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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