EMPLOYEE BENEFITS (Details ) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013 item	Jun. 24, 2012
EMPLOYEE BENEFITS
Number of new participants			0
Retirement expense for continuing operations
Total retirement expense-net	$ 3,081	$ 649	$ 6,081	$ 874
Pension plan
Retirement expense for continuing operations
Service cost	1,373	1,395	2,773	2,770
Interest cost	21,173	23,049	42,298	45,949
Expected return on plan assets	(25,252)	(26,905)	(50,527)	(53,880)
Prior service cost amortization	7	7	7	7
Actuarial loss	6,404	3,268	12,779	6,343
Total retirement expense-net	3,705	814	7,330	1,189
Post-retirement plans
Retirement expense for continuing operations
Total retirement expense-net	$ (624)	$ (165)	$ (1,249)	$ (315)