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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