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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total consolidated assets | $ 6,560,681 | $ 6,479,071
Other assets |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 55,478 | 43,060
Offshore pipeline transportation | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 2,307,072 | 2,359,013
Sodium Minerals & Sulfur Services | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 1,991,392 | 1,844,845
Onshore Facilities & Transportation | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | 1,435,504 | 1,431,910
Marine transportation | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total consolidated assets | $ 771,235 | $ 800,243

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