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NET INCOME (LOSS) PER SHARE | 9 Months Ended
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Sep. 23, 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 |  | Thirty-nine weeks ended
| September 23, 2016 |  | September 25, 2015 |  | September 23, 2016 |  | September 25, 2015
Net income (loss) | $ | 23,429 |  |  | $ | 20,090 |  |  | $ | (33,338 | ) |  | $ | 43,079 |
Weighted average number of common shares used in basic net income (loss) per common share | 41,762 |  |  | 41,296 |  |  | 41,651 |  |  | 41,189 |
Dilutive effect of non-vested restricted stock | 294 |  |  | 324 |  |  | — |  |  | 357 |
Weighted average number of common shares used in diluted net income (loss) per common share | 42,056 |  |  | 41,620 |  |  | 41,651 |  |  | 41,546 |
Net income (loss) per common share: |  |  |  |  |  |  |
Basic | $ | 0.56 |  |  | $ | 0.49 |  |  | $ | (0.80 | ) |  | $ | 1.05 |
Diluted | $ | 0.56 |  |  | $ | 0.48 |  |  | $ | (0.80 | ) |  | $ | 1.04 |
Anti-dilutive shares | 302 |  |  | 91 |  |  | 521 |  |  | 227 |
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.

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