PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Unrecognized Benefit Amounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018
Pension Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net actuarial loss (gain), beginning of period	$ 54,343	$ 54,235
Amortization	(984)	(902)
Curtailment and settlement adjustments	(3,064)	0
Actuarial loss (gain)	20,726	(9,787)
Asset loss (gain)	(8,590)	2,695
Net actuarial loss (gain), end of period	62,431	46,241
Other Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net actuarial loss (gain), beginning of period	(34)	35
Amortization	0	0
Curtailment and settlement adjustments	0	0
Actuarial loss (gain)	129	(67)
Asset loss (gain)	0	0
Net actuarial loss (gain), end of period	$ 95	$ (32)