DEFINED BENEFIT PLANS - Periodic Benefits Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11	$ 11	$ 34	$ 32
Interest cost	802	974	2,405	2,922
Expected return on assets	(1,398)	(1,234)	(4,193)	(3,701)
Amortization of prior service cost	16	15	47	43
Amortization of net actuarial loss	753	704	2,256	2,112
Net periodic benefit cost	184	470	549	1,408
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	6	13	17
Interest cost	59	66	178	197
Amortization of net actuarial loss	27	0	81	0
Net periodic benefit cost	$ 90	$ 72	$ 272	$ 214