Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

The following table sets forth information with respect to goodwill and other intangible assets:

	December 31
In thousands		2016			2015
Goodwill – Composite Fibers	$	73,094		$	76,056
Specialty Papers
Customer relationships	$	6,155		$	6,155
Composite Fibers
Tradename		4,195			4,332
Technology and related		35,874			37,625
Customer relationships and related		32,310			33,618
Advanced Airlaid Materials
Technology and related		1,377			1,403
Customer relationships and related		2,638			2,725
Total intangibles		82,549			85,858
Accumulated amortization		(26,290	)		(22,801	)
Net intangibles	$	56,259		$	63,057

Summary of Amortization of Intangible Assets

amortized over periods ranging from 14 years to 20 years. The following table sets forth information pertaining to amortization of intangible assets:

In thousands			2016		2015		2014
Aggregate amortization    expense:		$	4,852	$	5,340	$	6,136
Estimated amortization    expense:
	2017		4,464
	2018		4,464
	2019		4,464
	2020		4,336
	2021		3,973