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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Preferred stock    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued      
Common stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 39,212,689 37,512,127
Common stock, shares outstanding 39,212,689 37,512,127