue (3,735) (6,216)
Intersegment Revenues Eliminations | Sulfur services    
Segment Reporting Information    
Total revenue 0 0
Intersegment Revenues Eliminations | Specialty products    
Segment Reporting Information    
Total revenue (21) (8)
Indirect selling, general and administrative    
Segment Reporting Information    
Operating Income (Loss) after Eliminations $ (3,836) $ (4,198)