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NET INCOME PER SHARE
 3 Months Ended
Mar. 27, 2015
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):
 
Thirteen weeks ended
 
March 27, 2015
 
March 28, 2014
Net income
$
5,716

 
$
1,656

 
 
 
 
Weighted average number of common shares used in basic net income per common share
41,031

 
40,572

Dilutive effect of outstanding stock options and non-vested restricted stock
331

 
319

Weighted average number of common shares used in diluted net income per common share
41,362

 
40,891

Net income per common share:
 
 
 
Basic
$
0.14

 
$
0.04

Diluted
$
0.14

 
$
0.04

 
 
 
 
Anti-dilutive shares
266

 
—


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.