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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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- Definition

Represents the number of days for prior notice from expiration of the initial term or any renewal term for nonrenewal of agreement.

+ References

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- Definition

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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