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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue |  |  |  |
Total revenues |  | $ 707,622 | $ 797,963 | $ 1,018,878
Throughput and storage |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | [1] | 89,067 | 86,514 | 80,193
Sulfur services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 14,572 | 13,430 | 12,337
Terminalling and storage segment |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 89,067 | 86,514 | 80,193
Terminalling and storage segment | Throughput and storage |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 89,067 | 86,514 | 80,193
Transportation segment |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 223,934 | 223,677 | 219,008
Transportation segment | Land transportation |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 165,353 | 166,717 | 166,631
Transportation segment | Inland transportation |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 51,826 | 50,890 | 45,050
Transportation segment | Offshore transportation |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 6,755 | 6,070 | 7,327
Sulfur service segment |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 129,771 | 140,995 | 179,164
Sulfur service segment | Sulfur product sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 31,347 | 30,170 | 42,247
Sulfur service segment | Fertilizer product sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 83,852 | 97,395 | 124,580
Sulfur service segment | Sulfur services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 14,572 | 13,430 | 12,337
Specialty products segment |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 264,850 | 346,777 | 540,513
Specialty products segment | Natural gas liquids product sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | 144,238 | 214,713 | 398,422
Specialty products segment | Lubricant product sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues |  | $ 120,612 | $ 132,064 | $ 142,091
[1] | Related Party Transactions Included Above
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
Revenues: |  |  |  |  |
Terminalling and storage | $ | 71,799 |  |  | $ | 72,138 |  |  | $ | 66,867 |
Transportation | 33,250 |  |  | 29,276 |  |  | 28,393 |
Sulfur Services | 664 |  |  | — |  |  | — |
Product sales | 457 |  |  | 8,767 |  |  | 554 |
Costs and expenses: |  |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Specialty products | 31,789 |  |  | 35,930 |  |  | 39,356 |
Sulfur services | 11,915 |  |  | 11,182 |  |  | 10,717 |
Terminalling and storage | 72 |  |  | 75 |  |  | 19 |
Expenses: |  |  |  |  |
Operating expenses | 106,831 |  |  | 100,851 |  |  | 93,630 |
Selling, general and administrative | 39,385 |  |  | 32,021 |  |  | 31,758 |

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