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Commitments and Contingencies Commitment and Contingencies - Narrative (Details)
12 Months Ended 41 Months Ended
Mar. 22, 2018
USD ($)
Dec. 31, 2019
USD ($)
refinery
claim
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2019
USD ($)
refinery
claim
Jun. 17, 2013
USD ($)
Long-term Purchase Commitment [Line Items]                
Renewable identification numbers (RINs) benefit   $ 5,300,000            
Number of owned and operated refineries | refinery   4         4  
Site contingency reimbursement             $ 12,200,000  
Bankruptcy claims number of claims to be settled | claim   2         2  
Bankruptcy claims amount of claims to be settled   $ 22,400,000         $ 22,400,000  
Settlement liabilities, current   500,000         500,000  
Maximum bankruptcy claims remaining   $ 22,400,000         $ 22,400,000  
Predecessor working ownership percentage   3.40%         3.40%  
Allowed claims, settlement ratio     0.0544          
One Major Customer | Customer Concentration Risk | Revenue from Contract with Customer Benchmark                
Long-term Purchase Commitment [Line Items]                
Concentration risk, percentage       10.00%        
Wyoming Refinery One                
Long-term Purchase Commitment [Line Items]                
Accrual for environmental loss contingencies   $ 16,500,000         $ 16,500,000  
Environmental costs recognized, period for recognition of one third costs   5 years            
Environmental costs recognized, period for recognition   30 years            
Wyoming Refinery Two | Waste Water Treatment System                
Long-term Purchase Commitment [Line Items]                
Accrual for environmental loss contingencies   $ 11,600,000         11,600,000  
Wyoming Refinery                
Long-term Purchase Commitment [Line Items]                
Loss contingency, range of possible loss, portion not accrued   100,000         100,000  
Maximum | Tesoro Corporation                
Long-term Purchase Commitment [Line Items]                
Contingent consideration, liability               $ 40,000,000
Tesoro Corporation                
Long-term Purchase Commitment [Line Items]                
Contingent consideration, liability               $ 20,000,000
Loss contingency, damages paid $ 10,500,000       $ 16,800,000      
Loss contingency, damages sought         $ 8,300,000 $ 4,300,000    
Tesoro Corporation | Indemnification Agreement                
Long-term Purchase Commitment [Line Items]                
Guarantor obligations, deductible   1,000,000         1,000,000  
Guarantor obligations, maximum exposure, undiscounted   $ 15,000,000         $ 15,000,000