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Debt - Wyoming Refining Credit Facilities (Details) - Wyoming Refining Company | Jul. 14, 2016 USD ($) | Dec. 31, 2016 USD ($)
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Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Restricted cash and cash equivalents |  | $ 10,000,000
Revolving Credit Facility | Wyoming Refining Senior Secured Revolver |  |
Debt Instrument [Line Items] |  |
Line credit maximum borrowing amount | $ 30,000,000 |
Revolver and Term Loan |  |
Debt Instrument [Line Items] |  |
Maximum leverage ratio |  | 3.00
Consolidated leverage ratio minimum |  | 1.25
Term Loan | Wyoming Refining Senior Secured Term Loan |  |
Debt Instrument [Line Items] |  |
Periodic payment, principal amount | $ 2,300,000 |
Term Loan | 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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