Restructuring - Actual and Estimated Pre-tax Expenses (Details) - Technical Nonwovens - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Total estimated expenses	$ 4,200
Expenses incurred	2,297	$ 662
Estimated remaining expense at December 31, 2018	1,241
Severance and Related Expenses
Restructuring Cost and Reserve [Line Items]
Total estimated expenses	1,250
Expenses incurred	606	181
Estimated remaining expense at December 31, 2018	463
Contract Termination Expenses
Restructuring Cost and Reserve [Line Items]
Total estimated expenses	450
Expenses incurred	136	154
Estimated remaining expense at December 31, 2018	160
Facility Exit, Move and Set-up Expenses
Restructuring Cost and Reserve [Line Items]
Total estimated expenses	2,500
Expenses incurred	1,555	$ 327
Estimated remaining expense at December 31, 2018	$ 618