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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total consolidated assets	$ 6,069,437	$ 6,597,641
Other assets
Segment Reporting Information [Line Items]
Total consolidated assets	39,953	41,217
Offshore pipeline transportation | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	2,230,159	2,306,946
Sodium Minerals & Sulfur Services | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	1,976,792	2,019,905
Onshore Facilities and Transportation | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	1,083,460	1,457,190
Marine transportation | Operating Segments
Segment Reporting Information [Line Items]
Total consolidated assets	$ 739,073	$ 772,383

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.

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