Restructuring - Accrued Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Cash paid	$ (200)	$ (500)
Technical Nonwovens
Restructuring Reserve [Roll Forward]
Balance		147
Pre-tax restructuring expenses, excluding depreciation		473
Cash paid		(534)	$ (3,800)
Balance	$ 86	$ 86