PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Net Defined Benefit Pension and Other Postretirement Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	$ 1,467	$ 1,366
Estimated return on plan assets	(1,349)	(1,517)
Amortization of net loss	328	301
Net costs	446	150
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	13	12
Estimated return on plan assets	0	0
Amortization of net loss	0	0
Net costs	$ 13	$ 12