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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | $ 152,136 | $ 139,325 | $ 308,233 | $ 308,613
Total revenues | 503,855 | 388,467 | 1,025,074 | 928,390
Offshore Pipeline Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 73,221 | 64,964 | 137,605 | 143,393
Sodium Minerals & Sulfur Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 237,087 | 192,624 | 464,374 | 436,014
Onshore Facilities and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 145,921 | 74,159 | 335,138 | 229,917
Marine Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 47,626 | 56,720 | 87,957 | 119,066
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 152,136 | 139,325 | 308,233 | 308,613
Capital expenditures | 113,625 | 39,767 | 148,004 | 71,158
Total revenues | 503,855 | 388,467 | 1,025,074 | 928,390
Operating Segments | Offshore Pipeline Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 83,106 | 75,148 | 167,375 | 160,394
Capital expenditures | 19,421 | 1,983 | 30,949 | 3,010
Total revenues | 73,221 | 64,964 | 137,605 | 143,393
Operating Segments | Sodium Minerals & Sulfur Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 38,194 | 24,824 | 81,914 | 61,765
Capital expenditures | 80,560 | 33,462 | 90,598 | 48,437
Total revenues | 239,258 | 194,543 | 468,564 | 440,078
Operating Segments | Onshore Facilities and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 22,368 | 21,215 | 43,367 | 49,314
Capital expenditures | 2,487 | 829 | 3,586 | 1,986
Total revenues | 144,406 | 74,690 | 332,556 | 231,489
Operating Segments | Marine Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 8,468 | 18,138 | 15,577 | 37,140
Capital expenditures | 11,157 | 3,493 | 22,871 | 17,725
Total revenues | 46,970 | 54,270 | 86,349 | 113,430
Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Intersegment | Offshore Pipeline Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Intersegment | Sodium Minerals & Sulfur Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (2,171) | (1,919) | (4,190) | (4,064)
Intersegment | Onshore Facilities and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,515 | (531) | 2,582 | (1,572)
Intersegment | Marine Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 656 | $ 2,450 | $ 1,608 | $ 5,636

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- Definition Revenues less product costs, operating expenses (excluding non-cash charges such as depreciation and amortization), and segment general and administrative expenses, plus our equity in distributable cash generated by our equity investees. Also excludes the non-cash effects of our stock appreciation rights compensation plan and includes the non-income portion of payments received under direct financing leases. + References No definition available. + Details
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