PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Net Defined Benefit Pension and Other Postretirement Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 13	$ 20	$ 25
Interest cost	1,989	2,028	3,977	4,057
Estimated return on plan assets	(1,350)	(1,436)	(2,699)	(2,871)
Amortization of net loss (gain)	251	416	501	831
Net costs	900	1,021	1,799	2,042
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	19	23	39	47
Estimated return on plan assets
Amortization of net loss (gain)		(1)		(1)
Net costs	$ 19	$ 22	$ 39	$ 46