PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Unrecognized Benefit Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Actuarial loss (gain)	$ 10,234	$ 653	$ 3,511	$ 10,068
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			(536)	(42)
Curtailment and settlement adjustments			(3,629)	0
Actuarial loss (gain)			981	14,908
Asset loss (gain)			8,835	1,232
Net actuarial loss (gain), end of period	49,558	33,055	49,558	33,055
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)			(11)	76
Asset loss (gain)			0	0
Net actuarial loss (gain), end of period	$ (138)	$ (50)	$ (138)	$ (50)