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Stock-Based Compensation (Tables)
9 Months Ended
Oct. 03, 2015
Stock-Based Compensation [Abstract]  
Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the three and nine months ended October 3, 2015 and September 27, 2014 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 Nine Months Ended
   October 3, 2015 September 27, 2014 October 3, 2015 September 27, 2014
Cost of sales $ 668 $ 633 $ 1,990 $ 2,061
Selling and administrative expenses   6,626   6,355   19,686   19,345
Research and development expenses   1,053   1,119   3,281   3,054
 Total stock-based compensation $ 8,347 $ 8,107 $ 24,957 $ 24,460
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 nine months ended October 3, 2015 and September 27, 2014 are as follows:

  Nine Months Ended
Options Issued and Significant Assumptions Used to Estimate Option Fair Values October 3, 2015 September 27, 2014
Options issued in thousands 115 32
Risk-free interest rate 1.4% 1.9%
Expected life in years 4 4
Expected volatility 0.291 0.245
Expected dividends  -  -

  Nine Months Ended
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant October 3, 2015 September 27, 2014
Exercise price $ 121.33 $ 99.22
Fair value $ 30.85 $ 22.38
Stock Options Outstanding Roll Forward

The following table summarizes stock option activity for the plans for the nine months ended October 3, 2015 (in thousands, except per share data):

    Number of Shares Price per Share Weighted-Average Exercise Price
Outstanding at December 31, 2014 3,280 $37.84to$113.36 $82.85
 Granted 115 $113.88to$134.37 $121.33
 Exercised (342) $37.84to$98.21 $74.44
 Canceled (72) $79.05to$87.06 $83.25
Outstanding at October 3, 2015 2,981 $38.09to$134.37 $85.29
Restricted Stock Units Unvested Roll Forward

The following table summarizes the unvested restricted stock unit award activity for the nine months ended October 3, 2015 (in thousands, except for per share amounts):

   Shares Weighted-Average Price
Unvested at December 31, 2014 533 $94.38
 Granted 150 $119.46
 Vested (144) $85.40
 Forfeited (12) $99.75
Unvested at October 3, 2015  527 $103.85