Business Segment Information - Segment Assets (Details) - USD ($) $ in Thousands	Jul. 03, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total Assets	$ 829,079	$ 837,347
Total Goodwill and Intangibles	289,067	295,574
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	486,124	448,606
Total Goodwill and Intangibles	196,433	201,077
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	324,131	325,604
Total Goodwill and Intangibles	92,634	94,497
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 18,824	$ 63,137