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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, Authorized shares 20,000,000 20,000,000
Preferred stock, Issued shares      
Preferred stock, outstanding shares      
Common stock, par value $ 0.01 $ 0.01
Common stock, Authorized shares 150,000,000 150,000,000
Common stock, Issued shares 22,430,234 21,920,836
Common stock, outstanding shares 22,430,234 21,920,836