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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]    
Common stock, par value      
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 19,699,237 20,020,535
Common stock, shares outstanding 19,699,237 20,020,535