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Commitments and Contingencies Commitment and Contingencies - Narrative (Details)
 12 Months Ended 17 Months Ended
Dec. 31, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
claim
Jun. 17, 2013
USD ($)
Long-term Purchase Commitment [Line Items]          
Loss contingency, damages sought $ 4,500,000        
Multiplier for earnout payment before EBITDA 4     4  
Minimum EBITDA benchmark for earnout $ 3,500,000.0     $ 3,500,000.0  
Maximum earnout payment amount $ 4,500,000.0     4,500,000.0  
Site contingency reimbursement       12,100,000  
Site contingencies capital expenditures       $ 12,900,000  
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      
Clear Air Act Violation          
Long-term Purchase Commitment [Line Items]          
Site contingency, loss exposure not accrued, best estimate $ 30,000,000        
Pending Litigation          
Long-term Purchase Commitment [Line Items]          
Claim amount for environmental losses 1,000,000     $ 1,000,000  
Wyoming Refinery One          
Long-term Purchase Commitment [Line Items]          
Environmental costs recognized, capitalized $ 18,200,000     18,200,000  
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]          
Environmental costs recognized, capitalized $ 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  
Loss contingency, loss in period 279,400        
Tesoro Corporation          
Long-term Purchase Commitment [Line Items]          
Contingent consideration, liability         $ 20,000,000
Loss contingency, damages paid   $ 16,800,000      
Loss contingency, damages sought   $ 8,300,000 $ 4,300,000    
Maximum | Tesoro Corporation          
Long-term Purchase Commitment [Line Items]          
Contingent consideration, liability         $ 40,000,000
Indemnification Agreement | Tesoros          
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