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Business Segment Information (Schedule of Revenues by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Total Segment Margin                 $ 713,262 $ 712,758 $ 594,543
Total revenues $ 604,329 $ 621,697 $ 634,785 $ 620,009 $ 689,296 $ 745,278 $ 752,388 $ 725,808 2,480,820 2,912,770 2,028,377
Offshore pipeline transportation                      
Segment Reporting Information [Line Items]                      
Total revenues                 318,116 284,544 318,239
Sodium minerals and sulfur services                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,105,987 1,174,434 462,622
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                 821,072 1,233,855 1,042,229
Marine transportation                      
Segment Reporting Information [Line Items]                      
Total revenues                 235,645 219,937 205,287
Operating Segments                      
Segment Reporting Information [Line Items]                      
Total Segment Margin                 713,262 712,758 594,543
Capital Expenditures                 173,042 161,393 1,580,821
Total revenues                 2,480,820 2,912,770 2,028,377
Operating Segments | Offshore pipeline transportation                      
Segment Reporting Information [Line Items]                      
Total Segment Margin                 320,023 285,014 317,540
Capital Expenditures                 17,809 4,703 8,815
Total revenues                 318,116 284,544 319,455
Operating Segments | Sodium minerals and sulfur services                      
Segment Reporting Information [Line Items]                      
Total Segment Margin                 223,908 260,488 130,333
Capital Expenditures                 107,837 74,712 1,354,469
Total revenues                 1,113,623 1,181,578 470,789
Operating Segments | Onshore facilities and transportation                      
Segment Reporting Information [Line Items]                      
Total Segment Margin                 111,412 119,918 96,376
Capital Expenditures                 6,576 51,110 149,123
Total revenues                 824,148 1,240,382 1,044,083
Operating Segments | Marine transportation                      
Segment Reporting Information [Line Items]                      
Total Segment Margin                 57,919 47,338 50,294
Capital Expenditures                 40,820 30,868 68,414
Total revenues                 224,933 206,266 194,050
Intersegment                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment | Offshore pipeline transportation                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 (1,216)
Intersegment | Sodium minerals and sulfur services                      
Segment Reporting Information [Line Items]                      
Total revenues                 (7,636) (7,144) (8,167)
Intersegment | Onshore facilities and transportation                      
Segment Reporting Information [Line Items]                      
Total revenues                 (3,076) (6,527) (1,854)
Intersegment | Marine transportation                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ 10,712 $ 13,671 $ 11,237