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Fair Value Measurements (Tables)
3 Months Ended
Apr. 01, 2012
Fair Value Measurements [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
                     
    Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
  Significant Other
Observable

Inputs (Level 2)

Assets:

                   

Money market instruments

    $ 1,735       $  

Corporate bonds

              133,486  

Municipal bonds

              125,394  

Agency bonds

              41,285  

Sovereign bonds

              24,501  

Covered bonds

              6,183  

Asset-backed securities

              5,393  

Treasury bills

              999  

Currency forward contracts

      10          
     

Liabilities:

                   

Currency forward contracts

      28