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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | $ 146,514 | $ 141,340 | $ 419,159 | $ 428,707
Total revenues | 486,114 | 460,050 | 1,308,328 | 1,284,440
Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 80,671 | 89,717 | 243,437 | 244,837
Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 109,765 | 45,725 | 197,879 | 129,585
Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 48,534 | 55,285 | 152,038 | 159,930
Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 247,144 | 269,323 | 714,974 | 750,088
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 146,514 | 141,340 | 419,159 | 428,707
Capital Expenditures | 1,383,712 | 116,750 | 1,500,549 | 358,429
External customers | 486,114 | 460,050 | 1,308,328 | 1,284,440
Operating Segments | Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 78,228 | 86,557 | 243,528 | 249,457
Capital Expenditures | 2,356 | 3,977 | 8,498 | 35,175
External customers | 80,671 | 89,717 | 244,653 | 242,672
Operating Segments | Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 30,031 | 20,526 | 63,864 | 61,586
Capital Expenditures | 1,330,947 | 488 | 1,331,892 | 1,645
External customers | 111,756 | 48,069 | 204,237 | 136,437
Operating Segments | Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 12,649 | 16,697 | 39,768 | 53,695
Capital Expenditures | 23,831 | 26,937 | 44,496 | 62,928
External customers | 46,084 | 53,573 | 143,599 | 155,197
Operating Segments | Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment margin | 25,606 | 17,560 | 71,999 | 63,969
Capital Expenditures | 26,578 | 85,348 | 115,663 | 258,681
External customers | 247,603 | 268,691 | 715,839 | 750,134
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | 0 | 0 | 0 | 0
Intersegment Eliminations | Offshore pipeline transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | 0 | 0 | (1,216) | 2,165
Intersegment Eliminations | Sodium minerals and sulfur services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | (1,991) | (2,344) | (6,358) | (6,852)
Intersegment Eliminations | Marine transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | 2,450 | 1,712 | 8,439 | 4,733
Intersegment Eliminations | Onshore Facilities & Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment | $ (459) | $ 632 | $ (865) | $ (46)

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 Amount of revenue from external customers for the reportable segment. + 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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