Reportable Segments and Geographic Data (Schedule of Financial Data by Reporting Segment) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 257,700	$ 271,100	$ 273,900	$ 251,400	$ 251,600	$ 251,900	$ 255,400	$ 223,600	$ 226,700	$ 222,100	$ 215,600	$ 199,300	$ 1,054,132	$ 982,479	$ 863,717
Depreciation and amortization													70,795	79,036	71,956
Operating income (loss)													193,576	137,408	78,676
Interest income													(2,729)	(2,118)	(1,511)
Interest expense													19,650	20,242	18,602
Other expense/ (income), net													(1,557)	4,037	6,877
Income before income taxes													178,212	115,247	54,708
Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Net sales														(7,120)
Depreciation and amortization
Operating income (loss)														3,325
Income before income taxes														3,325
Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization													4,250	5,018	4,896
Operating income (loss)													(53,909)	(49,075)	(43,647)
Corporate Expenses [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization
Operating income (loss)
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest income													(2,729)	(2,118)	(1,511)
Interest expense													19,650	20,242	18,602
Other expense/ (income), net													(1,557)	4,037	6,877
Significant Reconciling Items [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Interest income
Interest expense
Other expense/ (income), net
Machine Clothing [Member]
Segment Reporting Information [Line Items]
Net sales													601,254	611,858	590,357
Depreciation and amortization													21,875	30,813	33,527
Operating income (loss)													191,965	169,836	153,980
Machine Clothing [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Net sales														(3,970)
Depreciation and amortization
Operating income (loss)														(1,605)
Engineered Composites [Member]
Segment Reporting Information [Line Items]
Net sales													452,878	370,621	273,360
Depreciation and amortization													44,670	43,205	33,533
Operating income (loss)													$ 55,520	16,647	$ (31,657)
Engineered Composites [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Net sales														(3,150)
Depreciation and amortization
Operating income (loss)														$ 4,930