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Commitments and Contingencies Legal, Environmental or Regulatory (Details)
$ in Thousands
 1 Months Ended 25 Months Ended 47 Months Ended
May 16, 2016
employee
count
May 31, 2015
bbl
May 31, 2018
count
Mar. 31, 2019
USD ($)
count
lawsuit
Apr. 25, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 07, 2018
count
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       $ 134,000   $ 135,000  
Amounts probable of recovery under insurance and from third parties under indemnification agreements       62,000   61,000  
Trade accounts receivable and other receivables, net              
Legal, Environmental or Regulatory Matters              
Amounts probable of recovery under insurance and from third parties under indemnification agreements       29,000   28,000  
Other long-term assets, net              
Legal, Environmental or Regulatory Matters              
Amounts probable of recovery under insurance and from third parties under indemnification agreements       33,000   33,000  
Other current liabilities              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, short-term       41,000   43,000  
Other long-term liabilities and deferred credits              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, long-term       93,000   $ 92,000  
Line 901 Incident              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       75,000      
Amounts probable of recovery under insurance and from third parties under indemnification agreements       53,000      
Estimated size of release (in bbl) | bbl   2,934          
Estimated size of release to reach Pacific Ocean (in bbl) | bbl   598          
Aggregate total estimated costs       355,000      
Recoveries from insurance carriers       187,000      
Total release costs probable of recovery       240,000      
Line 901 Incident | Trade accounts receivable and other receivables, net              
Legal, Environmental or Regulatory Matters              
Amounts probable of recovery under insurance and from third parties under indemnification agreements       23,000      
Line 901 Incident | Other current liabilities              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, short-term       $ 32,000      
Line 901 Incident | May 2016 Indictment              
Legal, Environmental or Regulatory Matters              
Number of employees charged | employee 1            
Total counts included in the indictment | count 46     15      
Number of felony discharges found guilty | count             1
Number of misdemeanor charges found guilty | count             8
Number of misdemeanor charges found guilty, reporting count | count             1
Number of misdemeanor charges found guilty, strict liability discharge count | count             1
Number of misdemeanor charges found guilty, strict liability animal takings count | count             6
Number of misdemeanor charges found not guilty, strict liability animal takings count | count             1
Number of charges jury deadlocked | count             3
Number of charges jury deadlocked, felony discharges | count             2
Number of charges jury deadlocked, strict liability animal takings count | count             1
Number of misdemeanor charges dropped | count             2
Total number of counts dismissed | count     31        
Number of felony charges dismissed | count     1        
Line 901 Incident | Class Action Lawsuits              
Legal, Environmental or Regulatory Matters              
Number of cases filed during the period | lawsuit       9      
Number of cases consolidated into a single proceeding | lawsuit       6      
Line 901 Incident | Securities Law Class Action Lawsuits              
Legal, Environmental or Regulatory Matters              
Number of cases filed during the period | lawsuit       2      
Line 901 Incident | Unitholder Derivative Lawsuits              
Legal, Environmental or Regulatory Matters              
Number of cases filed during the period | lawsuit       4      
Subsequent event | Line 901 Incident | May 2016 Indictment              
Legal, Environmental or Regulatory Matters              
Fines or penalties assessed         $ 3,350