Revenue Recognition Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 84,197	$ 120,684	$ 187,272	$ 238,308
Aerospace and Defense [Member]
Disaggregation of Revenue [Line Items]
Revenues	38,129	80,343	99,663	159,184
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	20,213	19,500	41,056	37,656
Medical [Member]
Disaggregation of Revenue [Line Items]
Revenues	13,038	8,973	22,408	18,639
Telecommunications & IT [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,373	6,988	18,378	14,511
Transportation [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 3,444	$ 4,880	$ 5,767	$ 8,318