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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Preferred stock, par value $ 0.50 $ 0.50
Common Stock [Member]
   
Common stock, par value $ 0.50 $ 0.50
Class B Common Stock [Member]
   
Common stock, par value $ 0.50 $ 0.50