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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 6,597,641	$ 6,479,071	$ 7,137,481
Operating Segments | Offshore pipeline transportation
Segment Reporting Information [Line Items]
TOTAL ASSETS	2,306,946	2,359,013	2,486,803
Operating Segments | Sodium minerals and sulfur services
Segment Reporting Information [Line Items]
TOTAL ASSETS	2,019,905	1,844,845	1,848,188
Operating Segments | Onshore facilities and transportation
Segment Reporting Information [Line Items]
TOTAL ASSETS	1,457,190	1,431,910	1,927,976
Operating Segments | Marine transportation
Segment Reporting Information [Line Items]
TOTAL ASSETS	772,383	800,243	824,777
Other assets
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 41,217	$ 43,060	$ 49,737

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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