Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Goodwill [Roll Forward]
Balance at beginning of period	$ 133,912		$ 133,912
Currency translation adjustments			144
Impairment	(48,671)		(48,671)
Balance at end of period		$ 133,912	85,385
Performance Materials
Goodwill [Roll Forward]
Balance at beginning of period	80,658		80,658
Currency translation adjustments			(22)
Impairment	(48,671)	(63,000)	(48,671)
Balance at end of period	31,900	80,658	31,965
Technical Nonwovens
Goodwill [Roll Forward]
Balance at beginning of period	53,254		53,254
Currency translation adjustments			166
Impairment	$ 0		0
Balance at end of period		$ 53,254	$ 53,420