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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. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 154,913	$ 110,242	$ 304,106	$ 213,099
Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	145,998		288,003
Over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	8,915		16,103
North America [Member]
Disaggregation of Revenue [Line Items]
Revenues	75,375	51,557	152,991	101,723
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenues	45,032	33,952	86,525	66,703
Asia [Member]
Disaggregation of Revenue [Line Items]
Revenues	25,502	16,545	45,650	28,443
Rest of World [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,004	8,188	18,940	16,230
Parts and Consumables [Member]
Disaggregation of Revenue [Line Items]
Revenues	94,857	70,040	190,842	140,484
Capital [Member]
Disaggregation of Revenue [Line Items]
Revenues	60,056	40,202	113,264	72,615
Operating Segment [Member] | Papermaking Systems [Member]
Disaggregation of Revenue [Line Items]
Revenues	118,450	95,731	224,041	184,281
Operating Segment [Member] | Papermaking Systems [Member] | Stock preparation [Member]
Disaggregation of Revenue [Line Items]
Revenues	56,376	46,178	101,859	87,331
Operating Segment [Member] | Papermaking Systems [Member] | Doctoring, Cleaning and Filtration [Member]
Disaggregation of Revenue [Line Items]
Revenues	29,543	27,033	56,765	52,383
Operating Segment [Member] | Papermaking Systems [Member] | Fluid handling [Member]
Disaggregation of Revenue [Line Items]
Revenues	32,531	22,520	65,417	44,567
Operating Segment [Member] | Wood Processing Systems Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	33,152	11,393	72,293	21,336
Corporate And Reconciling Items [Member] | Fiber based Products [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 3,311	$ 3,118	$ 7,772	$ 7,482

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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
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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