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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 4,000,000 4,000,000
Common stock, shares issued 3,836,397 3,836,397
Treasury stock, shares 1,423,519 1,325,837