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Business Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Segment margin $ 157,452 $ 156,097
Total revenues 631,947 521,219
Offshore Pipeline Transportation [Member]    
Segment Reporting Information [Line Items]    
Total revenues 68,068 64,384
Sodium Minerals and Sulfur Services [Member]    
Segment Reporting Information [Line Items]    
Total revenues 285,674 227,287
Onshore Facilities and Transportation [Member]    
Segment Reporting Information [Line Items]    
Total revenues 222,431 189,217
Marine Transportation [Member]    
Segment Reporting Information [Line Items]    
Total revenues 55,774 40,331
Operating Segments    
Segment Reporting Information [Line Items]    
Segment margin 157,452 156,097
Capital expenditures 72,563 34,379
Total revenues 631,947 521,219
Operating Segments | Offshore Pipeline Transportation [Member]    
Segment Reporting Information [Line Items]    
Segment margin 70,904 84,269
Capital expenditures 35,441 11,528
Total revenues 68,068 64,384
Operating Segments | Sodium Minerals and Sulfur Services [Member]    
Segment Reporting Information [Line Items]    
Segment margin 67,375 43,720
Capital expenditures 26,326 10,038
Total revenues 288,008 229,306
Operating Segments | Onshore Facilities and Transportation [Member]    
Segment Reporting Information [Line Items]    
Segment margin 7,036 20,999
Capital expenditures 737 1,099
Total revenues 220,295 188,150
Operating Segments | Marine Transportation [Member]    
Segment Reporting Information [Line Items]    
Segment margin 12,137 7,109
Capital expenditures 10,059 11,714
Total revenues 55,576 39,379
Intersegment    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment | Offshore Pipeline Transportation [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment | Sodium Minerals and Sulfur Services [Member]    
Segment Reporting Information [Line Items]    
Total revenues (2,334) (2,019)
Intersegment | Onshore Facilities and Transportation [Member]    
Segment Reporting Information [Line Items]    
Total revenues 2,136 1,067
Intersegment | Marine Transportation [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 198 $ 952