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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Sep. 30, 2012
Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 136,275,092 132,153,444
Common stock, shares outstanding 136,275,092 132,153,444