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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information        
Total revenue $ 229,305 $ 211,258 $ 775,502 $ 596,525
Depreciation and Amortization 13,721 13,945 43,007 42,862
Operating Income (Loss) after Eliminations (12,244) 8,153 34,695 31,472
Capital Expenditures and Plant Turnaround Costs 9,582 4,297 24,292 14,409
Terminalling and storage        
Segment Reporting Information        
Total revenue 60,553 49,578 169,989 131,666
Depreciation and Amortization 6,747 7,049 22,084 21,150
Operating Income (Loss) after Eliminations 4,735 3,269 11,670 8,153
Capital Expenditures and Plant Turnaround Costs 5,633 2,087 12,078 6,258
Transportation segment        
Segment Reporting Information        
Total revenue 58,993 39,079 161,535 103,820
Depreciation and Amortization 3,598 3,710 10,761 12,039
Operating Income (Loss) after Eliminations 7,527 430 15,470 (7,782)
Capital Expenditures and Plant Turnaround Costs 1,682 1,086 6,196 2,702
Sulfur services        
Segment Reporting Information        
Total revenue 28,868 30,837 144,944 103,958
Depreciation and Amortization 2,786 2,594 8,377 7,882
Operating Income (Loss) after Eliminations (3,943) 4,534 22,894 21,136
Capital Expenditures and Plant Turnaround Costs 2,204 1,104 5,298 4,968
Natural gas liquids        
Segment Reporting Information        
Total revenue 80,891 91,764 299,034 257,081
Depreciation and Amortization 590 592 1,785 1,791
Operating Income (Loss) after Eliminations (16,303) 3,994 (2,567) 21,738
Capital Expenditures and Plant Turnaround Costs 63 20 720 481
Operating Revenues        
Segment Reporting Information        
Total revenue 235,422 216,395 795,236 612,509
Operating Revenues | Terminalling and storage        
Segment Reporting Information        
Total revenue 62,149 51,226 174,942 136,584
Operating Revenues | Transportation segment        
Segment Reporting Information        
Total revenue 63,514 42,568 176,313 114,886
Operating Revenues | Sulfur services        
Segment Reporting Information        
Total revenue 28,868 30,837 144,944 103,958
Operating Revenues | Natural gas liquids        
Segment Reporting Information        
Total revenue 80,891 91,764 299,037 257,081
Intersegment Revenues Eliminations        
Segment Reporting Information        
Total revenue (6,117) (5,137) (19,734) (15,984)
Intersegment Revenues Eliminations | Terminalling and storage        
Segment Reporting Information        
Total revenue (1,596) (1,648) (4,953) (4,918)
Intersegment Revenues Eliminations | Transportation segment        
Segment Reporting Information        
Total revenue (4,521) (3,489) (14,778) (11,066)
Intersegment Revenues Eliminations | Sulfur services        
Segment Reporting Information        
Total revenue 0 0 0 0
Intersegment Revenues Eliminations | Natural gas liquids        
Segment Reporting Information        
Total revenue 0 0 (3) 0
Indirect selling, general and administrative        
Segment Reporting Information        
Depreciation and Amortization 0 0 0 0
Operating Income (Loss) after Eliminations (4,260) (4,074) (12,772) (11,773)
Capital Expenditures and Plant Turnaround Costs $ 0 $ 0 $ 0 $ 0