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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information        
Total revenue $ 176,697 $ 229,305 $ 616,862 $ 775,502
Depreciation and Amortization 12,223 13,721 37,671 43,007
Operating Income (Loss) after Eliminations 14,704 (12,244) 49,538 34,695
Capital Expenditures and Plant Turnaround Costs   9,582 28,081 24,292
Terminalling and storage        
Segment Reporting Information        
Total revenue 22,202 19,988 64,744 59,808
Transportation        
Segment Reporting Information        
Total revenue 55,223 58,993 165,696 161,535
Sulfur services        
Segment Reporting Information        
Total revenue 32,577 28,868 108,586 144,944
Specialty products        
Segment Reporting Information        
Total revenue 66,695 121,456 277,836 409,215
Operating Segments        
Segment Reporting Information        
Total revenue 181,811 236,899 637,154 799,594
Depreciation and Amortization 12,223      
Operating Income (Loss) after Eliminations 14,704      
Capital Expenditures and Plant Turnaround Costs 10,666      
Operating Segments | Terminalling and storage        
Segment Reporting Information        
Total revenue 23,973 23,034 71,798 69,027
Depreciation and Amortization 5,102 6,200 15,896 20,372
Operating Income (Loss) after Eliminations 1,357 (3,046) 3,657 (9,379)
Capital Expenditures and Plant Turnaround Costs 2,684 5,593 9,793 11,958
Operating Segments | Transportation        
Segment Reporting Information        
Total revenue 58,541 63,514 178,875 176,313
Depreciation and Amortization 3,674 3,598 11,196 10,761
Operating Income (Loss) after Eliminations 3,323 7,528 11,847 15,471
Capital Expenditures and Plant Turnaround Costs 1,939 1,682 5,938 6,196
Operating Segments | Sulfur services        
Segment Reporting Information        
Total revenue 32,577 28,868 108,586 144,944
Depreciation and Amortization 2,639 2,786 8,072 8,377
Operating Income (Loss) after Eliminations 5,993 (3,943) 21,890 22,894
Capital Expenditures and Plant Turnaround Costs 5,015 2,204 10,723 5,298
Operating Segments | Specialty products        
Segment Reporting Information        
Total revenue 66,720 121,483 277,895 409,310
Depreciation and Amortization 808 1,137 2,507 3,497
Operating Income (Loss) after Eliminations 7,868 (8,523) 24,073 18,481
Capital Expenditures and Plant Turnaround Costs 1,028 103 1,627 840
Intersegment Revenues Eliminations        
Segment Reporting Information        
Total revenue (5,114) (7,594) (20,292) (24,092)
Intersegment Revenues Eliminations | Terminalling and storage        
Segment Reporting Information        
Total revenue (1,771) (3,046) (7,054) (9,219)
Intersegment Revenues Eliminations | Transportation        
Segment Reporting Information        
Total revenue (3,318) (4,521) (13,179) (14,778)
Intersegment Revenues Eliminations | Sulfur services        
Segment Reporting Information        
Total revenue 0 0 0 0
Intersegment Revenues Eliminations | Specialty products        
Segment Reporting Information        
Total revenue (25) (27) (59) (95)
Indirect selling, general and administrative        
Segment Reporting Information        
Depreciation and Amortization     0  
Operating Income (Loss) after Eliminations $ (3,837) $ (4,260) (11,929) $ (12,772)
Capital Expenditures and Plant Turnaround Costs     $ 0