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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | $ 6,479,071 | $ 7,137,481 | $ 5,702,592
Other assets |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 43,060 | 49,737 | 43,089
Offshore pipeline transportation services |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 2,359,013 | 2,486,803 | 2,575,335
Sodium minerals and sulfur services |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 1,844,845 | 1,848,188 | 395,043
Onshore facilities and transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 1,431,910 | 1,927,976 | 1,875,403
Marine transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | $ 800,243 | $ 824,777 | $ 813,722

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