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Net Periodic Pension Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost on projected benefit obligation	505	723	1,515	2,169
Expected return on plan assets	(1,140)	(1,210)	(3,420)	(3,630)
Amortization of unrecognized gain	321	263	963	789
Net periodic pension benefit	$ (314)	$ (224)	$ (942)	$ (672)

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