PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011
Pension Plans, Defined Benefit [Member]
Service cost	$ 13	$ 47	$ 25	$ 99
Interest cost	2,028	2,211	4,057	4,676
Estimated return on plan assets	(1,436)	(1,665)	(2,871)	(3,521)
Amortization of prior service cost	0	1	0	2
Amortization of net loss (gain)	416	26	831	54
Net periodic benefit cost	1,021	620	2,042	1,310
Other Pension Plans, Defined Benefit [Member]
Service cost	0	0	0	0
Interest cost	23	30	47	64
Estimated return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of net loss (gain)	(1)	0	(1)	0
Net periodic benefit cost	$ 22	$ 30	$ 46	$ 64