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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | $ 170,934 | $ 176,697 | $ 536,295 | $ 616,862
Throughput and storage |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues | [1] | 22,562 | 22,202 | 67,454 | 64,744
Sulfur services |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 3,477 | 3,358 | 10,431 | 10,073
Terminalling and storage segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 22,562 | 22,202 | 67,454 | 64,744
Terminalling and storage segment | Throughput and storage |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 22,562 | 22,202 | 67,454 | 64,744
Transportation segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 56,506 | 55,223 | 172,489 | 165,696
Transportation segment | Land transportation |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 40,514 | 40,965 | 126,117 | 124,064
Transportation segment | Inland marine transportation |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 14,146 | 12,658 | 41,446 | 37,093
Transportation segment | Offshore marine transportation |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 1,846 | 1,600 | 4,926 | 4,539
Sulfur services segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 24,660 | 32,577 | 95,533 | 108,586
Sulfur services segment | Sulfur product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 8,585 | 8,453 | 21,789 | 22,191
Sulfur services segment | Fertilizer product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 12,598 | 20,766 | 63,313 | 76,322
Sulfur services segment | Sulfur services |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 3,477 | 3,358 | 10,431 | 10,073
Specialty products segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 67,206 | 66,695 | 200,819 | 277,836
Specialty products segment | Natural gas liquids product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | 35,940 | 31,225 | 109,506 | 175,125
Specialty products segment | Lubricant product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Total revenues |  | $ 31,266 | $ 35,470 | $ 91,313 | $ 102,711
[1] | Related Party Transactions Included Above
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Revenues:* |  |  |  |  |  |  |
Terminalling and storage | $ | 17,785 |  |  | $ | 18,542 |  |  | $ | 54,412 |  |  | $ | 54,121 |
Transportation | 7,975 |  |  | 7,426 |  |  | 24,894 |  |  | 20,214 |
Product Sales | 91 |  |  | 122 |  |  | 343 |  |  | 8,544 |
Costs and expenses:* |  |  |  |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |  |  |
Specialty products | 8,401 |  |  | 9,896 |  |  | 23,342 |  |  | 27,324 |
Sulfur services | 3,014 |  |  | 2,787 |  |  | 8,926 |  |  | 8,139 |
Terminalling and storage | 23 |  |  | 23 |  |  | 65 |  |  | 54 |
Expenses: |  |  |  |  |  |  |
Operating expenses | 26,153 |  |  | 25,606 |  |  | 79,077 |  |  | 74,491 |
Selling, general and administrative | 12,215 |  |  | 8,477 |  |  | 27,716 |  |  | 23,549 |

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