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Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Segment margin | $ 173,564 | $ 170,240
Total revenues | 620,009 | 725,808
Offshore Pipeline Transportation |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 78,317 | 73,260
Sodium Minerals & Sulfur Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 275,486 | 285,910
Onshore Facilities & Transportation |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 209,556 | 317,709
Marine Transportation |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 56,650 | 48,929
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Segment margin | 173,564 | 170,240
Capital Expenditures | 33,167 | 44,507
Total revenues | 620,009 | 725,808
Operating Segments | Offshore Pipeline Transportation |  |
Segment Reporting Information [Line Items] |  |
Segment margin | 76,390 | 73,173
Capital Expenditures | 458 | 654
Total revenues | 78,317 | 73,260
Operating Segments | Sodium Minerals & Sulfur Services |  |
Segment Reporting Information [Line Items] |  |
Segment margin | 58,639 | 64,391
Capital Expenditures | 22,706 | 9,699
Total revenues | 277,349 | 287,403
Operating Segments | Onshore Facilities & Transportation |  |
Segment Reporting Information [Line Items] |  |
Segment margin | 25,603 | 21,689
Capital Expenditures | 775 | 23,289
Total revenues | 211,025 | 320,215
Operating Segments | Marine Transportation |  |
Segment Reporting Information [Line Items] |  |
Segment margin | 12,932 | 10,987
Capital Expenditures | 9,228 | 10,865
Total revenues | 53,318 | 44,930
Intersegment |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment | Offshore Pipeline Transportation |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment | Sodium Minerals & Sulfur Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (1,863) | (1,493)
Intersegment | Onshore Facilities & Transportation |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (1,469) | (2,506)
Intersegment | Marine Transportation |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 3,332 | $ 3,999

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- 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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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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