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Commitments and Contingencies (Details) | 6 Months Ended
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Jun. 30, 2020 USD ($) refinery claim
Long-term Purchase Commitment [Line Items] |
Number of owned and operated refineries | refinery | 4
Number of remaining claim to be resolved | claim | 2
Bankruptcy claims amount of claims to be settled | $ 22,400,000
Estimated value of claims remaining to be settled | 500,000
Maximum bankruptcy claims remaining | $ 22,400,000
Predecessor working ownership percentage | 3.40%
Allowed claims, settlement ratio | 0.0544
Wyoming Refinery One |
Long-term Purchase Commitment [Line Items] |
Environmental remediation accrual | $ 16,000,000.0
Environmental costs recognized, period for recognition of one third costs | 5 years
Environmental costs recognized, remainder, period for recognition | 30 years
Wyoming Refinery Two | Waste Water Treatment System |
Long-term Purchase Commitment [Line Items] |
Environmental remediation accrual | $ 11,600,000
Wyoming Refinery |
Long-term Purchase Commitment [Line Items] |
Loss contingency, range of possible loss | 100,000
Tesoro Corporation | Indemnification Agreement |
Long-term Purchase Commitment [Line Items] |
Deductible for indemnification obligation | 1,000,000
Indemnification obligation cap | $ 15,000,000

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