Restructuring - Accrued Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Cash paid	$ 100
Technical Nonwovens
Restructuring Reserve [Roll Forward]
Balance	293	$ 0
Pre-tax restructuring expenses	71	293	$ 400
Cash paid	(54)	0	100
Balance	$ 310	$ 293	$ 310