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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000 5,000
Preferred stock, shares issued 5,000 5,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 118,400,000 118,400,000
Treasury stock, shares 4,400,000 4,100,000