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Basis of Presentation and Significant Accounting Policies (Tables)
3 Months Ended
Apr. 02, 2016
Fair Value Disclosures [Abstract]  
Fair Value, Assets And Liabilities

The following table represents the Company's assets and liabilities measured at fair value on a recurring basis at April 2, 2016 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
       for Identical Observable Unobservable
    Total at  Assets Inputs Inputs
    April 2, 2016 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 608,537 $ - $ 608,537 $ -
 Foreign government securities   27,011   -   27,011   -
 Corporate debt securities   1,433,296   -   1,433,296   -
 Time deposits   106,408   -   106,408   -
 Equity securities   147   -   147   -
 Other cash equivalents   27,000   -   27,000   -
 Waters 401(k) Restoration Plan assets   30,014   -   30,014   -
 Foreign currency exchange contracts   814   -   814   -
  Total $ 2,233,227 $ - $ 2,233,227 $ -
               
Liabilities:            
 Contingent consideration $ 4,412 $ - $ - $ 4,412
 Foreign currency exchange contracts   628   -   628   -
  Total $ 5,040 $ - $ 628 $ 4,412

The following table represents the Company's assets and liabilities measured at fair value on a recurring basis at December 31, 2015 (in thousands):

       Quoted Prices      
       in Active Significant   
       Markets Other Significant
    Total at for Identical Observable Unobservable
    December 31,  Assets Inputs Inputs
    2015 (Level 1) (Level 2) (Level 3)
Assets:            
 U.S. Treasury securities $ 627,156 $ - $ 627,156 $ -
 Foreign government securities   15,199   -   15,199   -
 Corporate debt securities   1,324,318   -   1,324,318   -
 Time deposits   74,947   -   74,947   -
 Equity securities   147   -   147   -
 Other cash equivalents   27,000   -   27,000   -
 Waters 401(k) Restoration Plan assets   35,823   -   35,823   -
 Foreign currency exchange contracts   616   -   616   -
  Total $ 2,105,206 $ - $ 2,105,206 $ -
               
Liabilities:            
 Contingent consideration $ 4,215 $ - $ - $ 4,215
 Foreign currency exchange contracts   402   -   402   -
  Total $ 4,617 $ - $ 402 $ 4,215
Summary of Derivative Instruments by Risk Exposure [Abstract]  
Gains (Losses) on Foreign Exchange Contracts

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

  Three Months Ended
  April 2, 2016 April 4, 2015
Realized losses on closed contracts $ (1,895) $ (3,348)
Unrealized (losses) gains on open contracts   (28)   342
Cumulative net pre-tax losses $ (1,923) $ (3,006)
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 2, 2016 December 31, 2015
Other current assets $814 $616
Other current liabilities $628 $402
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 2, 2016 and April 4, 2015 (in thousands):

  Balance at     Balance at
  Beginning Accruals for Settlements End of
  of Period Warranties Made Period
Accrued warranty liability:            
April 2, 2016 $ 13,349 $ 1,681 $ (2,198) $ 12,832
April 4, 2015 $ 13,266 $ 1,762 $ (2,157) $ 12,871