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Commitments and Contingencies Legal, Environmental or Regulatory (Details)
$ in Thousands
1 Months Ended 25 Months Ended 50 Months Ended
May 16, 2016
employee
count
May 31, 2015
bbl
May 31, 2018
count
Jun. 30, 2019
USD ($)
lawsuit
Apr. 25, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 07, 2018
count
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       $ 143,000   $ 135,000  
Amounts probable of recovery under insurance and from third parties under indemnification agreements       74,000   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       43,000   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       31,000   33,000  
Other current liabilities              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, short-term       64,000   43,000  
Other long-term liabilities and deferred credits              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, long-term       79,000   $ 92,000  
Line 901 Incident              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       88,000      
Amounts probable of recovery under insurance and from third parties under indemnification agreements       67,000      
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       380,000      
Recoveries from insurance carriers       188,000      
Total release costs probable of recovery       255,000      
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       38,000      
Line 901 Incident | Other current liabilities              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, short-term       $ 55,000      
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            
Number of felony discharges found guilty | count             1
Number of misdemeanor charges found guilty | count             8
Number of misdemeanor charges found guilty, reporting | count             1
Number of misdemeanor charges found guilty, strict liability discharge | count             1
Number of misdemeanor charges found guilty, strict liability animal takings | count             6
Number of misdemeanor charges found not guilty, strict liability animal takings | 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 discharges dropped | count             2
Number of counts dismissed | count     31        
Number of felony charges dismissed | count     1        
Fines or penalties assessed         $ 3,350    
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