Restructuring - Accrued Restructuring Costs (Details) - Technical Nonwovens - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses, excluding depreciation		$ 767	$ 2,012
Cash paid	$ (3,800)	(806)	(2,198)
Restructuring reserve		$ 108	$ 147	$ 333