EMPLOYEE BENEFITS (Details ) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 item	Mar. 25, 2012
EMPLOYEE BENEFITS
Number of new participants	0
Retirement expense for continuing operations
Total retirement expense-net	$ 3,000	$ 225
Pension plan
Retirement expense for continuing operations
Service Cost	1,400	1,375
Interest Cost	21,125	22,900
Expected return on plan assets	(25,275)	(26,975)
Actuarial loss	6,375	3,075
Total retirement expense-net	3,625	375
Post-retirement plans
Retirement expense for continuing operations
Total retirement expense-net	$ (625)	$ (150)