Business Segments, Geographic and Customer Information (Reportable Segments) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 29, 2019 facility	Mar. 29, 2019 segment	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 facility	Dec. 31, 2018 USD ($)	Dec. 31, 2018 segment	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments	3	3	2	4		4
Net sales			$ 337,897		$ 367,959		$ 382,096
Industrial
Segment Reporting Information [Line Items]
Net sales			201,517		207,637		200,284
Engineered Components
Segment Reporting Information [Line Items]
Net sales			136,380		160,322		159,129
Fiber Solutions
Segment Reporting Information [Line Items]
Net sales			$ 0		$ 0		$ 22,683