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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Deferred Revenue and Customer Advances by Arrangement

A rollforward of the Company’s deferred revenue and customer advances is as follows:

		Year Ended December 31, 2018
Beginning balance, January 1(1)		$	27,800
Amount of deferred revenue and customer advances recognized in income(3)			(83,497	)
Additions to deferred revenue and customer advances			73,171
Ending balance, December 31(2)		$	17,474

(1) Beginning deferred revenue and customer advances as of January 1, 2018 included $12,842 of current deferred revenue, $3,126 of long-term deferred revenue and $13,352 of current customer advances, net of a $1,520 adjustment related to the adoption of ASC 606.

(2) Ending deferred revenue and customer advances as of December 31, 2018 included $8,134 of current deferred revenue, $3,228 of long-term deferred revenue and $6,112 of current customer advances.

(3) The deferred revenue and customers advances recognized in income that relates to fiscal year 2018 was $61,012.

Summary of Revenue from Contracts with Customers

The following table summarizes revenue from contracts with customers:

		Year Ended December 31, 2018
		Vacuum & Analysis				Light & Motion				Total
Net revenues:
Products		$	1,080,343			$	754,859			$	1,835,202
Services			180,519				59,387				239,906
Total net revenues		$	1,260,862			$	814,246			$	2,075,108

		Year Ended December 31, 2017
		Vacuum & Analysis				Light & Motion				Total
Net revenues:
Products		$	1,047,639			$	653,662			$	1,701,301
Services			159,818				54,858				214,676
Total net revenues		$	1,207,457			$	708,520			$	1,915,977

		Year Ended December 31, 2016
		Vacuum  & Analysis				Light & Motion				Total
Net revenues:
Products		$	731,364			$	387,215			$	1,118,579
Services			140,927				35,836				176,763
Total net revenues		$	872,291			$	423,051			$	1,295,342

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Tabular disclosure of contract balances and changes in contract balances.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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