Goodwill and Long-Lived Assets - Gross and Net Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill	$ 209,072	$ 209,123
Accumulated amortization/impairment	(75,160)	(12,160)
Currency translation adjustment	(611)	3,515
Goodwill	133,912	196,963	$ 68,969
Performance Materials
Goodwill [Roll Forward]
Goodwill	143,658	144,626
Accumulated amortization/impairment	(63,000)	0
Currency translation adjustment	306	190
Goodwill	80,658	144,626	13,307
Technical Nonwovens
Goodwill [Roll Forward]
Goodwill	53,254	52,337
Accumulated amortization/impairment	0	0
Currency translation adjustment	(917)	3,325
Goodwill	53,254	52,337	$ 55,662
Thermal Acoustical Solutions
Goodwill [Roll Forward]
Goodwill	12,160	12,160
Accumulated amortization/impairment	(12,160)	(12,160)
Goodwill	$ 0	$ 0

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.

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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.

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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

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-Publisher FASB
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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

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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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