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Net Periodic Pension Benefit (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Retirement Benefits [Abstract]
Service cost (1)	$ 0	$ 0
Interest cost on projected benefit obligation	505	723
Expected return on plan assets	(1,140)	(1,210)
Amortization of unrecognized gain	321	263
Net periodic pension benefit	$ (314)	$ (224)

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