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Debt - Par Wyoming Holdings Credit Agreement (Details) - Wyoming Refining Company - USD ($) | Dec. 21, 2017 | Jul. 14, 2016
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Secured Debt |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 9.50%
Basis spread on variable rate, paid in kind |  | 13.00%
Secured Debt |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount |  | $ 65,000,000.0
Cost associated with termination of debt | $ 5,200,000 |

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