Revenue Changes in Revenue due to Estimates in Over Time Contracts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Change in Accounting Estimate [Line Items]
Net sales	$ 179,836	$ 213,959	$ 533,846	$ 599,171
Performance obligations satisfied in previous periods [Member]
Change in Accounting Estimate [Line Items]
Reductions in Revenues	$ (937)	$ (2,798)	$ (1,518)	$ (5,338)