PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Net Defined Benefit Pension and Other Postretirement Costs) (Details) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	$ 1,938	$ 2,026
Estimated return on plan assets	(1,671)	(1,593)
Settlement loss	3,062	0
Amortization of net loss	179	14
Net costs	3,508	447
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Interest cost	17	20
Estimated return on plan assets	0	0
Settlement loss	0	0
Amortization of net loss	0	0
Net costs	$ 17	$ 20