Restructuring (Schedule of Restructuring Charges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring expenses, net
Restructuring expenses, net	$ 15,570	$ 13,491	$ 8,488
Machine Clothing [Member]
Restructuring expenses, net
Restructuring expenses, net	12,278	3,429	6,181
Engineered Composites [Member]
Restructuring expenses, net
Restructuring expenses, net	3,048	10,062	2,314
Termination and Other Costs [Member]
Restructuring expenses, net
Restructuring expenses, net	13,420	7,949	7,251
Termination and Other Costs [Member] | Machine Clothing [Member]
Restructuring expenses, net
Restructuring expenses, net	11,890	2,945	5,756
Termination and Other Costs [Member] | Engineered Composites [Member]
Restructuring expenses, net
Restructuring expenses, net	1,286	5,004	1,502
Impairment of Plant and Equipment [Member]
Restructuring expenses, net
Restructuring expenses, net	2,150	5,542	1,237
Impairment of Plant and Equipment [Member] | Machine Clothing [Member]
Restructuring expenses, net
Restructuring expenses, net	388	484	425
Impairment of Plant and Equipment [Member] | Engineered Composites [Member]
Restructuring expenses, net
Restructuring expenses, net	1,762	5,058	812
Corporate Expenses [Member]
Restructuring expenses, net
Restructuring expenses, net	244		(7)
Corporate Expenses [Member] | Termination and Other Costs [Member]
Restructuring expenses, net
Restructuring expenses, net	244		(7)
Corporate Expenses [Member] | Impairment of Plant and Equipment [Member]
Restructuring expenses, net
Restructuring expenses, net