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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 184,531 | $ 195,636 | $ 365,361 | $ 440,165
Throughput and storage |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 22,375 | 21,684 | 44,892 | 42,542
Sulfur services |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 3,477 | 3,357 | 6,954 | 6,715
Terminalling and storage segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 22,375 | 21,684 | 44,892 | 42,542
Terminalling and storage segment | Throughput and storage |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 22,375 | 21,684 | 44,892 | 42,542
Transportation segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 57,676 | 54,750 | 115,983 | 110,473
Transportation segment | Land transportation |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 42,860 | 40,869 | 85,603 | 83,099
Transportation segment | Inland marine transportation |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 12,977 | 12,357 | 27,300 | 24,435
Transportation segment | Offshore marine transportation |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,839 | 1,524 | 3,080 | 2,939
Sulfur services segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 37,192 | 40,330 | 70,873 | 76,009
Sulfur services segment | Sulfur product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 7,521 | 7,462 | 13,204 | 13,738
Sulfur services segment | Fertilizer product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 26,194 | 29,511 | 50,715 | 55,556
Sulfur services segment | Sulfur services |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 3,477 | 3,357 | 6,954 | 6,715
Specialty products segment |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 67,288 | 78,872 | 133,613 | 211,141
Specialty products segment | Natural gas liquids product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 35,435 | 45,678 | 73,566 | 143,900
Specialty products segment | Lubricant product sales |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 31,853 | $ 33,194 | $ 60,047 | $ 67,241
[1] | Related Party Transactions Included Above
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Revenues:* |  |  |  |  |  |  |
Terminalling and storage | $ | 18,078 |  |  | $ | 18,077 |  |  | $ | 36,627 |  |  | $ | 35,579 |
Transportation | 8,318 |  |  | 7,277 |  |  | 16,919 |  |  | 12,788 |
Product Sales | 123 |  |  | 7,497 |  |  | 252 |  |  | 8,422 |
Costs and expenses:* |  |  |  |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |  |  |
Specialty products | 8,368 |  |  | 7,918 |  |  | 14,941 |  |  | 17,428 |
Sulfur services | 2,919 |  |  | 2,644 |  |  | 5,912 |  |  | 5,352 |
Terminalling and storage | 24 |  |  | 25 |  |  | 42 |  |  | 31 |
Expenses: |  |  |  |  |  |  |
Operating expenses | 26,501 |  |  | 25,058 |  |  | 52,924 |  |  | 48,885 |
Selling, general and administrative | 8,638 |  |  | 6,556 |  |  | 15,501 |  |  | 15,072 |

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