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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Total revenues $ 620,009 $ 725,808
Fee-based revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 172,979 152,527
Product Sales    
Disaggregation of Revenue [Line Items]    
Total revenues 429,387 551,336
Refinery Services    
Disaggregation of Revenue [Line Items]    
Total revenues 17,643 21,945
Onshore Facilities & Transportation    
Disaggregation of Revenue [Line Items]    
Total revenues 209,556 317,709
Onshore Facilities & Transportation | Fee-based revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 38,012 30,338
Onshore Facilities & Transportation | Product Sales    
Disaggregation of Revenue [Line Items]    
Total revenues 171,544 287,371
Onshore Facilities & Transportation | Refinery Services    
Disaggregation of Revenue [Line Items]    
Total revenues 0 0
Sodium Minerals & Sulfur Services    
Disaggregation of Revenue [Line Items]    
Total revenues 275,486 285,910
Sodium Minerals & Sulfur Services | Fee-based revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 0 0
Sodium Minerals & Sulfur Services | Product Sales    
Disaggregation of Revenue [Line Items]    
Total revenues 257,843 263,965
Sodium Minerals & Sulfur Services | Refinery Services    
Disaggregation of Revenue [Line Items]    
Total revenues 17,643 21,945
Offshore Pipeline Transportation    
Disaggregation of Revenue [Line Items]    
Total revenues 78,317 73,260
Offshore Pipeline Transportation | Fee-based revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 78,317 73,260
Offshore Pipeline Transportation | Product Sales    
Disaggregation of Revenue [Line Items]    
Total revenues 0 0
Offshore Pipeline Transportation | Refinery Services    
Disaggregation of Revenue [Line Items]    
Total revenues 0 0
Marine Transportation    
Disaggregation of Revenue [Line Items]    
Total revenues 56,650 48,929
Marine Transportation | Fee-based revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 56,650 48,929
Marine Transportation | Product Sales    
Disaggregation of Revenue [Line Items]    
Total revenues 0 0
Marine Transportation | Refinery Services    
Disaggregation of Revenue [Line Items]    
Total revenues $ 0 $ 0