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Long-Term Obligations and Notes Payable Alon Convertible Senior Notes (Details) - USD ($)
12 Months Ended
Nov. 09, 2018
Sep. 17, 2018
Jul. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]            
Common stock, par or stated value per share (USD per share)     $ 0.01 $ 0.01 $ 0.01  
Payments of dividends       $ 80,100,000 $ 44,000,000.0 $ 37,500,000
Alon USA Energy, Inc.            
Debt Instrument [Line Items]            
Common stock, par or stated value per share (USD per share)     $ 0.01      
Alon USA Energy, Inc.            
Debt Instrument [Line Items]            
Interest rate, stated percentage     3.00%      
Principal amount of note convertible into common shares     $ 1,000      
Senior Notes | Alon Convertible Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, face amount     $ 150,000,000.0      
Cash payment for accrued interest   $ 2,200,000        
Repayments of convertible debt   152,500,000        
Convertible, beneficial conversion feature         26,600,000  
Number of securities called by purchased options (in shares)     5,700,000      
Purchased Options balance         23,300,000  
Payments of dividends   $ 300,000        
Adjusted strike price of warrants (USD per share)       $ 35    
Warrants outstanding         $ 14,300,000  
Payment to warrant holders in satisfaction of obligation $ 36,000,000          
Alon USA Energy, Inc.            
Debt Instrument [Line Items]            
Equity interest issued per acquiree share     0.504      
Exercise Of Call Options | Senior Notes | Alon Convertible Senior Notes            
Debt Instrument [Line Items]            
Number of shares issued in transaction (in shares)   2,700,000        
Payments of dividends   $ 300,000