SEGMENT INFORMATION - Net Sales By Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 764,041	$ 837,398	$ 785,897
Operating Segments | Performance Materials Segment
Segment Reporting Information [Line Items]
Net sales	264,645	245,480	169,217
Operating Segments | Performance Materials Segment | Filtration Products
Segment Reporting Information [Line Items]
Net sales	119,969	93,314	93,089
Operating Segments | Performance Materials Segment | Sealing and Advanced Solutions Products
Segment Reporting Information [Line Items]
Net sales	144,676	152,166	76,128
Operating Segments | Technical Nonwovens Segment
Segment Reporting Information [Line Items]
Net sales	222,340	255,346	277,071
Operating Segments | Technical Nonwovens Segment | Industrial Filtration Products
Segment Reporting Information [Line Items]
Net sales	119,367	144,320	157,606
Operating Segments | Technical Nonwovens Segment | Advanced Materials
Segment Reporting Information [Line Items]
Net sales	102,973	111,026	119,465
Operating Segments | Thermal Acoustical Solutions Segment
Segment Reporting Information [Line Items]
Net sales	294,807	361,577	365,427
Operating Segments | Thermal Acoustical Solutions Segment | Parts
Segment Reporting Information [Line Items]
Net sales	272,414	326,436	328,057
Operating Segments | Thermal Acoustical Solutions Segment | Tooling
Segment Reporting Information [Line Items]
Net sales	22,393	35,141	37,370
Eliminations and Other
Segment Reporting Information [Line Items]
Net sales	$ (17,751)	$ (25,005)	$ (25,818)