SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2013	Dec. 29, 2012
Short-term Inventories
Raw materials and purchased parts	$ 64,627	$ 65,766
Work in process	18,495	18,075
Finished goods	24,824	24,887
Short-term inventories	107,946	108,728
Long-term Inventories
Raw materials and purchased parts	3,344	4,149
Finished goods	4,354	4,926
Long-term inventories	$ 7,698	$ 9,075