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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information        
Total revenue $ 195,636 $ 266,996 $ 440,165 $ 546,197
Depreciation and Amortization 12,547 14,800 25,448 29,286
Operating Income (Loss) after Eliminations 17,329 21,490 34,834 46,939
Capital Expenditures and Plant Turnaround Costs 9,795 4,775 17,415 14,710
Terminalling and storage        
Segment Reporting Information        
Total revenue 21,684 20,423 42,542 39,820
Depreciation and Amortization 5,195 7,172 10,794 14,172
Operating Income (Loss) after Eliminations 2,236 (3,276) 2,300 (6,333)
Capital Expenditures and Plant Turnaround Costs 3,324 2,613 7,109 6,365
Transportation segment        
Segment Reporting Information        
Total revenue 54,750 55,832 110,473 102,542
Depreciation and Amortization 3,760 3,590 7,522 7,163
Operating Income (Loss) after Eliminations 5,345 6,154 8,524 7,943
Capital Expenditures and Plant Turnaround Costs 2,471 933 3,999 4,514
Sulfur services        
Segment Reporting Information        
Total revenue 40,330 56,953 76,009 116,076
Depreciation and Amortization 2,756 2,882 5,433 5,591
Operating Income (Loss) after Eliminations 8,493 12,000 15,897 26,837
Capital Expenditures and Plant Turnaround Costs 3,660 1,131 5,708 3,094
Specialty products        
Segment Reporting Information        
Total revenue 78,872 133,788 211,141 287,759
Depreciation and Amortization 836 1,156 1,699 2,360
Operating Income (Loss) after Eliminations 5,149 11,002 16,205 27,004
Capital Expenditures and Plant Turnaround Costs 340 98 599 737
Operating Revenues        
Segment Reporting Information        
Total revenue 201,529 275,295 455,343 562,695
Operating Revenues | Terminalling and storage        
Segment Reporting Information        
Total revenue 23,906 23,622 47,825 45,993
Operating Revenues | Transportation segment        
Segment Reporting Information        
Total revenue 58,395 60,902 120,334 112,799
Operating Revenues | Sulfur services        
Segment Reporting Information        
Total revenue 40,330 56,953 76,009 116,076
Operating Revenues | Specialty products        
Segment Reporting Information        
Total revenue 78,898 133,818 211,175 287,827
Intersegment Revenues Eliminations        
Segment Reporting Information        
Total revenue (5,893) (8,299) (15,178) (16,498)
Intersegment Revenues Eliminations | Terminalling and storage        
Segment Reporting Information        
Total revenue (2,222) (3,199) (5,283) (6,173)
Intersegment Revenues Eliminations | Transportation segment        
Segment Reporting Information        
Total revenue (3,645) (5,070) (9,861) (10,257)
Intersegment Revenues Eliminations | Sulfur services        
Segment Reporting Information        
Total revenue 0 0 0 0
Intersegment Revenues Eliminations | Specialty products        
Segment Reporting Information        
Total revenue (26) (30) (34) (68)
Indirect selling, general and administrative        
Segment Reporting Information        
Depreciation and Amortization 0 0 0 0
Operating Income (Loss) after Eliminations (3,894) (4,390) (8,092) (8,512)
Capital Expenditures and Plant Turnaround Costs $ 0 $ 0 $ 0 $ 0