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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | $ 414,001,000 | $ 397,291,000 | $ 1,189,660,000 | $ 1,261,917,000 |
Other Assets |  | 7,049,000 |  | 7,049,000 |  | $ 5,174,000
Accrued Liabilities |  | 30,023,000 |  | 30,023,000 |  | 41,618,000
Other Long-Term Liabilities |  | 70,161,000 |  | 70,161,000 |  | $ 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 |  | 241,123,000 | 194,978,000 | 665,859,000 | 590,923,000 |
Product sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 157,480,000 | 185,267,000 | 469,628,000 | 610,635,000 |
Sulfur services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 15,398,000 | 17,046,000 | 54,173,000 | 60,359,000 |
Offshore pipeline transportation |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 143,306,000 | 101,119,000 | 377,563,000 | 302,133,000 |
Offshore pipeline transportation | Fee-based revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 143,306,000 | 101,119,000 | 377,563,000 | 302,133,000 |
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 |  | 77,058,000 | 78,496,000 | 237,319,000 | 243,941,000 |
Marine transportation | Fee-based revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 77,058,000 | 78,496,000 | 237,319,000 | 243,941,000 |
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 |  | 193,637,000 | 217,676,000 | 574,778,000 | 715,843,000 |
Onshore transportation and services | Fee-based revenues |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 20,759,000 | 15,363,000 | 50,977,000 | 44,849,000 |
Onshore transportation and services | Product sales |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | 157,480,000 | 185,267,000 | 469,628,000 | 610,635,000 |
Onshore transportation and services | Sulfur services |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total revenues |  | $ 15,398,000 | $ 17,046,000 | $ 54,173,000 | $ 60,359,000 |

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