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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | $ 183,207 | $ 146,514 | $ 527,301 | $ 419,159
Total revenues | 745,278 | 486,114 | 2,223,474 | 1,308,328
Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 70,115 | 80,671 | 213,344 | 243,437
Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 291,722 | 109,765 | 876,513 | 197,879
Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 327,145 | 247,144 | 972,207 | 714,974
Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 56,296 | 48,534 | 161,410 | 152,038
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 183,207 | 146,514 | 527,301 | 419,159
Capital Expenditures | 43,019 | 1,383,712 | 129,917 | 1,500,549
External customers | 745,278 | 486,114 | 2,223,474 | 1,308,328
Operating Segments | Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 70,963 | 78,228 | 215,738 | 243,528
Capital Expenditures | 564 | 2,356 | 2,665 | 8,498
External customers | 70,115 | 80,671 | 213,344 | 244,653
Operating Segments | Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 63,942 | 30,031 | 192,875 | 63,864
Capital Expenditures | 20,819 | 1,330,947 | 49,078 | 1,331,892
External customers | 293,491 | 111,756 | 881,822 | 204,237
Operating Segments | Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 36,189 | 25,606 | 83,622 | 71,999
Capital Expenditures | 16,700 | 26,578 | 52,559 | 115,663
External customers | 327,844 | 247,603 | 976,193 | 715,839
Operating Segments | Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 12,113 | 12,649 | 35,066 | 39,768
Capital Expenditures | 4,936 | 23,831 | 25,615 | 44,496
External customers | 53,828 | 46,084 | 152,115 | 143,599
Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | 0 | 0 | 0 | 0
Intersegment | Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | 0 | 0 | 0 | (1,216)
Intersegment | Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | (1,769) | (1,991) | (5,309) | (6,358)
Intersegment | Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | (699) | (459) | (3,986) | (865)
Intersegment | Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | $ 2,468 | $ 2,450 | $ 9,295 | $ 8,439

X
- Definition Capital expenditures include both maintenance and growth capital expenditures, such as fixed asset additions (including enhancements to existing facilities and construction of internal growth projects) as well as acquisitions of businesses and interests in equity investees. + References No definition available. + Details
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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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