Revenue Recognition Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 103,075	$ 117,625
Aerospace and Defense [Member]
Disaggregation of Revenue [Line Items]
Revenues	61,534	78,842
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	20,843	18,156
Medical [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,370	9,666
Telecommunications & IT [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,005	7,523
Transportation [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 2,323	$ 3,438