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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total consolidated assets	$ 5,953,350	$ 6,597,641
Operating Segments | Offshore pipeline transportation
Segment Reporting Information [Line Items]
Total consolidated assets	2,202,649	2,306,946
Operating Segments | Sodium Minerals & Sulfur Services
Segment Reporting Information [Line Items]
Total consolidated assets	1,959,863	2,019,905
Operating Segments | Onshore Facilities and Transportation
Segment Reporting Information [Line Items]
Total consolidated assets	1,027,353	1,457,190
Operating Segments | Marine transportation
Segment Reporting Information [Line Items]
Total consolidated assets	724,929	772,383
Other assets
Segment Reporting Information [Line Items]
Total consolidated assets	$ 38,556	$ 41,217

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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