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Debt - Schedule of Leverage Ratio (Details) - Term Loan - Wyoming Refining Company	Dec. 31, 2016	Nov. 30, 2016	Oct. 31, 2016	Sep. 30, 2016	Aug. 31, 2016	Jul. 31, 2016
Debt Instrument [Line Items]
Leverage ratio required, maximum				2.5	2.5	2.5
Subsequent Event
Debt Instrument [Line Items]
Leverage ratio required, maximum	3.0	3.0	3.0

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- Definition

Debt Instrument, Covenant, Leverage Ratio Required, Maximum

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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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