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Earnings Per Common Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Common Share  
Earnings Per Common Share

17.       EARNINGS PER COMMON SHARE

Basic income from continuing operations per common share represents income from continuing operations attributable to American Tower Corporation divided by the weighted average number of common shares outstanding during the period. Diluted income from continuing operations per common share represents income from continuing operations attributable to American Tower Corporation divided by the weighted average number of common shares outstanding during the period and any dilutive common share equivalents, including unvested restricted stock, shares issuable upon exercise of stock options and warrants as determined under the treasury stock method and upon conversion of the Company's convertible notes, as determined under the if-converted method. Dilutive common share equivalents also include the dilutive impact of the Verizon transaction (see note 18).

 

The following table sets forth basic and diluted income from continuing operations per common share computational data for the years ended December 31, 2012, 2011 and 2010 (in thousands, except per share data):

 

           
   2012 2011 2010
           
 Income from continuing operations attributable to American Tower Corporation$ 637,283 $ 396,462 $ 372,906
           
 Basic weighted average common shares outstanding  394,772   395,711   401,152
 Dilutive securities  4,515   4,484   2,920
 Diluted weighted average common shares outstanding  399,287   400,195   404,072
           
 Basic income from continuing operations attributable to        
  American Tower Corporation per common share$ 1.61 $ 1.00 $0.93
           
 Diluted income from continuing operations attributable to         
  American Tower Corporation per common share$ 1.60 $ 0.99 $0.92
           

For the year ended December 31, 2010, the weighted average number of common shares outstanding excludes shares issuable upon conversion of the Company's convertible notes of 0.1 million. For the years ended December 31, 2012, 2011 and 2010, the diluted weighted average number of common shares outstanding excludes shares issuable upon exercise of the Company's stock options and share based awards of 1.0 million, 0.9 million and 1.1 million, respectively, as the effect would be anti-dilutive.