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NET INCOME PER SHARE
 12 Months Ended
Dec. 26, 2014
Earnings Per Share [Abstract]  
NET INCOME PER SHARE
NET INCOME PER SHARE
Diluted common shares were calculated as follows (in thousands, except per share amounts):
 
Years ended
 
2014
 
2013
 
2012
Net income
$
65,675

 
$
44,924

 
$
33,629

 
 
 
 
 
 
Weighted average number of common shares used in basic net income per common share
40,734

 
40,166

 
39,548

Dilutive effect of outstanding stock options and non-vested restricted stock
442

 
336

 
314

Weighted average number of common shares used in diluted net income per common share
41,176

 
40,502

 
39,862

   Net income per common share:
 
 
 
 
 
Basic
$
1.61

 
$
1.12

 
$
0.85

Diluted
$
1.59

 
$
1.11

 
$
0.84

 
 
 
 
 
 
Anti-dilutive shares
58

 
78

 
726


Basic net income per share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted net income per share is calculated by dividing net income by the weighted average number of common shares and potential common shares outstanding during the period. Potential common shares include the dilutive effects of outstanding options, non-vested restricted stock, performance share units, and shares issued under the employee stock purchase plan, except where their inclusion would be anti-dilutive.
Anti-dilutive shares include unvested restricted stock, performance share units, and in-the-money options for which the sum of the assumed proceeds, including unrecognized compensation expense, exceeds the average stock price during the periods presented. Anti-dilutive shares associated with our stock options relate to those stock options with an exercise price higher than the average market value of our stock during the periods presented.