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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Stockholders' equity    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 170,000,000 170,000,000
Common stock, shares issued (in shares) 73,422,008 48,237,634
Common stock, shares outstanding (in shares) 73,393,908 48,209,534
Treasury stock, at cost (in shares) 28,100 28,100