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Business Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Segment margin $ 146,514 $ 141,340 $ 419,159 $ 428,707
Total revenues 486,114 460,050 1,308,328 1,284,440
Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Total revenues 80,671 89,717 243,437 244,837
Sodium minerals and sulfur services        
Segment Reporting Information [Line Items]        
Total revenues 109,765 45,725 197,879 129,585
Marine transportation        
Segment Reporting Information [Line Items]        
Total revenues 48,534 55,285 152,038 159,930
Onshore Facilities & Transportation        
Segment Reporting Information [Line Items]        
Total revenues 247,144 269,323 714,974 750,088
Operating Segments        
Segment Reporting Information [Line Items]        
Segment margin 146,514 141,340 419,159 428,707
Capital Expenditures 1,383,712 116,750 1,500,549 358,429
External customers 486,114 460,050 1,308,328 1,284,440
Operating Segments | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Segment margin 78,228 86,557 243,528 249,457
Capital Expenditures 2,356 3,977 8,498 35,175
External customers 80,671 89,717 244,653 242,672
Operating Segments | Sodium minerals and sulfur services        
Segment Reporting Information [Line Items]        
Segment margin 30,031 20,526 63,864 61,586
Capital Expenditures 1,330,947 488 1,331,892 1,645
External customers 111,756 48,069 204,237 136,437
Operating Segments | Marine transportation        
Segment Reporting Information [Line Items]        
Segment margin 12,649 16,697 39,768 53,695
Capital Expenditures 23,831 26,937 44,496 62,928
External customers 46,084 53,573 143,599 155,197
Operating Segments | Onshore Facilities & Transportation        
Segment Reporting Information [Line Items]        
Segment margin 25,606 17,560 71,999 63,969
Capital Expenditures 26,578 85,348 115,663 258,681
External customers 247,603 268,691 715,839 750,134
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Intersegment 0 0 0 0
Intersegment Eliminations | Offshore pipeline transportation        
Segment Reporting Information [Line Items]        
Intersegment 0 0 (1,216) 2,165
Intersegment Eliminations | Sodium minerals and sulfur services        
Segment Reporting Information [Line Items]        
Intersegment (1,991) (2,344) (6,358) (6,852)
Intersegment Eliminations | Marine transportation        
Segment Reporting Information [Line Items]        
Intersegment 2,450 1,712 8,439 4,733
Intersegment Eliminations | Onshore Facilities & Transportation        
Segment Reporting Information [Line Items]        
Intersegment $ (459) $ 632 $ (865) $ (46)