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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		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 177,165	$ 154,913	$ 348,481	$ 304,106
Point in Time
Disaggregation of Revenue [Line Items]
Revenues	157,716	145,998	305,992	288,003
Over Time
Disaggregation of Revenue [Line Items]
Revenues	19,449	8,915	42,489	16,103
North America
Disaggregation of Revenue [Line Items]
Revenues	98,667	75,375	199,543	152,991
Europe
Disaggregation of Revenue [Line Items]
Revenues	43,813	45,032	82,798	86,525
Asia
Disaggregation of Revenue [Line Items]
Revenues	23,696	25,502	40,774	45,650
Rest of World
Disaggregation of Revenue [Line Items]
Revenues	10,989	9,004	25,366	18,940
Parts and Consumables
Disaggregation of Revenue [Line Items]
Revenues	111,917	94,857	224,767	190,842
Capital
Disaggregation of Revenue [Line Items]
Revenues	$ 65,248	$ 60,056	$ 123,714	$ 113,264

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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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