Annual report pursuant to Section 13 and 15(d)

Document and Entity Information Document

v2.4.1.9
Document and Entity Information Document (USD $)
12 Months Ended
Dec. 31, 2014
Mar. 01, 2015
Jun. 30, 2014
Entity Information      
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-K    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   69,772,369dei_EntityCommonStockSharesOutstanding  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 327,903,310dei_EntityPublicFloat