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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | $ 173,854 | $ 134,000 | $ 344,094 | $ 272,645
Total revenues | 752,388 | 406,723 | 1,478,196 | 822,214
Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 69,969 | 77,638 | 143,229 | 162,766
Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 298,881 | 43,068 | 584,791 | 88,114
Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 327,353 | 232,815 | 645,062 | 467,830
Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 56,185 | 53,202 | 105,114 | 103,504
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 173,854 | 134,000 | 344,094 | 272,645
Capital Expenditures | 42,391 | 57,850 | 86,898 | 116,837
External customers | 752,388 | 406,723 | 1,478,196 | 822,214
Operating Segments | Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 71,602 | 78,211 | 144,775 | 165,300
Capital Expenditures | 1,447 | 3,903 | 2,101 | 6,142
External customers | 69,969 | 78,577 | 143,229 | 163,982
Operating Segments | Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 64,542 | 16,337 | 128,933 | 33,833
Capital Expenditures | 18,560 | 432 | 28,259 | 945
External customers | 300,928 | 45,210 | 588,331 | 92,481
Operating Segments | Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 25,744 | 25,296 | 47,433 | 46,393
Capital Expenditures | 12,570 | 42,383 | 35,859 | 89,085
External customers | 328,134 | 233,625 | 648,349 | 468,236
Operating Segments | Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 11,966 | 14,156 | 22,953 | 27,119
Capital Expenditures | 9,814 | 11,132 | 20,679 | 20,665
External customers | 53,357 | 49,311 | 98,287 | 97,515
Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | 0 | 0 | 0 | 0
Intersegment | Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | 0 | (939) | 0 | (1,216)
Intersegment | Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | (2,047) | (2,142) | (3,540) | (4,367)
Intersegment | Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | (781) | (810) | (3,287) | (406)
Intersegment | Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | $ 2,828 | $ 3,891 | $ 6,827 | $ 5,989

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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