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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information    
Total revenue $ 244,529 $ 279,201
Depreciation and Amortization 12,901 14,486
Operating Income (Loss) after Eliminations 17,505 25,449
Capital Expenditures and Plant Turnaround Costs 7,620 9,935
Terminalling and storage    
Segment Reporting Information    
Total revenue 20,858 19,397
Depreciation and Amortization 5,599 7,000
Operating Income (Loss) after Eliminations 64 (3,057)
Capital Expenditures and Plant Turnaround Costs 3,785 3,753
Transportation segment    
Segment Reporting Information    
Total revenue 55,723 46,710
Depreciation and Amortization 3,762 3,573
Operating Income (Loss) after Eliminations 3,179 1,789
Capital Expenditures and Plant Turnaround Costs 1,528 3,581
Sulfur services    
Segment Reporting Information    
Total revenue 35,679 59,123
Depreciation and Amortization 2,677 2,709
Operating Income (Loss) after Eliminations 7,404 14,837
Capital Expenditures and Plant Turnaround Costs 2,048 1,962
Specialty products    
Segment Reporting Information    
Total revenue 132,269 153,971
Depreciation and Amortization 863 1,204
Operating Income (Loss) after Eliminations 11,056 16,002
Capital Expenditures and Plant Turnaround Costs 259 639
Operating Revenues    
Segment Reporting Information    
Total revenue 253,814 287,400
Operating Revenues | Terminalling and storage    
Segment Reporting Information    
Total revenue 23,919 22,371
Operating Revenues | Transportation segment    
Segment Reporting Information    
Total revenue 61,939 51,897
Operating Revenues | Sulfur services    
Segment Reporting Information    
Total revenue 35,679 59,123
Operating Revenues | Specialty products    
Segment Reporting Information    
Total revenue 132,277 154,009
Intersegment Revenues Eliminations    
Segment Reporting Information    
Total revenue (9,285) (8,199)
Intersegment Revenues Eliminations | Terminalling and storage    
Segment Reporting Information    
Total revenue (3,061) (2,974)
Intersegment Revenues Eliminations | Transportation segment    
Segment Reporting Information    
Total revenue (6,216) (5,187)
Intersegment Revenues Eliminations | Sulfur services    
Segment Reporting Information    
Total revenue 0 0
Intersegment Revenues Eliminations | Specialty products    
Segment Reporting Information    
Total revenue (8) (38)
Indirect selling, general and administrative    
Segment Reporting Information    
Depreciation and Amortization 0 0
Operating Income (Loss) after Eliminations (4,198) (4,122)
Capital Expenditures and Plant Turnaround Costs $ 0 $ 0