Segment Information - Consolidated Net Sales 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, Revenue Reconciling Item [Line Items]
Net sales	$ 197,886	$ 180,041	$ 575,959	$ 520,407
Operating Segments | Performance Materials
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	41,720	29,547	103,647	87,599
Operating Segments | Performance Materials | Filtration
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	22,643	22,263	68,846	65,483
Operating Segments | Performance Materials | Sealing and Advanced Solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	19,077	7,284	34,801	22,116
Operating Segments | Technical Nonwovens
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	73,071	73,306	212,324	199,322
Operating Segments | Technical Nonwovens | Industrial Filtration
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	40,945	38,346	120,346	108,884
Operating Segments | Technical Nonwovens | Advanced Materials
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	32,126	34,960	91,978	90,438
Operating Segments | Thermal Acoustical Solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	88,211	84,376	279,817	255,162
Operating Segments | Thermal Acoustical Solutions | Parts
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	77,723	75,195	248,764	237,657
Operating Segments | Thermal Acoustical Solutions | Tooling
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	10,488	9,181	31,053	17,505
Eliminations and Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ (5,116)	$ (7,188)	$ (19,829)	$ (21,676)