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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
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 0 0
Undesignated preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 550,000,000 550,000,000
Common stock, shares issued 429,138,685 428,670,943
Common stock, shares outstanding 429,138,685 428,670,943