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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information        
Total revenue $ 170,934 $ 176,697 $ 536,295 $ 616,862
Depreciation and Amortization 12,608 12,223 37,944 37,671
Operating Income (Loss) after Eliminations 12,651 14,704 50,473 49,538
Capital Expenditures and Plant Turnaround Costs 12,535 10,666 43,132 28,081
Terminalling and storage        
Segment Reporting Information        
Total revenue 22,562 22,202 67,454 64,744
Transportation        
Segment Reporting Information        
Total revenue 56,506 55,223 172,489 165,696
Sulfur services        
Segment Reporting Information        
Total revenue 24,660 32,577 95,533 108,586
Specialty products        
Segment Reporting Information        
Total revenue 67,206 66,695 200,819 277,836
Operating Segments        
Segment Reporting Information        
Total revenue 176,495 181,811 553,228 637,154
Operating Segments | Terminalling and storage        
Segment Reporting Information        
Total revenue 24,414 23,973 73,101 71,798
Depreciation and Amortization 5,695 5,102 16,819 15,896
Operating Income (Loss) after Eliminations 914 1,357 4,187 3,657
Capital Expenditures and Plant Turnaround Costs 2,193 2,684 11,318 9,793
Operating Segments | Transportation        
Segment Reporting Information        
Total revenue 60,196 58,541 183,705 178,875
Depreciation and Amortization 3,182 3,674 10,039 11,196
Operating Income (Loss) after Eliminations 4,858 3,323 15,126 11,847
Capital Expenditures and Plant Turnaround Costs 1,929 1,939 6,554 5,938
Operating Segments | Sulfur services        
Segment Reporting Information        
Total revenue 24,660 32,577 95,534 108,586
Depreciation and Amortization 2,937 2,639 8,697 8,072
Operating Income (Loss) after Eliminations 4,719 5,993 22,620 21,890
Capital Expenditures and Plant Turnaround Costs 7,929 5,015 22,826 10,723
Operating Segments | Specialty products        
Segment Reporting Information        
Total revenue 67,225 66,720 200,888 277,895
Depreciation and Amortization 794 808 2,389 2,507
Operating Income (Loss) after Eliminations 5,902 7,868 19,937 24,073
Capital Expenditures and Plant Turnaround Costs 484 1,028 2,434 1,627
Intersegment Revenues Eliminations        
Segment Reporting Information        
Total revenue (5,561) (5,114) (16,933) (20,292)
Intersegment Revenues Eliminations | Terminalling and storage        
Segment Reporting Information        
Total revenue (1,852) (1,771) (5,647) (7,054)
Intersegment Revenues Eliminations | Transportation        
Segment Reporting Information        
Total revenue (3,690) (3,318) (11,216) (13,179)
Intersegment Revenues Eliminations | Sulfur services        
Segment Reporting Information        
Total revenue 0 0 (1) 0
Intersegment Revenues Eliminations | Specialty products        
Segment Reporting Information        
Total revenue (19) (25) (69) (59)
Indirect selling, general and administrative        
Segment Reporting Information        
Operating Income (Loss) after Eliminations $ (3,742) $ (3,837) $ (11,397) $ (11,929)