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Business Segment Information (Schedule of Revenues by Segment) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 24, 2015
Segment Reporting [Abstract]                        
Number of operating segments | segment                 4      
Segment Reporting Information [Line Items]                        
Total Segment Margin                 $ 712,758 $ 594,543 $ 569,571  
Total revenues $ 689,296 $ 745,278 $ 752,388 $ 725,808 $ 720,049 $ 486,114 $ 406,723 $ 415,491 2,912,770 2,028,377 1,712,493  
Enterprise Offshore Acquisition | Deepwater Gateway LLC                        
Segment Reporting Information [Line Items]                        
Equity investment, ownership percentage                       50.00%
Offshore pipeline transportation services                        
Segment Reporting Information [Line Items]                        
Total revenues                 284,544 318,239 334,679  
Offshore pipeline transportation services | Deepwater Gateway LLC                        
Segment Reporting Information [Line Items]                        
Capital Expenditures                     35,100  
Sodium minerals and sulfur services                        
Segment Reporting Information [Line Items]                        
Total revenues                 1,174,434 462,622 171,503  
Sodium minerals and sulfur services | Alkali Business                        
Segment Reporting Information [Line Items]                        
Capital Expenditures                   1,300,000    
Onshore facilities and transportation                        
Segment Reporting Information [Line Items]                        
Total revenues                 1,233,855 1,042,229 993,290  
Marine transportation                        
Segment Reporting Information [Line Items]                        
Total revenues                 219,937 205,287 213,021  
Operating Segments                        
Segment Reporting Information [Line Items]                        
Total Segment Margin                 712,758 594,543 569,571  
Capital Expenditures                 161,393 1,580,821 443,993  
External customers                 2,912,770 2,028,377 1,712,493  
Operating Segments | Offshore pipeline transportation services                        
Segment Reporting Information [Line Items]                        
Total Segment Margin                 285,014 317,540 336,620  
Capital Expenditures                 4,703 8,815 46,277  
External customers                 284,544 319,455 332,514  
Operating Segments | Sodium minerals and sulfur services                        
Segment Reporting Information [Line Items]                        
Total Segment Margin                 260,488 130,333 79,508  
Capital Expenditures                 74,712 1,354,469 2,274  
External customers                 1,181,578 470,789 180,665  
Operating Segments | Onshore facilities and transportation                        
Segment Reporting Information [Line Items]                        
Total Segment Margin                 119,918 96,376 83,364  
Capital Expenditures                 51,110 149,123 316,638  
External customers                 1,240,382 1,044,083 993,103  
Operating Segments | Marine transportation                        
Segment Reporting Information [Line Items]                        
Total Segment Margin                 47,338 50,294 70,079  
Capital Expenditures                 30,868 68,414 78,804  
External customers                 206,266 194,050 206,211  
Intersegment                        
Segment Reporting Information [Line Items]                        
Intersegment                 0 0 0  
Intersegment | Offshore pipeline transportation services                        
Segment Reporting Information [Line Items]                        
Intersegment                 0 (1,216) 2,165  
Intersegment | Sodium minerals and sulfur services                        
Segment Reporting Information [Line Items]                        
Intersegment                 (7,144) (8,167) (9,162)  
Intersegment | Onshore facilities and transportation                        
Segment Reporting Information [Line Items]                        
Intersegment                 (6,527) (1,854) 187  
Intersegment | Marine transportation                        
Segment Reporting Information [Line Items]                        
Intersegment                 $ 13,671 $ 11,237 $ 6,810