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Business Segment Information (Schedule of Revenues by Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | $ 827,062 | $ 770,055 | $ 617,729
Total revenues | 3,176,996 | 2,788,957 | 2,125,476
Offshore Pipeline Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 382,154 | 319,045 | 278,459
Soda and Sulfur Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,734,248 | 1,248,085 | 964,632
Marine Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 327,464 | 293,295 | 190,827
Onshore Facilities and Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 733,130 | 928,532 | 691,558
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 827,062 | 770,055 | 617,729
Capital Expenditures | 691,329 | 460,926 | 316,729
Total revenues | 3,176,996 | 2,788,957 | 2,125,476
Operating Segments | Offshore Pipeline Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 406,672 | 363,373 | 317,560
Capital Expenditures | 410,237 | 241,446 | 50,546
Total revenues | 377,842 | 319,045 | 278,459
Operating Segments | Soda and Sulfur Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 282,014 | 306,718 | 166,773
Capital Expenditures | 219,393 | 174,518 | 227,118
Total revenues | 1,743,327 | 1,258,236 | 973,354
Operating Segments | Marine Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 110,423 | 66,209 | 34,572
Capital Expenditures | 42,681 | 39,084 | 34,456
Total revenues | 327,464 | 292,925 | 188,011
Operating Segments | Onshore Facilities and Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 27,953 | 33,755 | 98,824
Capital Expenditures | 19,018 | 5,878 | 4,609
Total revenues | 728,363 | 918,751 | 685,652
Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Intersegment | Offshore Pipeline Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 4,312 | 0 | 0
Intersegment | Soda and Sulfur Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (9,079) | (10,151) | (8,722)
Intersegment | Marine Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 0 | 370 | 2,816
Intersegment | Onshore Facilities and Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 4,767 | $ 9,781 | $ 5,906

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