Restructuring - Actual and Estimated Pre-tax Expenses (Details) - Technical Nonwovens - USD ($) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total expenses	$ 767	$ 2,297	$ 662	$ 3,726
Severance and Related Expenses
Restructuring Cost and Reserve [Line Items]
Total expenses	145	606	181	932
Contract Termination Expenses
Restructuring Cost and Reserve [Line Items]
Total expenses	0	136	154	290
Facility Exit, Move and Set-up Expenses
Restructuring Cost and Reserve [Line Items]
Total expenses	$ 622	$ 1,555	$ 327	$ 2,504