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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Employee benefits
Service cost	$ 797	$ 701	$ 2,392	$ 2,088
Interest cost	2,355	2,902	7,064	8,652
Expected return on plan assets	(2,981)	(3,236)	(8,944)	(9,706)
Amortization of prior service cost (credit)	(125)	92	(376)	274
Amortization of net loss	1,586	489	4,758	1,466
Other adjustments	125	0	375	0
Net periodic cost	1,757	948	5,269	2,774
Other Postretirement Benefits Plan
Employee benefits
Net periodic cost	$ 0	$ 0	$ 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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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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