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NET INCOME (LOSS) PER SHARE
 6 Months Ended
Jun. 24, 2016
Earnings Per Share [Abstract]  
NET INCOME (LOSS) PER SHARE
NET INCOME (LOSS) PER SHARE

Diluted common shares were calculated as follows (in thousands, except per share amounts):
 
Thirteen weeks ended
 
Twenty-six weeks ended
 
June 24, 2016

June 26, 2015
 
June 24,
2016
 
June 26,
2015
Net income (loss)
$
(63,735
)
 
$
17,273

 
$
(56,767
)
 
$
22,989

 
 
 
 
 
 
 
 
Weighted average number of common shares used in basic net income (loss) per common share
41,688

 
41,240

 
41,595

 
41,135

Dilutive effect of non-vested restricted stock
—

 
235

 
—

 
337

Weighted average number of common shares used in diluted net income (loss) per common share
41,688

 
41,475

 
41,595

 
41,472

Net income (loss) per common share:
 
 
 
 
 
 
 
Basic
$
(1.53
)
 
$
0.42

 
$
(1.36
)
 
$
0.56

Diluted
$
(1.53
)
 
$
0.42

 
$
(1.36
)
 
$
0.55

 
 
 
 
 
 
 
 
Anti-dilutive shares
527

 
106

 
446

 
189


Basic net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of common shares and potential common shares outstanding during the period. Potential common shares include the dilutive effects of vested and 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 primarily include non-vested restricted stock, and performance share units for which the sum of the assumed proceeds, including unrecognized compensation expense, exceeds the average stock price during the periods presented.