Revenue Changes in Revenue due to Estimates in Over Time Contracts (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Change in Accounting Estimate [Line Items]
Net sales	$ 182,394	$ 177,890	$ 354,010	$ 385,212
Performance obligations satisfied in previous periods [Member]
Change in Accounting Estimate [Line Items]
Reductions in Revenues	$ (3,446)	$ (1,425)	$ (581)	$ (2,540)

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details