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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | $ 153,862 | $ 161,857 | $ 462,095 | $ 470,470
Total revenues | 518,821 | 443,125 | 1,543,895 | 1,371,515
Offshore Pipeline Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 69,479 | 53,893 | 207,084 | 197,286
Sodium Minerals & Sulfur Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 237,651 | 206,731 | 702,025 | 642,745
Onshore Facilities and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 162,975 | 130,589 | 498,113 | 360,506
Marine Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 48,716 | 51,912 | 136,673 | 170,978
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 153,862 | 161,857 | 462,095 | 470,470
Capital expenditures | 79,217 | 28,843 | 227,221 | 100,001
Total revenues | 518,821 | 443,125 | 1,543,895 | 1,371,515
Operating Segments | Offshore Pipeline Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 76,045 | 57,380 | 243,420 | 217,774
Capital expenditures | 3,819 | 2,899 | 34,768 | 5,909
Total revenues | 69,479 | 53,870 | 207,084 | 197,263
Operating Segments | Sodium Minerals & Sulfur Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 39,649 | 27,592 | 121,563 | 89,357
Capital expenditures | 67,583 | 19,225 | 158,181 | 67,662
Total revenues | 240,048 | 208,909 | 708,612 | 648,987
Operating Segments | Onshore Facilities and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 29,145 | 61,298 | 72,512 | 110,612
Capital expenditures | 929 | 1,446 | 4,515 | 3,432
Total revenues | 161,296 | 130,440 | 493,852 | 361,929
Operating Segments | Marine Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 9,023 | 15,587 | 24,600 | 52,727
Capital expenditures | 6,886 | 5,273 | 29,757 | 22,998
Total revenues | 47,998 | 49,906 | 134,347 | 163,336
Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Intersegment | Offshore Pipeline Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 23 | 0 | 23
Intersegment | Sodium Minerals & Sulfur Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (2,397) | (2,178) | (6,587) | (6,242)
Intersegment | Onshore Facilities and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,679 | 149 | 4,261 | (1,423)
Intersegment | Marine Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 718 | $ 2,006 | $ 2,326 | $ 7,642

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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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