Restructuring - Accrued Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Cash paid	$ (500)	$ (800)
Technical Nonwovens
Restructuring Reserve [Roll Forward]
Balance		333
Pre-tax restructuring expenses, excluding depreciation		1,307
Cash paid		(770)	$ (3,500)
Balance	$ 870	$ 870	$ 333