Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2019
Goodwill [Roll Forward]
Balance at beginning of period		$ 196,963
Currency translation adjustments		(688)
Reductions		(662)
Balance at end of period	$ 195,613	195,613
Performance Materials
Goodwill [Roll Forward]
Balance at beginning of period		144,626
Currency translation adjustments		(485)
Reductions	(700)	(662)
Balance at end of period	143,479	143,479
Technical Nonwovens
Goodwill [Roll Forward]
Balance at beginning of period		52,337
Currency translation adjustments		(203)
Reductions		0
Balance at end of period	$ 52,134	$ 52,134

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Publisher FASB
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 350
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-Section 50
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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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