Goodwill and Long-Lived Assets - Changes in Carrying Amount of Goodwill by Reporting Unit (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning Balance		$ 196,963	$ 68,969
Goodwill addition		(662)	131,509
Goodwill impairment	$ (63,000)	(63,000)
Currency translation adjustment		611	(3,515)
Ending Balance	133,912	133,912	196,963
Performance Materials
Goodwill [Roll Forward]
Beginning Balance		144,626	13,307
Goodwill addition		(662)	131,509
Goodwill impairment	(63,000)	(63,000)
Currency translation adjustment		(306)	(190)
Ending Balance	80,658	80,658	144,626
Technical Nonwovens
Goodwill [Roll Forward]
Beginning Balance		52,337	55,662
Goodwill addition		0	0
Goodwill impairment	0	0
Currency translation adjustment		917	(3,325)
Ending Balance	$ 53,254	$ 53,254	$ 52,337