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NET INCOME PER SHARE (Tables)
9 Months Ended
Sep. 25, 2015
Earnings Per Share [Abstract]  
Schedule of adjusted net income and diluted common shares
Diluted common shares were calculated as follows (in thousands, except per share amounts):
 
Thirteen weeks ended
 
Thirty-nine weeks ended
 
September 25,
2015

September 26,
2014
 
September 25,
2015
 
September 26,
2014
Net income
$
20,090

 
$
20,910

 
$
43,079

 
$
38,650

 
 
 
 
 
 
 
 
Weighted average number of common shares used in basic net income per common share
41,296

 
40,793

 
41,189

 
40,701

Dilutive effect of outstanding stock options and non-vested restricted stock
324

 
245

 
357

 
270

Weighted average number of common shares used in diluted net income per common share
41,620

 
41,038

 
41,546

 
40,971

Net income per common share:
 
 
 
 
 
 
 
Basic
$
0.49

 
$
0.51

 
$
1.05

 
$
0.95

Diluted
$
0.48

 
$
0.51

 
$
1.04

 
$
0.94

 
 
 
 
 
 
 
 
Anti-dilutive shares
91

 
97

 
227

 
35