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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Employee benefits
Service cost	$ 911	$ 797
Interest cost	1,344	2,355
Expected return on plan assets	(1,983)	(2,981)
Amortization of prior service cost (credit)	(128)	(125)
Amortization of net loss	1,110	1,586
Other adjustments	0	125
Net periodic cost	1,254	1,757
Other Postretirement Benefits Plan
Employee benefits
Net periodic cost	$ 0	$ 0

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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