XML 56 R44.htm IDEA: XBRL DOCUMENT v3.7.0.1
Acquisitions - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 14, 2016
Jun. 30, 2016
Jun. 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