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Basis of Presentation and Significant Accounting Policies (Tables)
9 Months Ended
Oct. 03, 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 October 3, 2015 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
       for Identical Observable Unobservable
    Total at  Assets Inputs Inputs
    October 3, 2015 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 629,048 $ - $ 629,048 $ -
 Corporate debt securities   1,233,772   -   1,233,772   -
 Time deposits   80,931   -   80,931   -
 Equity securities   147   -   147   -
 Other cash equivalents   29,000   -   29,000   -
 Waters 401(k) Restoration Plan assets   33,842   -   33,842   -
 Foreign currency exchange contracts   38   -   38   -
  Total $ 2,006,778 $ - $ 2,006,778 $ -
               
Liabilities:            
 Contingent consideration $ 4,116 $ - $ - $ 4,116
 Foreign currency exchange contracts   575   -   575   -
  Total $ 4,691 $ - $ 575 $ 4,116

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 Nine Months Ended
  October 3, 2015 September 27, 2014 October 3, 2015 September 27, 2014
Realized gains (losses) on closed contracts $ 810 $ (266) $ 5 $ (366)
Unrealized losses on open contracts   (71)   (43)   (9)   (1,000)
Cumulative net pre-tax gains (losses) $ 739 $ (309) $ (4) $ (1,366)
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):

   October 3, 2015 December 31, 2014
Other current assets $38 $123
Other current liabilities $575 $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 nine months ended October 3, 2015 and September 27, 2014 (in thousands):

  Balance at     Balance at
  Beginning Accruals for Settlements End of
  of Period Warranties Made Period
Accrued warranty liability:            
October 3, 2015 $ 13,266 $ 5,834 $ (5,993) $ 13,107
September 27, 2014 $ 12,962 $ 5,292 $ (5,773) $ 12,481