Earnings Per Share
9 Months Ended
Sep. 30, 2011
Earnings Per Share [Abstract] 
Earnings Per Share
(4)  Earnings Per Share

The computation of basic and diluted earnings per share (“EPS”) is as follows (in thousands, except per share amounts):
     
Quarters Ended
  
Nine Months Ended
 
     
September 30,
  
September 30,
 
Numerator
 
2011
  
2010
  
2011
  
2010
 
 
Net income
 $16,473  $10,629  $50,024  $26,242 
 
Percentage allocated to shareholders (1)
  99.2%  98.9%  99.0%  99.1%
 
Numerator for basic and diluted earnings per share
 $16,341  $10,512  $49,524  $26,005 
                    
Denominator
                
 
Denominator for basic earnings per share -
                
 
   weighted-average shares outstanding
  58,598   57,899   58,441   57,550 
 
Dilutive effect of stock options
  389   583   445   676 
 
Dilutive effect of restricted stock units
  —   —   99   — 
 
Denominator for diluted earnings per share
  58,987   58,482   58,985   58,226 
                    
Per share income
                
 
Basic
 $0.28  $0.18  $0.85  $0.45 
 
Diluted
  0.28   0.18   0.84   0.45 
_________________________
                
                    
 (1)
Basic weighted-average shares outstanding
  58,598   57,899   58,441   57,550 
 
Basic weighted-average shares outstanding and
                
 
   unvested restricted share units expected to vest
  59,062   58,514   59,047   58,071 
 
Percentage allocated to shareholders
  99.2%  98.9%  99.0%  99.1%

The calculation of EPS shown above excludes the income attributable to certain of the company’s unvested restricted stock units from the numerator and excludes the impact of those units from the denominator.  Diluted weighted-average shares for all periods exclude the effect of the company’s convertible senior subordinated notes that were anti-dilutive.