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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 518,821 | $ 443,125 | $ 1,543,895 | $ 1,371,515
Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 144,798 | 128,211 | 412,930 | 453,505
Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 347,369 | 296,384 | 1,057,149 | 851,242
Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,654 | 18,530 | 73,816 | 66,768
Offshore Pipeline Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 69,479 | 53,893 | 207,084 | 197,286
Offshore Pipeline Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 69,479 | 53,893 | 207,084 | 197,286
Offshore Pipeline Transportation | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Offshore Pipeline Transportation | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Sodium Minerals & Sulfur Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 237,651 | 206,731 | 702,025 | 642,745
Sodium Minerals & Sulfur Services | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Sodium Minerals & Sulfur Services | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 210,997 | 188,201 | 628,209 | 575,977
Sodium Minerals & Sulfur Services | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,654 | 18,530 | 73,816 | 66,768
Marine Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 48,716 | 51,912 | 136,673 | 170,978
Marine Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 48,716 | 51,912 | 136,673 | 170,978
Marine Transportation | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Marine Transportation | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Onshore Facilities and Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 162,975 | 130,589 | 498,113 | 360,506
Onshore Facilities and Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,603 | 22,406 | 69,173 | 85,241
Onshore Facilities and Transportation | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 136,372 | 108,183 | 428,940 | 275,265
Onshore Facilities and Transportation | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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