PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Net Defined Benefit Pension and Other Postretirement Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	$ 1,939	$ 2,026	$ 3,877	$ 4,052
Estimated return on plan assets	(1,671)	(1,594)	(3,342)	(3,187)
Settlement loss	210	0	3,272	0
Amortization of net loss	178	14	357	28
Net costs	656	446	4,164	893
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	17	20	34	40
Estimated return on plan assets	0	0	0	0
Settlement loss	0	0	0	0
Amortization of net loss	0	0	0	0
Net costs	$ 17	$ 20	$ 34	$ 40