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Business Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Segment margin $ 183,207 $ 146,514 $ 527,301 $ 419,159
Total revenues 745,278 486,114 2,223,474 1,308,328
Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Total revenues 70,115 80,671 213,344 243,437
Sodium minerals and sulfur services        
Segment Reporting Information [Line Items]        
Total revenues 291,722 109,765 876,513 197,879
Onshore Facilities & Transportation        
Segment Reporting Information [Line Items]        
Total revenues 327,145 247,144 972,207 714,974
Marine transportation        
Segment Reporting Information [Line Items]        
Total revenues 56,296 48,534 161,410 152,038
Operating Segments        
Segment Reporting Information [Line Items]        
Segment margin 183,207 146,514 527,301 419,159
Capital Expenditures 43,019 1,383,712 129,917 1,500,549
External customers 745,278 486,114 2,223,474 1,308,328
Operating Segments | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin 70,963 78,228 215,738 243,528
Capital Expenditures 564 2,356 2,665 8,498
External customers 70,115 80,671 213,344 244,653
Operating Segments | Sodium minerals and sulfur services        
Segment Reporting Information [Line Items]        
Segment margin 63,942 30,031 192,875 63,864
Capital Expenditures 20,819 1,330,947 49,078 1,331,892
External customers 293,491 111,756 881,822 204,237
Operating Segments | Onshore Facilities & Transportation        
Segment Reporting Information [Line Items]        
Segment margin 36,189 25,606 83,622 71,999
Capital Expenditures 16,700 26,578 52,559 115,663
External customers 327,844 247,603 976,193 715,839
Operating Segments | Marine transportation        
Segment Reporting Information [Line Items]        
Segment margin 12,113 12,649 35,066 39,768
Capital Expenditures 4,936 23,831 25,615 44,496
External customers 53,828 46,084 152,115 143,599
Intersegment        
Segment Reporting Information [Line Items]        
Intersegment 0 0 0 0
Intersegment | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Intersegment 0 0 0 (1,216)
Intersegment | Sodium minerals and sulfur services        
Segment Reporting Information [Line Items]        
Intersegment (1,769) (1,991) (5,309) (6,358)
Intersegment | Onshore Facilities & Transportation        
Segment Reporting Information [Line Items]        
Intersegment (699) (459) (3,986) (865)
Intersegment | Marine transportation        
Segment Reporting Information [Line Items]        
Intersegment $ 2,468 $ 2,450 $ 9,295 $ 8,439