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Significant Customer (Details Textual) (USD $)
3 Months Ended
Mar. 29, 2013
Mar. 30, 2012
Dec. 31, 2012
Significant Customer (Textual) [Abstract]      
Company's Accounts receivable $ 74,916,000   $ 70,459,000
Share of other customers in Company's revenue 10.00% 10.00%  
IBM [Member]
     
Significant Customer (Textual) [Abstract]      
Revenue 28,900,000 28,400,000  
Revenue percentage 26.70% 27.40%  
Company's Accounts receivable 11,800,000 14,300,000  
Revenue [Member]
     
Significant Customer (Textual) [Abstract]      
Revenue from sale of major customer's business segment   1,100,000