Business Segment Information - Segment Assets (Details) - USD ($) $ in Thousands	Oct. 02, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total Assets	$ 837,783	$ 837,347
Total Goodwill and Intangibles	285,814	295,574
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	496,616	448,606
Total Goodwill and Intangibles	194,111	201,077
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	325,165	325,604
Total Goodwill and Intangibles	91,703	94,497
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 16,002	$ 63,137