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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 443,125 | $ 621,697 | $ 1,371,515 | $ 1,876,491
Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 128,211 | 176,079 | 453,505 | 523,955
Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 296,384 | 427,423 | 851,242 | 1,294,181
Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,530 | 18,195 | 66,768 | 58,355
Offshore Pipeline Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 53,893 | 79,738 | 197,286 | 236,482
Offshore Pipeline Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 53,893 | 79,738 | 197,286 | 236,482
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 | 206,731 | 277,527 | 642,745 | 827,619
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 | 188,201 | 259,332 | 575,977 | 769,264
Sodium Minerals & Sulfur Services | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,530 | 18,195 | 66,768 | 58,355
Marine Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 51,912 | 59,404 | 170,978 | 174,760
Marine Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 51,912 | 59,404 | 170,978 | 174,760
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 | 130,589 | 205,028 | 360,506 | 637,630
Onshore Facilities and Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,406 | 36,937 | 85,241 | 112,713
Onshore Facilities and Transportation | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 108,183 | 168,091 | 275,265 | 524,917
Onshore Facilities and Transportation | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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