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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Undesignated preferred stock, par value $ 0.01 $ 0.01
Undesignated preferred stock, shares authorized 10,000,000 10,000,000
Undesignated preferred stock, shares issued      
Undesignated preferred stock, shares outstanding      
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 550,000,000 550,000,000
Common stock, shares issued 386,934,914 369,391,972
Common stock, shares outstanding 386,934,914 369,391,972