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Acquisitions - Wyoming Refining Company Acquisition (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 14, 2016
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]            
Acquisition deposit         $ 209,183,000 $ 0
Revenues     $ 510,305,000 $ 495,503,000 1,301,909,000 1,622,873,000
Net income (loss)     (27,761,000) $ 14,740,000 $ (59,522,000) $ 26,925,000
Wyoming Refining Company            
Business Acquisition [Line Items]            
Consideration transferred $ 209,400,000          
Liabilities assumed 58,000,000          
Revenues     83,900,000      
Net income (loss)     $ 1,400,000      
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]            
Aggregate principal amount 65,000,000          
5% Convertible Senior Notes due 2021 | Convertible Debt            
Business Acquisition [Line Items]            
Aggregate principal amount $ 115,000,000