SEGMENT INFORMATION - Classification of Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Consolidated Operating (Loss) Income	$ (62,065)	$ (38,825)	$ 49,188
Total Assets	775,462	785,937	872,686
Capital Expenditures	33,368	36,433	29,630
Depreciation and Amortization	53,957	48,623	32,731
Operating Segments | Performance Materials Segment
Segment Reporting Information [Line Items]
Consolidated Operating (Loss) Income	(46,044)	(59,804)	13,139
Total Assets	265,107	325,164	414,211
Capital Expenditures	19,185	8,914	11,288
Depreciation and Amortization	29,110	25,118	9,006
Operating Segments | Technical Nonwovens Segment
Segment Reporting Information [Line Items]
Consolidated Operating (Loss) Income	18,599	22,895	21,323
Total Assets	245,094	242,787	242,007
Capital Expenditures	5,651	9,345	5,864
Depreciation and Amortization	11,460	12,702	13,877
Operating Segments | Thermal Acoustical Solutions Segment
Segment Reporting Information [Line Items]
Consolidated Operating (Loss) Income	(871)	23,590	38,085
Total Assets	215,562	199,218	201,509
Capital Expenditures	7,553	17,858	11,934
Depreciation and Amortization	12,704	10,168	9,190
Corporate
Segment Reporting Information [Line Items]
Consolidated Operating (Loss) Income	(33,749)	(25,506)	(23,359)
Total Assets	49,699	18,768	14,959
Capital Expenditures	979	316	544
Depreciation and Amortization	$ 683	$ 635	$ 658