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Business Segment Information (Schedule of Revenues by Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | $ 607,473 | $ 713,262 | $ 712,758
Total revenues | 1,824,655 | 2,480,820 | 2,912,770
Offshore pipeline transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 237,146 | 318,116 | 284,544
Sodium minerals and sulfur services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 877,769 | 1,105,987 | 1,174,434
Onshore facilities and transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 499,482 | 821,072 | 1,233,855
Marine transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 210,258 | 235,645 | 219,937
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 607,473 | 713,262 | 712,758
Capital Expenditures | 144,324 | 173,042 | 161,393
Total revenues | 1,824,655 | 2,480,820 | 2,912,770
Operating Segments | Offshore pipeline transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 270,078 | 320,023 | 285,014
Capital Expenditures | 13,323 | 17,809 | 4,703
Total revenues | 237,123 | 318,116 | 284,544
Operating Segments | Sodium minerals and sulfur services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 130,083 | 223,908 | 260,488
Capital Expenditures | 95,511 | 107,837 | 74,712
Total revenues | 886,078 | 1,113,623 | 1,181,578
Operating Segments | Onshore facilities and transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 147,254 | 111,412 | 119,918
Capital Expenditures | 4,133 | 6,576 | 51,110
Total revenues | 500,420 | 824,148 | 1,240,382
Operating Segments | Marine transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Segment Margin | 60,058 | 57,919 | 47,338
Capital Expenditures | 31,357 | 40,820 | 30,868
Total revenues | 201,034 | 224,933 | 206,266
Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Intersegment | Offshore pipeline transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 23 | 0 | 0
Intersegment | Sodium minerals and sulfur services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (8,309) | (7,636) | (7,144)
Intersegment | Onshore facilities and transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (938) | (3,076) | (6,527)
Intersegment | Marine transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 9,224 | $ 10,712 | $ 13,671

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- Definition Revenues less product costs, operating expenses (excluding non-cash charges such as depreciation and amortization), and segment general and administrative expenses, plus our equity in distributable cash generated by our equity investees. Also excludes the non-cash effects of our stock appreciation rights compensation plan and includes the non-income portion of payments received under direct financing leases. + References No definition available. + Details
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