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Business Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Segment margin $ 219,272 $ 152,136 $ 376,724 $ 308,233
Total revenues 721,725 503,855 1,353,672 1,025,074
Offshore Pipeline Transportation [Member]        
Segment Reporting Information [Line Items]        
Total revenues 82,085 73,221 150,153 137,605
Sodium Minerals and Sulfur Services [Member]        
Segment Reporting Information [Line Items]        
Total revenues 318,608 237,087 604,282 464,374
Onshore Facilities and Transportation [Member]        
Segment Reporting Information [Line Items]        
Total revenues 244,712 145,921 467,143 335,138
Marine Transportation [Member]        
Segment Reporting Information [Line Items]        
Total revenues 76,320 47,626 132,094 87,957
Operating Segments        
Segment Reporting Information [Line Items]        
Segment margin 219,272 152,136 376,724 308,233
Capital expenditures 89,139 113,625 161,702 148,004
Total revenues 721,725 503,855 1,353,672 1,025,074
Operating Segments | Offshore Pipeline Transportation [Member]        
Segment Reporting Information [Line Items]        
Segment margin 118,980 83,106 189,884 167,375
Capital expenditures 44,369 19,421 79,810 30,949
Total revenues 82,085 73,221 150,153 137,605
Operating Segments | Sodium Minerals and Sulfur Services [Member]        
Segment Reporting Information [Line Items]        
Segment margin 71,701 38,194 139,076 81,914
Capital expenditures 38,920 80,560 65,246 90,598
Total revenues 321,192 239,258 609,200 468,564
Operating Segments | Onshore Facilities and Transportation [Member]        
Segment Reporting Information [Line Items]        
Segment margin 11,018 22,368 18,054 43,367
Capital expenditures 1,780 2,487 2,517 3,586
Total revenues 242,131 144,406 462,426 332,556
Operating Segments | Marine Transportation [Member]        
Segment Reporting Information [Line Items]        
Segment margin 17,573 8,468 29,710 15,577
Capital expenditures 4,070 11,157 14,129 22,871
Total revenues 76,317 46,970 131,893 86,349
Intersegment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment | Offshore Pipeline Transportation [Member]        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment | Sodium Minerals and Sulfur Services [Member]        
Segment Reporting Information [Line Items]        
Total revenues (2,584) (2,171) (4,918) (4,190)
Intersegment | Onshore Facilities and Transportation [Member]        
Segment Reporting Information [Line Items]        
Total revenues 2,581 1,515 4,717 2,582
Intersegment | Marine Transportation [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 3 $ 656 $ 201 $ 1,608