Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Apr. 30, 2017
Restructuring Cost and Reserve [Line Items]
Cash paid	$ 500		$ 800
Technical Nonwovens
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax restructuring expense	5,000		5,000
Restructuring, expected costs resulting in future cash expenditures						$ 4,800
Cash paid			770	$ 3,500
Pre-tax restructuring expenses, excluding depreciation			1,300
Technical Nonwovens | Selling, Product Development and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses, excluding depreciation	$ 900		1,400
Technical Nonwovens | Cost of Sales
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses, excluding depreciation			$ 100
Forecast | Technical Nonwovens
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses, excluding depreciation		$ 1,300			$ 2,800