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Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands	6 Months Ended
	Jul. 01, 2017 USD ($)
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	$ 236,964
Accumulated impairment losses	(85,509)
Net Balance, Beginning Balance	151,455
Currency Translation	7,372
Total 2017 Adjustments	7,372
Gross Balance, Ending Balance	244,336
Accumulated impairment losses	(85,509)
Net Balance, Ending Balance	158,827
Operating Segment [Member] | Papermaking Systems [Member]
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	219,699
Accumulated impairment losses	(85,509)
Net Balance, Beginning Balance	134,190
Currency Translation	6,704
Total 2017 Adjustments	6,704
Gross Balance, Ending Balance	226,403
Accumulated impairment losses	(85,509)
Net Balance, Ending Balance	140,894
Operating Segment [Member] | Wood Processing Systems [Member]
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	17,265
Accumulated impairment losses	0
Net Balance, Beginning Balance	17,265
Currency Translation	668
Total 2017 Adjustments	668
Gross Balance, Ending Balance	17,933
Accumulated impairment losses	0
Net Balance, Ending Balance	$ 17,933

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a,h)
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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a,h)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 350
-SubTopic 20
-Section 50
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