PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - NARRATIVE (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Remeasurement, Basis Spread on Discount Rate (Basis Points)			0.0069
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			5.30%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 248	$ 272	$ 1,005	$ 1,170
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 3,976	$ 3,986	$ 7,328	$ 7,749