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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Preferred stock, par value $ 0.5 $ 0.5
Common Stock [Member]
   
Common stock, par value $ 0.5 $ 0.5
Class B Common Stock [Member]
   
Common stock, par value $ 0.5 $ 0.5