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Schedule II: Valuation and Qualifying accounts
12 Months Ended
Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]  
Schedule II: Valuation and Qualifying Accounts [Text Block]
ALEXANDER’S, INC. AND SUBSIDIARIES
                 
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS
(Amounts in thousands)
                 
 Column A Column B Column C Column D Column E  
       Additions: Deductions:     
    Balance at  Charged  Uncollectible  Balance  
    Beginning Against Accounts  at End  
 Description of Year Operations Written Off of Year  
                 
 Allowance for doubtful accounts:              
  Year Ended December 31, 2011 $1,047 $427 $(435) $1,039  
                 
  Year Ended December 31, 2010 $1,736 $(22) $(667) $1,047  
                 
  Year Ended December 31, 2009 $1,357 $540 $(161) $1,736