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Stock-Based Compensation (Tables)
9 Months Ended
Oct. 01, 2011
Equity Instruments Other Than Options Nonvested Roll Forward [Abstract] 
Restricted Stock Units Unvested Roll Forward

The following table summarizes the unvested restricted stock unit award activity for the nine months ended October 1, 2011 (in thousands, except for per share amounts):

   Shares Weighted-Average Price
Unvested at December 31, 2010 752 $49.64
 Granted 175 $78.99
 Vested (250) $48.16
 Forfeited (11) $53.13
Unvested at October 1, 2011  666 $57.85
Stock Option Fair Value Assumptions and Methodology [Abstract] 
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 1, 2011 and October 2, 2010 are as follows:

Options Issued and Significant Assumptions Used to Estimate Option Fair Values October 1, 2011 October 2, 2010
Options issued in thousands 32 32
Risk-free interest rate 2.1% 3.0%
Expected life in years 6 6
Expected volatility 0.290 0.293
Expected dividends  -  -

Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant October 1, 2011 October 2, 2010
Exercise price $ 78.10 $ 61.63
Fair value $ 25.25 $ 21.40
Stock Options Outstanding Roll Forward [Abstract] 
Stock Options Outstanding Roll Forward

The following table summarizes stock option activity for the plans for the nine months ended October 1, 2011 (in thousands, except per share data):

    Number of Shares Price per Share Weighted-Average Exercise Price
Outstanding at December 31, 2010 5,560 $21.39to$80.97 $50.19
 Granted 32  $78.10 $78.10
 Exercised (1,045) $21.39to$77.94 $40.95
 Canceled (24) $36.25to$80.97 $80.87
Outstanding at October 1, 2011 4,523 $21.39to$79.05 $52.36
Stock-Based Compensation Allocation and Classification in Financial Statements [Abstract] 
Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the nine months ended October 1, 2011 and October 2, 2010 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 1, 2011 October 2, 2010 October 1, 2011 October 2, 2010
Cost of sales $ 587 $ 623 $ 1,912 $ 1,852
Selling and administrative expenses   5,654   4,829   16,392   14,364
Research and development expenses   641   792   2,341   2,342
 Total stock-based compensation $ 6,882 $ 6,244 $ 20,645 $ 18,558