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Acquisitions - Wyoming Refining Company Acquisition (Details) - USD ($)
1 Months Ended
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