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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Summary of Earnings per share
                         
    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