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Debt - Wyoming Refining Credit Facility (Details) |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 14, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 | Aug. 31, 2016 | Jul. 31, 2016 | Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Principal amount of long-term debt |  | $ 412,961,000 |  |  |  | $ 170,119,000
Wyoming Refining Company | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line credit maximum borrowing amount | $ 30,000,000 |  |  |  |  |
Term Loan | Wyoming Refining Company |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Leverage ratio required, maximum |  | 2.5 |  | 2.5 | 2.5 |
Restricted cash |  | $ 10,000,000 |  |  |  |
Scenario, Forecast | Term Loan | Wyoming Refining Company |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Leverage ratio required, maximum |  |  | 3.00 |  |  |
Leverage ratio required, minimum |  |  | 1.25 |  |  |
London Interbank Offered Rate (LIBOR) | Wyoming Refining Company | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Margin on LIBOR rate | 3.00% |  |  |  |  |
Wyoming Refining Senior Secured Term Loan |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Quarterly principal payments |  | 2,300,000 |  |  |  |
Principal amount of long-term debt |  | 58,036,000 |  |  |  | 0
Wyoming Refining Senior Secured Revolver |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Principal amount of long-term debt |  | $ 16,600,000 |  |  |  | $ 0

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