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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Common stock, par value $ 1 $ 1
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 20,499,683 20,493,057
Treasury stock, shares 2,107,663 1,978,478
Undesignated Par Value
    
Preferred stock      
Preferred stock, shares authorized 1,000,000 1,000,000
Designated Par Value
    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 25,000 25,000
Preferred stock, shares outstanding 15,151 15,251