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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 29, 2013
Stock Option
 
Schedule of Estimated Fair Value of Stock Options Assumptions

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

 

     For the Nine Months
Ended
 
     September 29,
2013
    September 30,
2012
 

Expected life (years)

     4.0        3.5   

Interest rate

     0.6     0.4

Volatility-historical

     46.8     56.0

Dividend yield

     0.0     0.0
Stock Purchase Rights
 
Schedule of Estimated Fair Value of Stock Options Assumptions

The fair value of the employees’ purchase rights granted in the nine months ended September 30, 2012 was estimated using the Black-Scholes option-pricing model with the following assumptions:

 

     For the Nine Months Ended
September 30,
2012
 

Expected life (years)

     0.5   

Interest rate

     0.11

Volatility-historical

     42.7

Dividend yield

     0.0