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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | $ 5,933,619 | $ 6,597,641 | $ 6,479,071
Operating Segments | Offshore pipeline transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 2,187,083 | 2,306,946 | 2,359,013
Operating Segments | Sodium minerals and sulfur services |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 1,962,146 | 2,019,905 | 1,844,845
Operating Segments | Onshore facilities and transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 1,035,662 | 1,457,190 | 1,431,910
Operating Segments | Marine transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | 711,058 | 772,383 | 800,243
Other assets |  |  |
Segment Reporting Information [Line Items] |  |  |
TOTAL ASSETS | $ 37,670 | $ 41,217 | $ 43,060

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