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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares, issued 34,676,359 34,447,037
Preferred stock, par value $ 0.5 $ 0.5
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common Stock [Member]
    
Common stock, par value $ 0.5 $ 0.5
Treasury stock, shares 6,322,650 6,322,650
Class B Common Stock [Member]
    
Common stock, par value $ 0.5 $ 0.5
Common stock, shares authorized 10,000,000 10,000,000
Common stock, shares, issued 4,699,895 4,373,301
Treasury stock, shares 48,263 48,263