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Commitments and Contingencies Commitment and Contingencies - Narrative (Details) |  |  | 1 Months Ended | 12 Months Ended | 29 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 22, 2018 USD ($) | Mar. 17, 2017 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) claim | Dec. 31, 2017 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2018 USD ($) claim | Jun. 17, 2013 USD ($) | Aug. 03, 2011 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought |  | $ 4,500,000 |  |  |  |  |  |  |  |
Multiplier for earnout payment before EBITDA |  |  |  |  |  |  |  |  |  | 4
Minimum EBITDA benchmark for earnout |  |  |  |  |  |  |  |  |  | $ 3,500,000.0
Maximum earnout payment amount |  |  |  |  |  |  |  |  |  | $ 4,500,000.0
RINs benefit (expense) |  |  |  | $ 1,100,000 |  |  |  |  |  |
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 |  |  |  |  |
Wyoming Refinery One |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Environmental costs recognized, period for recognition of one third costs |  |  |  | 5 years |  |  |  |  |  |
Environmental costs recognized, period for recognition |  |  |  | 30 years |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 17,300,000 |  |  |  | $ 17,300,000 |  |
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 |
Barbatas Earnout |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss contingency, damages paid |  |  | $ 350,000 |  |  |  |  |  |  |
Site contingency, loss exposure not accrued, best estimate |  |  | $ 300,000 |  |  |  |  |  |  |
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 |  |

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