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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Condensed Consolidated Balance Sheets Parenthetical  
Common stock, par value$ 2.50$ 2.50
Common stock, shares authorized8,000,0008,000,000
Common stock, shares issued4,416,8244,374,574
Treasury stock, shares1,315,2371,305,237