Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information Document

v3.2.0.727
Document and Entity Information Document - shares
6 Months Ended
Jun. 30, 2015
Jul. 31, 2015
Document Information [Line Items]    
Entity Registrant Name Alon USA Energy, Inc.  
Entity Central Index Key 0001325955  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Document Type 10-Q  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   70,783,704