Revenue Recognition Disaggregation of Revenue (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, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue
Net Sales	$ 115,040	$ 115,651	$ 120,684	$ 117,625	$ 120,073	$ 118,859	$ 118,021	$ 113,530	$ 468,999	$ 470,483	$ 422,993
Transportation
Disaggregation of Revenue
Net Sales									299,005	300,124
Industrial
Disaggregation of Revenue
Net Sales									78,369	86,968
Medical
Disaggregation of Revenue
Net Sales									41,901	40,663
Aerospace and Defense
Disaggregation of Revenue
Net Sales									17,155	19,405
Telecommunications & IT
Disaggregation of Revenue
Net Sales									$ 32,569	$ 23,323