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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Mar. 31, 2013
Dec. 31, 2012
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) 91,212,524 76,849,033
Common stock, shares outstanding (in shares) 91,184,424 76,820,933
Treasury stock, at cost (in shares) 28,100 28,100