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Business Combinations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	May 26, 2017
Ultratech
Business Combinations
Cash received by acquiree (in dollars per share)			$ 21.75
Number of shares received by acquiree			0.2675
Accrued Expenses and Other Current Liabilities
Business Combinations
Cash consideration, net of cash acquired of $229.4 million	$ 2.7	$ 2.7

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+ References

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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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- Definition

The number of shares received as consideration for each share of acquiree entity under business combination agreement.

+ References

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