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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The computation of basic and diluted earnings per share is as follows (in thousands, except per share amounts):

 
  
 
Quarters Ended June 30,
  
Six Months Ended June 30,
 
Numerator
 
2013
  
2012
  
2013
  
2012
 
 
Net income
 
$
16,279
  
$
14,614
  
$
35,881
  
$
27,606
 
 
Percentage allocated to shareholders (1)
  
99.8
%
  
99.4
%
  
99.7
%
  
99.4
%
 
Numerator for basic and diluted earnings per share
 
$
16,246
  
$
14,526
  
$
35,773
  
$
27,440
 
 
 
                
Denominator
                
 
Denominator for basic earnings per share -
                
 
   weighted-average shares outstanding
  
60,058
   
58,991
   
59,918
   
58,966
 
 
Dilutive effect of stock options and restricted stock units
  
319
   
290
   
310
   
313
 
 
Denominator for diluted earnings per share
  
60,377
   
59,281
   
60,228
   
59,279
 
 
 
                
Per share income
                
 
Basic
 
$
0.27
  
$
0.25
  
$
0.60
  
$
0.47
 
 
Diluted
  
0.27
   
0.25
   
0.59
   
0.46
 
_________________________
                
 
 
                
  
(1) 
Basic weighted-average shares outstanding
  
60,058
   
58,991
   
59,918
   
58,966
 
   
Basic weighted-average shares outstanding and
                
   
   unvested restricted share units expected to vest
  
60,205
   
59,327
   
60,069
   
59,307
 
   
Percentage allocated to shareholders
  
99.8
%
  
99.4
%
  
99.7
%
  
99.4
%