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Stock-Based Compensation (Tables)
6 Months Ended
Jul. 04, 2015
Stock-Based Compensation [Abstract]  
Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the three and six months ended July 4, 2015 and June 28, 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 Six Months Ended
   July 4, 2015 June 28, 2014 July 4, 2015 June 28, 2014
Cost of sales $ 648 $ 672 $ 1,322 $ 1,428
Selling and administrative expenses   6,426   6,555   13,060   12,990
Research and development expenses   1,081   997   2,228   1,935
 Total stock-based compensation $ 8,155 $ 8,224 $ 16,610 $ 16,353
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 July 4, 2015 and June 28, 2014 are as follows:

  Six Months Ended
Options Issued and Significant Assumptions Used to Estimate Option Fair Values July 4, 2015 June 28, 2014
Options issued in thousands 37 32
Risk-free interest rate 1.7% 1.9%
Expected life in years 4 4
Expected volatility 0.262 0.245
Expected dividends  -  -

  Six Months Ended
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant July 4, 2015 June 28, 2014
Exercise price $ 116.65 $ 99.22
Fair value $ 28.17 $ 22.38
Stock Options Outstanding Roll Forward

The following table summarizes stock option activity for the plans for the six months ended July 4, 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 37 $113.88to$134.37 $116.65
 Exercised (296) $37.84to$98.21 $74.33
 Canceled (72) $79.05to$87.06 $83.25
Outstanding at July 4, 2015 2,949 $38.09to$134.37 $84.12
Restricted Stock Units Unvested Roll Forward

The following table summarizes the unvested restricted stock unit award activity for the six months ended July 4, 2015 (in thousands, except for per share amounts):

   Shares Weighted-Average Price
Unvested at December 31, 2014 533 $94.38
 Granted 130 $118.83
 Vested (143) $85.34
 Forfeited (8) $99.68
Unvested at July 4, 2015  512 $103.03