SEGMENT INFORMATION - Summary (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 227,099	$ 200,527
Operating income	12,139	(55,568)
Impairment of goodwill and other long-lived assets	0	61,109
Operating Segments | Performance Materials
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	79,333	65,220
Operating income	15,296	(56,941)
Impairment of goodwill and other long-lived assets		61,100
Amortization of intangible assets	3,000	4,000
Operating Segments | Performance Materials | Filtration Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	34,346	25,887
Operating Segments | Performance Materials | Sealing and Advanced Solutions Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	44,987	39,333
Operating Segments | Performance Materials | Advanced Materials
Segment Reporting, Revenue Reconciling Item [Line Items]
Intercompany sales	1,000	900
Operating Segments | Technical Nonwovens
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	61,675	57,403
Operating income	5,104	3,813
Amortization of intangible assets	1,100	1,200
Operating Segments | Technical Nonwovens | Industrial Filtration Products
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	36,401	31,369
Operating Segments | Technical Nonwovens | Advanced Materials
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	25,274	26,034
Intercompany sales	3,900	5,000
Operating Segments | Thermal Acoustical Solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	91,044	83,761
Operating income	1,674	5,628
Operating Segments | Thermal Acoustical Solutions | Parts
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	86,494	77,321
Operating Segments | Thermal Acoustical Solutions | Tooling
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	4,550	6,440
Eliminations and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	(4,953)	(5,857)
Corporate Office Expenses
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating income	$ (9,935)	$ (8,068)