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Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details) $ in Thousands	3 Months Ended
	Apr. 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	2,356
Total 2017 Adjustments	2,356
Gross Balance, Ending Balance	239,320
Accumulated impairment losses	(85,509)
Net Balance, Ending Balance	153,811
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	2,092
Total 2017 Adjustments	2,092
Gross Balance, Ending Balance	221,791
Accumulated impairment losses	(85,509)
Net Balance, Ending Balance	136,282
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	264
Total 2017 Adjustments	264
Gross Balance, Ending Balance	17,529
Accumulated impairment losses	0
Net Balance, Ending Balance	$ 17,529

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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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 350
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