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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Employee benefits
Service cost	$ 798	$ 757	$ 1,595	$ 1,387
Interest cost	2,354	2,875	4,709	5,750
Expected return on plan assets	(2,982)	(3,235)	(5,963)	(6,470)
Amortization of prior service cost (credit)	(126)	91	(251)	182
Amortization of net loss	1,586	488	3,172	977
Other adjustments	125	0	250	0
Net periodic cost	1,755	976	3,512	1,826
Other Postretirement Benefits Plan
Employee benefits
Net periodic cost	$ 0	$ 0	$ 0	$ 0

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