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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2012
Capital Stock [Abstract]  
Weighted average common shares outstanding for computing EPS
The following is a reconciliation of the weighted-average common shares outstanding for purposes of computing basic and diluted net income per share (in thousands):

 
 
Year Ended December 31,
 
 
 
2010
  
2011
  
2012
 
 
 
  
  
 
Basic weighted-average common shares outstanding
  
62,370
   
62,066
   
60,600
 
Effect of dilutive securities:
     Stock awards and options                                                                                                    
  
 
2,177
   
 
2,480
   
 
2,425
 
Diluted weighted-average common shares outstanding
  
64,547
   
64,546
   
63,025