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Business Segment Information (Schedule of Total Assets by Reportable Segment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]    
Total consolidated assets $ 6,019,199 $ 5,905,801
Operating Segments | Offshore pipeline transportation    
Segment Reporting Information [Line Items]    
Total consolidated assets 2,101,728 2,103,140
Operating Segments | Sodium Minerals and Sulfur Services [Member]    
Segment Reporting Information [Line Items]    
Total consolidated assets 2,149,589 2,132,588
Operating Segments | Onshore Facilities and Transportation [Member]    
Segment Reporting Information [Line Items]    
Total consolidated assets 1,014,005 923,064
Operating Segments | Marine transportation    
Segment Reporting Information [Line Items]    
Total consolidated assets 698,209 703,030
Other assets    
Segment Reporting Information [Line Items]    
Total consolidated assets $ 55,668 $ 43,979