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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 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) 76,849,033 48,237,630
Common stock, shares outstanding (in shares) 76,820,933 48,209,530
Treasury stock, at cost (in shares) 28,100 28,100