Segment Information - Classification of Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating Income	$ (38,825)	$ 49,188	$ 66,200
Total Assets	785,937	872,686	560,871
Capital Expenditures	36,433	29,630	24,915
Depreciation and Amortization	48,623	32,731	25,939
Operating Segments | Performance Materials Segment
Segment Reporting Information [Line Items]
Operating Income	(59,804)	13,139	12,321
Total Assets	325,164	414,211	72,837
Capital Expenditures	8,914	11,288	3,610
Depreciation and Amortization	25,118	9,006	3,996
Operating Segments | Technical Nonwovens Segment
Segment Reporting Information [Line Items]
Operating Income	22,895	21,323	26,047
Total Assets	242,787	242,007	271,713
Capital Expenditures	9,345	5,864	2,903
Depreciation and Amortization	12,702	13,877	12,625
Operating Segments | Thermal Acoustical Solutions Segment
Segment Reporting Information [Line Items]
Operating Income	23,590	38,085	53,132
Total Assets	199,218	201,509	189,301
Capital Expenditures	17,858	11,934	17,462
Depreciation and Amortization	10,168	9,190	8,619
Corporate
Segment Reporting Information [Line Items]
Operating Income	(25,506)	(23,359)	(25,300)
Total Assets	18,768	14,959	27,020
Capital Expenditures	316	544	940
Depreciation and Amortization	$ 635	$ 658	$ 699