Restructuring (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 8,600
Accrued restructuring costs expected to be paid within one year	8,400
Accrued restructuring costs expected to be paid in year two	400
Severance and outplacement costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	9,700
AEC assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 5,800	$ 5,800
Machine Clothing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 1,100