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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 428,852,227 428,433,703
Common stock, shares outstanding 428,852,227 428,433,703