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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | $ 377,348,000 | $ 430,179,000 | $ 775,659,000 | $ 864,626,000 |
Other Assets |  | 6,498,000 |  | 6,498,000 |  | $ 5,174,000
Accrued Liabilities |  | 33,400,000 |  | 33,400,000 |  | 41,618,000
Other Long-Term Liabilities |  | 73,350,000 |  | 73,350,000 |  | $ 82,164,000
Proceeds from disposal of discontinued operations, net of cash divested |  |  |  | 996,642,000 | 0 |
Alkali Business |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Proceeds from disposal of discontinued operations, net of cash divested | $ 1,000,000,000 |  |  |  |  |
Fee-based revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 221,700,000 | 197,094,000 | 424,736,000 | 395,945,000 |
Product sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 137,885,000 | 212,659,000 | 312,148,000 | 425,368,000 |
Sulfur services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 17,763,000 | 20,426,000 | 38,775,000 | 43,313,000 |
Offshore pipeline transportation |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 125,370,000 | 99,024,000 | 234,257,000 | 201,014,000 |
Offshore pipeline transportation | Fee-based revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 125,370,000 | 99,024,000 | 234,257,000 | 201,014,000 |
Offshore pipeline transportation | Product sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 0 | 0 | 0 | 0 |
Offshore pipeline transportation | Sulfur services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 0 | 0 | 0 | 0 |
Marine transportation |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 79,617,000 | 81,871,000 | 160,261,000 | 165,445,000 |
Marine transportation | Fee-based revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 79,617,000 | 81,871,000 | 160,261,000 | 165,445,000 |
Marine transportation | Product sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 0 | 0 | 0 | 0 |
Marine transportation | Sulfur services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 0 | 0 | 0 | 0 |
Onshore transportation and services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 172,361,000 | 249,284,000 | 381,141,000 | 498,167,000 |
Onshore transportation and services | Fee-based revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 16,713,000 | 16,199,000 | 30,218,000 | 29,486,000 |
Onshore transportation and services | Product sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 137,885,000 | 212,659,000 | 312,148,000 | 425,368,000 |
Onshore transportation and services | Sulfur services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | $ 17,763,000 | $ 20,426,000 | $ 38,775,000 | $ 43,313,000 |

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