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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information        
Total revenue $ 184,531 $ 195,636 $ 365,361 $ 440,165
Depreciation and Amortization 12,687 12,547 25,336 25,448
Operating Income (Loss) after Eliminations 19,927 17,329 37,822 34,834
Capital Expenditures and Plant Turnaround Costs 13,204 9,795 30,597 17,415
Terminalling and storage        
Segment Reporting Information        
Total revenue 22,375 21,684 44,892 42,542
Transportation        
Segment Reporting Information        
Total revenue 57,676 54,750 115,983 110,473
Sulfur services        
Segment Reporting Information        
Total revenue 37,192 40,330 70,873 76,009
Specialty products        
Segment Reporting Information        
Total revenue 67,288 78,872 133,613 211,141
Operating Segments        
Segment Reporting Information        
Total revenue 190,379 201,529 376,733 455,343
Operating Segments | Terminalling and storage        
Segment Reporting Information        
Total revenue 24,402 23,906 48,687 47,825
Depreciation and Amortization 5,729 5,195 11,124 10,794
Operating Income (Loss) after Eliminations 1,316 2,236 3,273 2,300
Capital Expenditures and Plant Turnaround Costs 2,075 3,324 9,125 7,109
Operating Segments | Transportation        
Segment Reporting Information        
Total revenue 61,467 58,395 123,509 120,334
Depreciation and Amortization 3,381 3,760 6,857 7,522
Operating Income (Loss) after Eliminations 4,226 5,345 10,268 8,524
Capital Expenditures and Plant Turnaround Costs 1,770 2,471 4,625 3,999
Operating Segments | Sulfur services        
Segment Reporting Information        
Total revenue 37,193 40,330 70,874 76,009
Depreciation and Amortization 2,778 2,756 5,760 5,433
Operating Income (Loss) after Eliminations 11,128 8,493 17,901 15,897
Capital Expenditures and Plant Turnaround Costs 8,561 3,660 14,897 5,708
Operating Segments | Specialty products        
Segment Reporting Information        
Total revenue 67,317 78,898 133,663 211,175
Depreciation and Amortization 799 836 1,595 1,699
Operating Income (Loss) after Eliminations 7,076 5,149 14,035 16,205
Capital Expenditures and Plant Turnaround Costs 798 340 1,950 599
Intersegment Revenues Eliminations        
Segment Reporting Information        
Total revenue (5,848) (5,893) (11,372) (15,178)
Intersegment Revenues Eliminations | Terminalling and storage        
Segment Reporting Information        
Total revenue (2,027) (2,222) (3,795) (5,283)
Intersegment Revenues Eliminations | Transportation        
Segment Reporting Information        
Total revenue (3,791) (3,645) (7,526) (9,861)
Intersegment Revenues Eliminations | Sulfur services        
Segment Reporting Information        
Total revenue (1) 0 (1) 0
Intersegment Revenues Eliminations | Specialty products        
Segment Reporting Information        
Total revenue (29) (26) (50) (34)
Indirect selling, general and administrative        
Segment Reporting Information        
Operating Income (Loss) after Eliminations $ (3,819) $ (3,894) $ (7,655) $ (8,092)