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Nature of Operations and Summary of Significant Accounting Policies - Revenue Recognition by Product Line, Product Type, Geography and Revenue Recognition Method (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 173,504	$ 165,745	$ 521,985	$ 469,851
Point in Time
Disaggregation of Revenue [Line Items]
Revenues	151,101	148,524	457,093	436,527
Over Time
Disaggregation of Revenue [Line Items]
Revenues	22,403	17,221	64,892	33,324
North America
Disaggregation of Revenue [Line Items]
Revenues	92,041	74,089	291,584	227,080
Europe
Disaggregation of Revenue [Line Items]
Revenues	49,146	44,912	131,944	131,437
Asia
Disaggregation of Revenue [Line Items]
Revenues	20,971	32,887	61,745	78,537
Rest of World
Disaggregation of Revenue [Line Items]
Revenues	11,346	13,857	36,712	32,797
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues	105,513	92,749	330,280	283,591
Capital
Disaggregation of Revenue [Line Items]
Revenues	$ 67,991	$ 72,996	$ 191,705	$ 186,260

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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