Segment Information - Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	$ 9,733	$ 15,354	$ 36,018	$ 50,540
Technical Nonwovens
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intercompany revenue	4,300	6,500	17,200	19,500
Operating Segments | Performance Materials (1)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	1,753	3,133	8,043	8,725
Operating Segments | Technical Nonwovens
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	6,271	8,589	17,395	19,792
Operating Segments | Thermal Acoustical Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	7,923	10,607	29,357	40,798
Corporate Office Expenses
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated Operating Income	$ (6,214)	(6,975)	$ (18,777)	(18,775)
Accounting Standards Update 2017-07
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other expense, net		$ 200		$ 600