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Basis of Presentation and Significant Accounting Policies (Tables)
3 Months Ended
Apr. 04, 2015
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Abstract]  
Fair Value of Assets and Liabilities Measured on a Recurring Basis

The following table represents the Company's assets and liabilities measured at fair value on a recurring basis at April 4, 2015 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
       for Identical Observable Unobservable
    Total at  Assets Inputs Inputs
    April 4, 2015 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 641,693 $ - $ 641,693 $ -
 Foreign government securities   24,994   -   24,994   -
 Corporate debt securities   1,067,736   -   1,067,736   -
 Time deposits   64,265   -   64,265   -
 Equity securities   147   -   147   -
 Other cash equivalents   29,000   -   29,000   -
 Waters 401(k) Restoration Plan assets   35,678   -   35,678   -
 Foreign currency exchange contracts   445   -   445   -
  Total $ 1,863,958 $ - $ 1,863,958 $ -
               
Liabilities:            
 Contingent consideration $ 3,780 $ - $ - $ 3,780
 Foreign currency exchange contracts   631   -   631   -
  Total $ 4,411 $ - $ 631 $ 3,780

The following table represents the Company's assets and liabilities measured at fair value on a recurring basis at December 31, 2014 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
    Total at for Identical Observable Unobservable
    December 31,  Assets Inputs Inputs
    2014 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 626,772 $ - $ 626,772 $ -
 Foreign government securities   24,998   -   24,998   -
 Corporate debt securities   984,105   -   984,105   -
 Time deposits   64,240   -   64,240   -
 Equity securities   147   -   147   -
 Other cash equivalents   29,000   -   29,000   -
 Waters 401(k) Restoration Plan assets   33,935   -   33,935   -
 Foreign currency exchange contracts   123   -   123   -
  Total $ 1,763,320 $ - $ 1,763,320 $ -
               
Liabilities:            
 Contingent consideration $ 3,612 $ - $ - $ 3,612
 Foreign currency exchange contracts   651   -   651   -
  Total $ 4,263 $ - $ 651 $ 3,612
Summary of Derivative Instruments by Risk Exposure [Abstract]  
Gains (Losses) on Foreign Currency Exchange Contracts

The following is a summary of the activity in cost of sales in the statements of operations related to the forward foreign exchange contracts (in thousands):

  Three Months Ended
  April 4, 2015 March 29, 2014
Realized losses on closed contracts $ (3,348) $ (314)
Unrealized gains (losses) on open contracts   342   (881)
Cumulative net pre-tax losses $ (3,006) $ (1,195)
Fair Value of Forward Foreign Exchange Contracts

The Company's foreign currency exchange contracts included in the consolidated balance sheets are classified as follows (in thousands):

   April 4, 2015 December 31, 2014
Other current assets $445 $123
Other current liabilities $631 $651
Warranty Accrual Roll Forward [Abstract]  
Warranty Accrual Roll Forward

The following is a summary of the activity of the Company's accrued warranty liability for the three months ended April 4, 2015 and March 29, 2014 (in thousands):

  Balance at     Balance at
  Beginning Accruals for Settlements End of
  of Period Warranties Made Period
Accrued warranty liability:            
April 4, 2015 $ 13,266 $ 1,762 $ (2,157) $ 12,871
March 29, 2014 $ 12,962 $ 1,752 $ (1,919) $ 12,795