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Consolidated BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Stockholders' equity    
Preferred Stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred Stock, shares issued (in shares) 0 0
Common Stock, par value (in dollars per share) $ 1 $ 1
Common Stock [Member]
    
Stockholders' equity    
Common Stock, shares authorized (in shares) 50,000,000 50,000,000
Common Stock, shares issued (in shares) 27,212,000 26,578,000
Treasury stock, Common stock shares (in shares) 7,741,000 7,749,000
Convertible Class A Common Stock [Member]
    
Stockholders' equity    
Common Stock, shares authorized (in shares) 15,000,000 15,000,000
Common Stock, shares issued (in shares) 3,297,000 3,642,000
Treasury stock, Common stock shares (in shares) 522,000 522,000