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Net Income Per Share | 12 Months Ended
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Dec. 31, 2013
Net Income Per Share [Abstract] |
Earnings Per Share [Text Block] | Net Income Per Share Basic net income per share is computed by dividing net income for the period by the weighted average number of shares outstanding during the period, less shares subject to repurchase. Diluted net income per share is computed by dividing net income for the period by the weighted average number of shares, less shares subject to repurchase, plus, if dilutive, potential common stock outstanding during the period. Potential common stock includes the effect of outstanding dilutive stock options, restricted stock awards and restricted stock units computed using the treasury stock method. Since their impact is anti-dilutive, the total number of shares excluded from the calculations of diluted net income per share for the years ended December 31, 2013, 2012 and 2011 were 850,133, 2,149,044 and 1,833,574 shares, respectively. The calculation of basic and diluted net income per share is as follows (in thousands, except per share amounts):
| Years Ended December 31 |
| 2013 |  | 2012 |  | 2011 |
Basic: |  |  |  |  |  |  |  |  |
Net income | $ | 23,979 |  |  | $ | 16,178 |  |  | $ | 10,389 |  |
Weighted average shares outstanding — basic | 34,736 |  |  | 33,307 |  |  | 33,123 |  |
Net income per share — basic | $ | 0.69 |  |  | $ | 0.49 |  |  | $ | 0.31 |  |
Diluted: |  |  |  |  |  |  |  |  |
Net income | $ | 23,979 |  |  | $ | 16,178 |  |  | $ | 10,389 |  |
Weighted average shares outstanding — basic | 34,736 |  |  | 33,307 |  |  | 33,123 |  |
Add: Dilutive effect of employee stock plans | 1,041 |  |  | 906 |  |  | 980 |  |
Weighted average shares outstanding — diluted | 35,777 |  |  | 34,213 |  |  | 34,103 |  |
Net income per share — diluted | $ | 0.67 |  |  | $ | 0.47 |  |  | $ | 0.30 |  |

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