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Basis of Presentation and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 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 six months ended June 30, 2018 and July 1, 2017 (in thousands):

		Balance at Beginning of Period				Additions				Deduction				Balance at End of Period
Allowance for Doubtful Accounts
June 30, 2018		$	6,109			$	1,825			$	(1,778	)		$	6,156
July 1, 2017		$	5,140			$	1,571			$	(1,228	)		$	5,483

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 June 30, 2018 (in thousands):

		Total at June 30, 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		$	237,759			$	—			$	237,759			$	—
Foreign government securities			2,954				—				2,954				—
Corporate debt securities			1,198,549				—				1,198,549				—
Time deposits			238,314				—				238,314				—
Equity securities			147				—				147				—
Waters 401(k) Restoration Plan assets			36,309				36,309				—				—
Foreign currency exchange contracts			167				—				167				—
Total		$	1,714,199			$	36,309			$	1,677,890			$	—
Liabilities:
Contingent consideration		$	3,550			$	—			$	—			$	3,550
Foreign currency exchange contracts			875				—				875				—
Total		$	4,425			$	—			$	875			$	3,550

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):

		June 30, 2018				December 31, 2017
Other current assets		$	167			$	566
Other current liabilities		$	875			$	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								Six Months Ended
		June 30, 2018				July 1, 2017				June 30, 2018				July 1, 2017
Realized (losses) gains on closed contracts		$	(4,096	)		$	1,868			$	(2,158	)		$	430
Unrealized (losses) gains on open contracts			(105	)			2,209				(1,092	)			2,077
Cumulative net pre-tax (losses) gains		$	(4,201	)		$	4,077			$	(3,250	)		$	2,507

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 six months ended June 30, 2018 and July 1, 2017 (in thousands):

		Balance at Beginning of Period				Accruals for Warranties				Settlements Made				Balance at End of Period
Accrued warranty liability:
June 30, 2018		$	13,026			$	3,588			$	(4,115	)		$	12,499
July 1, 2017		$	13,391			$	3,842			$	(4,369	)		$	12,864

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