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Fair Value Measurements (Tables)
 6 Months Ended
Jul. 03, 2011
Fair Value Measurements [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
                   
    Quoted Prices in    
    Active Markets   Significant Other
    for Identical   Observable
    Assets (Level 1)   Inputs (Level 2)
Assets:
               
Money market instruments
  $    2,452     $    -  
Treasury bills
    -       25,215  
Municipal bonds
    -       118,703  
Corporate bonds
    -       105,744  
Agency bonds
    -       38,416  
Sovereign bonds
    -       21,531  
Covered bonds
    -       6,715  
Currency forward contracts
    209       -  
 
               
Liabilities:
               
Currency forward contracts
    13       -