PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Unrecognized Benefit Amounts) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net actuarial loss (gain), beginning of period	$ 43,907	$ 16,957
Amortization	(357)	(28)
Curtailment and settlement adjustments	(3,272)	0
Actuarial loss (gain)	(7,033)	14,864
Asset loss (gain)	(112)	210
Net actuarial loss (gain), end of period	33,133	32,003
Other Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net actuarial loss (gain), beginning of period	(127)	(126)
Amortization	0	0
Curtailment and settlement adjustments	0	0
Actuarial loss (gain)	(26)	79
Asset loss (gain)	0	0
Net actuarial loss (gain), end of period	$ (153)	$ (47)