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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
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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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