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Acquisitions - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Jul. 14, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Sep. 30, 2017
Wyoming Refining Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration transferred | $ 209,400,000 |  |  |
Adjustment to WRC environmental liability (other non-current liabilities) |  |  | $ 2,000,000 |
Adjustment to inventory |  |  | 500,000 |
Adjustments to goodwill |  |  | $ 1,500,000 |
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] |  |  |  |
Aggregate principal amount | 65,000,000 |  |  |
Wyoming Refining Senior Secured Term Loan | Secured Debt | Wyoming Refining Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Long-term debt | 58,036,000 |  |  |
Wyoming Refining Senior Secured Revolver | Revolving Credit Facility | Wyoming Refining Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Long-term debt | $ 10,100,000 |  |  |
Convertible Subordinated Bridge Notes |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt instrument, interest rate | 2.50% |  |  |
5.00% Convertible Senior Notes due 2021 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt instrument, interest rate | 5.00% |  |  | 5.00%
5.00% Convertible Senior Notes due 2021 | Convertible Debt |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt instrument, interest rate |  |  |  | 5.00%
Aggregate principal amount | $ 115,000,000 |  |  |

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