Restructuring - Actual and Estimated Pre-Tax Expenses (Details) - Technical Nonwovens - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended	21 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2019	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Total estimated expenses						$ 3,740
Total pre-tax expense incurred	$ 376	$ 97	$ 117	$ 2,959	$ 3,549
Estimated remaining expense			191	781	191
Severance and Related Expenses
Restructuring Cost and Reserve [Line Items]
Total estimated expenses						1,000
Total pre-tax expense incurred	16	53	50	787	906
Estimated remaining expense			94	213	94
Contract Termination Expenses
Restructuring Cost and Reserve [Line Items]
Total estimated expenses						290
Total pre-tax expense incurred	0	0	0	290	290
Estimated remaining expense			0	0	0
Facility Exit, Move and Set-up Expenses
Restructuring Cost and Reserve [Line Items]
Total estimated expenses						$ 2,450
Total pre-tax expense incurred	$ 360	$ 44	67	1,882	2,353
Estimated remaining expense			$ 97	$ 568	$ 97