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Acquisitions - Wyoming Refining Company Acquisition (Details) - USD ($) |  | 1 Months Ended
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Jul. 14, 2016 | Jun. 30, 2016
Wyoming Refining Company |  |
Business Acquisition [Line Items] |  |
Consideration transferred | $ 209,400,000 |
Other Long Term Assets | Wyoming Refining Company |  |
Business Acquisition [Line Items] |  |
Acquisition deposit |  | $ 5,000,000
Secured Debt | Wyoming Refining Company |  |
Business Acquisition [Line Items] |  |
Long-term debt assumed | 58,000,000 |
Aggregate principal amount | 65,000,000 |
5% Convertible Senior Notes due 2021 | Convertible Debt |  |
Business Acquisition [Line Items] |  |
Aggregate principal amount |  | $ 115,000,000
Revolving Credit Facility | Wyoming Refining Company |  |
Business Acquisition [Line Items] |  |
Long-term debt assumed | $ 10,100,000 |

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