PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Net Defined Benefit Pension and Other Postretirement Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	$ 1,938	$ 2,026	$ 5,815	$ 6,078
Estimated return on plan assets	(1,671)	(1,593)	(5,013)	(4,780)
Settlement loss	357	0	3,629	0
Amortization of net loss	179	14	536	42
Net costs	803	447	4,967	1,340
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	16	20	50	60
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	$ 16	$ 20	$ 50	$ 60