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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 621,697 | $ 745,278 | $ 1,876,491 | $ 2,223,474
Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 176,079 | 168,599 | 523,955 | 482,290
Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 427,423 | 553,164 | 1,294,181 | 1,665,994
Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,195 | 23,515 | 58,355 | 75,190
Onshore Facilities & Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 205,028 | 327,145 | 637,630 | 972,207
Onshore Facilities & Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 36,937 | 42,188 | 112,713 | 107,536
Onshore Facilities & Transportation | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 168,091 | 284,957 | 524,917 | 864,671
Onshore Facilities & 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 | 277,527 | 291,722 | 827,619 | 876,513
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 | 259,332 | 268,207 | 769,264 | 801,323
Sodium Minerals & Sulfur Services | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,195 | 23,515 | 58,355 | 75,190
Offshore Pipeline Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79,738 | 70,115 | 236,482 | 213,344
Offshore Pipeline Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79,738 | 70,115 | 236,482 | 213,344
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
Marine Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,404 | 56,296 | 174,760 | 161,410
Marine Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 59,404 | 56,296 | 174,760 | 161,410
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

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