DEFINED BENEFIT PENSION PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Net periodic benefit costs
Service cost	$ 721	$ 589
Interest cost on benefit obligations	165	185
Expected return on plan assets	(52)	(57)
Amortization of net loss	63	27
Total	$ 897	$ 744