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Stock-Based Compensation (Tables)
 6 Months Ended
Jul. 02, 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 six months ended July 2, 2011 (in thousands, except for per share amounts):

   Shares Weighted-Average Price
Unvested at December 31, 2010 752 $49.64
 Granted 173 $79.00
 Vested (250) $48.12
 Forfeited (7) $51.79
Unvested at July 2, 2011  668 $57.79
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 six months ended July 2, 2011 and July 3, 2010 are as follows:

Options Issued and Significant Assumptions Used to Estimate Option Fair Values July 2, 2011 July 3, 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 July 2, 2011 July 3, 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 six months ended July 2, 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 (996) $21.39to$77.94 $40.98
 Canceled (24) $36.25to$80.97 $80.87
Outstanding at July 2, 2011 4,572 $21.39to$79.05 $52.23
Stock-Based Compensation Allocation and Classification in Financial Statements [Abstract]  
Schedule of Stock-Based Compensation Expense

The consolidated statements of operations for the six months ended July 2, 2011 and July 3, 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 Six Months Ended
   July 2, 2011 July 3, 2010 July 2, 2011 July 3, 2010
Cost of sales $ 629 $ 604 $ 1,325 $ 1,229
Selling and administrative expenses   5,272   4,878   10,738   9,535
Research and development expenses   847   801   1,700   1,550
 Total stock-based compensation $ 6,748 $ 6,283 $ 13,763 $ 12,314