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Commitments and Contingencies - Crude Oil Supply Agreement (Details) - Crude Oil Supply Agreement |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
Renewal term of agreement | 1 year |  |  |
Number of days for prior notice of nonrenewal | 180 days |  |  |
Petroleum Segment | Contracted Volume | Supplier Concentration Risk |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
Volume contracted throughout Vitol as percentage of total crude oil purchases |  | 42.00% | 55.00% | 61.00%

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