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Debt - Wyoming Refining Credit Facilities (Details) - USD ($) | Dec. 21, 2017 | Jul. 14, 2016
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Revolving Credit Facility | Wyoming Refining Senior Secured Revolver |  |
Debt Instrument [Line Items] |  |
Line credit maximum borrowing amount |  | $ 30,000,000
Cost associated with termination of debt | $ 100,000 |
Term Loan | Wyoming Refining Senior Secured Term Loan |  |
Debt Instrument [Line Items] |  |
Periodic payment, principal amount |  | $ 2,300,000
Term Loan | Wyoming Refining Company | Wyoming Refining Senior Secured Term Loan | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 3.00%

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