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Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Common Stock    
Common Stock, Par Value (in dollars per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized (in shares) 640,000,000 640,000,000
Common Stock, Shares Issued (in shares) 550,052,879 549,028,374
Treasury Stock (in shares)    
Common Stock Held in Treasury, Shares 383,870 733,517