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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Stockholders' equity    
Preferred Stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, shares authorized (in shares) 1,000 1,000
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 50,000
Common Stock, shares issued (in shares) 27,816 27,212
Treasury stock, Common stock shares (in shares) 7,731 7,741
Convertible Class A Common Stock [Member]
    
Stockholders' equity    
Common Stock, shares authorized (in shares) 15,000 15,000
Common Stock, shares issued (in shares) 2,950 3,297
Treasury stock, Common stock shares (in shares) 522 522