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Earnings Per Share
 12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]  
Earnings Per Share

Note 5.    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:

 

     2011
      2010
      2009
  

Numerator (in millions):

                           

Net income available to common stockholders

    $ 48.9       $ 73.7       $ 6.4   
    
  
  

Denominator (in thousands):

                           

Weighted average common shares outstanding

      23,568         23,756         23,642   

Dilutive effect of stock options and awards

      952         1,058         1,072   
    
  
  

Denominator for diluted earnings per share

      24,520         24,814         24,714   
    
  
  

Net income per share, basic:

    $ 2.07       $ 3.10       $ 0.27   
    
  
  

Net income per share, diluted:

    $ 1.99       $ 2.97       $ 0.26   
    
  
  

In 2011, 2010 and 2009 the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 690, 61,808 and 146,325 respectively.