Segment Information - Operating Income by Segment (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Consolidated Operating Income		$ 14,955	$ 13,679
Operating Segments | Performance Materials
Segment Reporting Information [Line Items]
Consolidated Operating Income		1,589	2,138
Operating Segments | Technical Nonwovens
Segment Reporting Information [Line Items]
Consolidated Operating Income	[1]	4,668	3,926
Operating Segments | Thermal/Acoustical Metals
Segment Reporting Information [Line Items]
Consolidated Operating Income		2,443	3,557
Operating Segments | Thermal/Acoustical Fibers
Segment Reporting Information [Line Items]
Consolidated Operating Income		12,289	10,324
Corporate Office Expenses
Segment Reporting Information [Line Items]
Consolidated Operating Income		$ (6,034)	$ (6,266)

[1] The Technical Nonwovens segment reports results of Texel and Gutsche for the period following the dates of acquisition of July 7, 2016 and December 31, 2016, respectively.