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Debt - Wyoming Refining Credit Facilities (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2017 | Apr. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Cost associated with termination of debt |  |  | $ 8,633,000 | $ 0 | $ 19,669,000
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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