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Earnings Per Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Share

Note 4.    Earnings Per Share

 

Basic earnings per share is based on the weighted average number of common shares outstanding during the period. Diluted earnings per share includes the effect of options that are dilutive and outstanding during the period. Per share amounts are computed as follows:

 

                         
    2012     2011     2010  

Numerator (in millions):

                        

Net income available to common stockholders

   $ 68.3     $ 48.9     $ 73.7  
   

 

 

    

 

 

    

 

 

  

Denominator (in thousands):

                        

Weighted average common shares outstanding

     23,187       23,568       23,756  

Dilutive effect of stock options and awards

     663       952       1,058  
   

 

 

    

 

 

    

 

 

  

Denominator for diluted earnings per share

     23,850       24,520       24,814  
   

 

 

    

 

 

    

 

 

  

Net income per share, basic:

   $ 2.95     $ 2.07     $ 3.10  
   

 

 

    

 

 

    

 

 

  

Net income per share, diluted:

   $ 2.86     $ 1.99     $ 2.97  
   

 

 

    

 

 

    

 

 

  

 

In 2012, 2011 and 2010 the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 1,380, 690 and 61,808 respectively.