EMPLOYEE BENEFITS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014 item	Jun. 30, 2013
EMPLOYEE BENEFITS
Number of new participants			0
Retirement expense for continuing operations
Net retirement expense	$ 1,157	$ 3,081	$ 2,315	$ 6,081
Pension plan
Retirement expense for continuing operations
Service cost	2,007	1,373	4,015	2,773
Interest cost	22,751	21,173	45,502	42,298
Expected return on plan assets	(26,865)	(25,252)	(53,730)	(50,527)
Prior service cost amortization	3	7	6	7
Actuarial loss	4,002	6,404	8,004	12,779
Net retirement expense	1,898	3,705	3,797	7,330
Post-retirement plans
Retirement expense for continuing operations
Net retirement expense	$ (741)	$ (624)	$ (1,482)	$ (1,249)