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NET INCOME PER SHARE | 9 Months Ended
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Sep. 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):
| Thirteen weeks ended |  | Thirty-nine weeks ended
| September 26, 2014 |  | September 27, 2013 |  | September 26, 2014 |  | September 27, 2013
Net income | $ | 20,910 |  |  | $ | 18,952 |  |  | $ | 38,650 |  |  | $ | 30,412 |
Weighted average number of common shares used in basic net income per common share | 40,793 |  |  | 40,330 |  |  | 40,701 |  |  | 40,085 |
Dilutive effect of outstanding stock options and non-vested restricted stock | 245 |  |  | 340 |  |  | 270 |  |  | 310 |
Weighted average number of common shares used in diluted net income per common share | 41,038 |  |  | 40,670 |  |  | 40,971 |  |  | 40,395 |
Net income per common share: |  |  |  |  |  |  |
Basic | $ | 0.51 |  |  | $ | 0.47 |  |  | $ | 0.95 |  |  | $ | 0.76 |
Diluted | $ | 0.51 |  |  | $ | 0.47 |  |  | $ | 0.94 |  |  | $ | 0.75 |
Anti-dilutive shares | 97 |  |  | — |  |  | 35 |  |  | — |
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, and performance share units, 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.

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