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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 23,444,881 22,427,955
Common stock, shares outstanding 23,444,881 22,427,955