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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 |

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