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Document and Entity Information
9 Months Ended
Sep. 30, 2011
Nov. 03, 2011
Entity Information  
Document Type10-Q 
Amendment Flagfalse 
Document Period End DateSep. 30, 2011 
Document Fiscal Year Focus2011 
Document Fiscal Period FocusQ3 
Entity Registrant NameENERGEN CORP 
Entity Central Index Key0000277595 
Current Fiscal Year End Date--12-31 
Entity Filer CategoryLarge Accelerated Filer 
Entity Common Stock, Shares Outstanding 72,093,899
Alabama Gas Corporation
  
Entity Information  
Document Type10-Q 
Amendment Flagfalse 
Document Period End DateSep. 30, 2011 
Document Fiscal Year Focus2011 
Document Fiscal Period FocusQ3 
Entity Registrant NameALABAMA GAS CORP 
Entity Central Index Key0000003146 
Current Fiscal Year End Date--12-31 
Entity Filer CategoryNon-accelerated Filer 
Entity Common Stock, Shares Outstanding 1,972,052