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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 388,467 | $ 634,785 | $ 928,390 | $ 1,254,794
Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 143,529 | 174,897 | 325,294 | 347,876
Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 224,724 | 437,371 | 554,858 | 866,758
Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,214 | 22,517 | 48,238 | 40,160
Offshore Pipeline Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 64,964 | 78,427 | 143,393 | 156,744
Offshore Pipeline Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 64,964 | 78,427 | 143,393 | 156,744
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 | 192,624 | 274,606 | 436,014 | 550,092
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 | 172,410 | 252,089 | 387,776 | 509,932
Sodium Minerals & Sulfur Services | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,214 | 22,517 | 48,238 | 40,160
Marine Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 56,720 | 58,706 | 119,066 | 115,356
Marine Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 56,720 | 58,706 | 119,066 | 115,356
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 | 74,159 | 223,046 | 229,917 | 432,602
Onshore Facilities and Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 21,845 | 37,764 | 62,835 | 75,776
Onshore Facilities and Transportation | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 52,314 | 185,282 | 167,082 | 356,826
Onshore Facilities and Transportation | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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