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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Allowance for Doubtful Accounts Roll Forward

The following is a summary of the activity of the Company’s allowance for doubtful accounts for the three months ended March 31, 2018 and April 1, 2017 (in thousands):

 

     Balance at
Beginning
of Period		      Additions      Deduction      Balance at
End of
Period		  
             
             

Allowance for Doubtful Accounts

            

March 31, 2018

    $ 6,109      $ 1,056      $ (1,033 )     $ 6,132  

April 1, 2017

    $ 5,140      $ 636      $ (643 )     $ 5,133  
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis at March 31, 2018 (in thousands):

 

     Total at
March 31,
2018		      Quoted Prices
in Active
Markets
for Identical
Assets
(Level 1)		      Significant
Other
Observable
Inputs
(Level 2)		      Significant
Unobservable
Inputs
(Level 3)		  

Assets:

            

U.S. Treasury securities

    $ 425,032      $ —        $ 425,032      $ —    

Foreign government securities

      6,947        —          6,947        —    

Corporate debt securities

      1,292,878        —          1,292,878        —    

Time deposits

      301,277        —          301,277        —    

Equity securities

      147        —          147        —    

Waters 401(k) Restoration Plan assets

      35,762        35,762        —          —    

Foreign currency exchange contracts

      129        —          129        —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 2,062,172      $ 35,762      $ 2,026,410      $ —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Liabilities:

            

Contingent consideration

    $ 3,399      $ —        $ —        $ 3,399  

Foreign currency exchange contracts

      730        —          730        —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 4,129      $ —        $ 730      $ 3,399  
  

 

 

     

 

 

     

 

 

     

 

 

  

The following table represents the Company’s assets and liabilities measured at fair value on a recurring basis at December 31, 2017 (in thousands):

 

     Total at
December 31,
2017		      Quoted Prices
in Active
Markets
for Identical
Assets
(Level 1)		      Significant
Other
Observable
Inputs
(Level 2)		      Significant
Unobservable
Inputs
(Level 3)		  

Assets:

            

U.S. Treasury securities

    $ 591,988      $ —        $ 591,988      $ —    

Foreign government securities

      6,952        —          6,952        —    

Corporate debt securities

      1,975,160        —          1,975,160        —    

Time deposits

      371,511        —          371,511        —    

Equity securities

      147        —          147        —    

Waters 401(k) Restoration Plan assets

      35,645        35,645        —          —    

Foreign currency exchange contracts

      566        —          566        —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 2,981,969      $ 35,645      $ 2,946,324      $ —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Liabilities:

            

Contingent consideration

    $ 3,247      $ —        $ —        $ 3,247  

Foreign currency exchange contracts

      182        —          182        —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 3,429      $ —        $ 182      $ 3,247  
  

 

 

     

 

 

     

 

 

     

 

 

  
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):

 

     March 31, 2018      December 31, 2017  

Other current assets

    $ 129      $ 566  

Other current liabilities

    $ 730      $ 182  
Gains (Losses) on Foreign Exchange Contracts

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

 

     Three Months Ended  
     March 31, 2018      April 1, 2017  

Realized gains (losses) on closed contracts

    $ 1,937      $ (1,438 ) 

Unrealized losses on open contracts

      (985 )       (132 ) 
  

 

 

     

 

 

  

Cumulative net pre-tax gains (losses)

    $ 952      $ (1,570 ) 
  

 

 

     

 

 

  
Summary of Activity of Company's Accrued Warranty Liability

The following is a summary of the activity of the Company’s accrued warranty liability for the three months ended March 31, 2018 and April 1, 2017 (in thousands):

 

     Balance at
Beginning
of Period		      Accruals for
Warranties		      Settlements
Made		      Balance at
End of
Period		  

Accrued warranty liability:

            

March 31, 2018

    $ 13,026      $ 1,767      $ (2,167 )     $ 12,626  

April 1, 2017

    $ 13,391      $ 1,815      $ (2,208 )     $ 12,998