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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total consolidated assets	$ 6,614,811	$ 6,479,071
Other assets
Segment Reporting Information [Line Items]
Total consolidated assets	50,221	43,060
Offshore pipeline transportation | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	2,355,360	2,359,013
Sodium Minerals & Sulfur Services | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	1,951,478	1,844,845
Onshore Facilities & Transportation | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	1,469,582	1,431,910
Marine transportation | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	$ 788,170	$ 800,243

X

- 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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-SubTopic 210
-Section S99
-Paragraph 1
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+ References

No definition available.

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