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Business Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Segment margin $ 139,325 $ 184,112 $ 308,613 $ 357,676
Total revenues 388,467 634,785 928,390 1,254,794
Offshore Pipeline Transportation        
Segment Reporting Information [Line Items]        
Total revenues 64,964 78,427 143,393 156,744
Sodium Minerals & Sulfur Services        
Segment Reporting Information [Line Items]        
Total revenues 192,624 274,606 436,014 550,092
Onshore Facilities and Transportation        
Segment Reporting Information [Line Items]        
Total revenues 74,159 223,046 229,917 432,602
Marine Transportation        
Segment Reporting Information [Line Items]        
Total revenues 56,720 58,706 119,066 115,356
Operating Segments        
Segment Reporting Information [Line Items]        
Segment margin 139,325 184,112 308,613 357,676
Capital expenditures 39,767 39,363 71,158 72,530
Total revenues 388,467 634,785 928,390 1,254,794
Operating Segments | Offshore Pipeline Transportation        
Segment Reporting Information [Line Items]        
Segment margin 75,148 76,528 160,394 152,918
Capital expenditures 1,983 2,521 3,010 2,979
Total revenues 64,964 78,427 143,393 156,744
Operating Segments | Sodium Minerals & Sulfur Services        
Segment Reporting Information [Line Items]        
Segment margin 24,824 57,705 61,765 116,344
Capital expenditures 33,462 26,137 48,437 48,843
Total revenues 194,543 276,513 440,078 553,862
Operating Segments | Onshore Facilities and Transportation        
Segment Reporting Information [Line Items]        
Segment margin 21,215 35,920 49,314 61,523
Capital expenditures 829 3,009 1,986 3,784
Total revenues 74,690 223,778 231,489 434,803
Operating Segments | Marine Transportation        
Segment Reporting Information [Line Items]        
Segment margin 18,138 13,959 37,140 26,891
Capital expenditures 3,493 7,696 17,725 16,924
Total revenues 54,270 56,067 113,430 109,385
Intersegment        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment | Offshore Pipeline Transportation        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment | Sodium Minerals & Sulfur Services        
Segment Reporting Information [Line Items]        
Total revenues (1,919) (1,907) (4,064) (3,770)
Intersegment | Onshore Facilities and Transportation        
Segment Reporting Information [Line Items]        
Total revenues (531) (732) (1,572) (2,201)
Intersegment | Marine Transportation        
Segment Reporting Information [Line Items]        
Total revenues $ 2,450 $ 2,639 $ 5,636 $ 5,971