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Commitments and Contingencies - Crude Oil Supply Agreement (Details) - New Vitol Agreement		3 Months Ended		6 Months Ended
	Aug. 31, 2012	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loss Contingencies [Line Items]
Renewal term of agreement	1 year
Notice of nonrenewal period prior to expiration	180 days
Petroleum Segment | Contracted Volume | Supplier Concentration Risk
Loss Contingencies [Line Items]
Volume contracted throughout Vitol as percentage of total crude oil purchases		40.00%	44.00%	40.00%	40.00%

X

- Definition

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

+ References

No definition available.

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- Definition

Represents the period of successive automatic renewal term for agreement.

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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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