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Nature of Operations and Summary of Significant Accounting Policies - Revenue Recognition by Product Line, Product Type and Revenue Recognition Method (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 149,193	$ 102,857
Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	142,005
Over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,188
North America [Member]
Disaggregation of Revenue [Line Items]
Revenues	77,616	50,166
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenues	41,493	32,751
Asia [Member]
Disaggregation of Revenue [Line Items]
Revenues	20,148	11,898
Rest of World [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,936	8,042
Fiber based Products [Member]
Disaggregation of Revenue [Line Items]
Revenues	4,461	4,364
Parts and Consumables [Member]
Disaggregation of Revenue [Line Items]
Revenues	95,985	70,444
Capital [Member]
Disaggregation of Revenue [Line Items]
Revenues	53,208	32,413
Papermaking Systems [Member]
Disaggregation of Revenue [Line Items]
Revenues	105,591	88,550
Papermaking Systems [Member] | Stock preparation [Member]
Disaggregation of Revenue [Line Items]
Revenues	45,483	41,153
Papermaking Systems [Member] | Doctoring, Cleaning and Filtration [Member]
Disaggregation of Revenue [Line Items]
Revenues	27,222	25,350
Papermaking Systems [Member] | Fluid handling [Member]
Disaggregation of Revenue [Line Items]
Revenues	32,886	22,047
Wood Processing Systems Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 39,141	$ 9,943

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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