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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 503,855 | $ 388,467 | $ 1,025,074 | $ 928,390
Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 139,023 | 143,529 | 268,132 | 325,294
Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 340,179 | 224,724 | 709,780 | 554,858
Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,653 | 20,214 | 47,162 | 48,238
Offshore Pipeline Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 73,221 | 64,964 | 137,605 | 143,393
Offshore Pipeline Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 73,221 | 64,964 | 137,605 | 143,393
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 | 237,087 | 192,624 | 464,374 | 436,014
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 | 212,434 | 172,410 | 417,212 | 387,776
Sodium Minerals & Sulfur Services | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,653 | 20,214 | 47,162 | 48,238
Marine Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 47,626 | 56,720 | 87,957 | 119,066
Marine Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 47,626 | 56,720 | 87,957 | 119,066
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 | 145,921 | 74,159 | 335,138 | 229,917
Onshore Facilities and Transportation | Fee-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,176 | 21,845 | 42,570 | 62,835
Onshore Facilities and Transportation | Product Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 127,745 | 52,314 | 292,568 | 167,082
Onshore Facilities and Transportation | Refinery Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0

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