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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 28, 2014
Stock-Based Compensation [Abstract]  
Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the three and six months ended June 28, 2014 and June 29, 2013 include the following stock-based compensation expense related to stock option awards, restricted stock, restricted stock unit awards and the employee stock purchase plan (in thousands):

   Three Months Ended Six Months Ended
   June 28, 2014 June 29, 2013 June 28, 2014 June 29, 2013
Cost of sales $ 672 $ 657 $ 1,428 $ 1,325
Selling and administrative expenses   6,555   6,215   12,990   11,971
Research and development expenses   997   1,004   1,935   2,011
 Total stock-based compensation $ 8,224 $ 7,876 $ 16,353 $ 15,307
Relevant Data Used to Determine the Value of Stock Options Granted During the Period

The relevant data used to determine the value of the stock options granted during the six months ended June 28, 2014 and June 29, 2013 are as follows:

Options Issued and Significant Assumptions Used to Estimate Option Fair Values June 28, 2014 June 29, 2013
Options issued in thousands 32 32
Risk-free interest rate 1.9% 1.0%
Expected life in years 4 5
Expected volatility 0.245 0.260
Expected dividends  -  -

Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant June 28, 2014 June 29, 2013
Exercise price $ 99.22 $ 88.71
Fair value $ 22.38 $ 22.03
Stock Options Outstanding Roll Forward

The following table summarizes stock option activity for the plans for the six months ended June 28, 2014 (in thousands, except per share data):

    Number of Shares Price per Share Weighted-Average Exercise Price
Outstanding at December 31, 2013 3,917 $33.12to$103.47 $71.08
 Granted 32  $99.22 $99.22
 Exercised (632) $33.12to$87.06 $60.26
 Canceled (21) $79.15to$98.21 $88.02
Outstanding at June 28, 2014 3,296 $37.84to$103.47 $73.32
Restricted Stock Units Unvested Roll Forward

The following table summarizes the unvested restricted stock unit award activity for the six months ended June 28, 2014 (in thousands, except for per share amounts):

   Shares Weighted-Average Price
Unvested at December 31, 2013 642 $82.16
 Granted 134 $112.59
 Vested (190) $66.26
 Forfeited (14) $83.80
Unvested at June 28, 2014  572 $94.53