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Consolidated Statements of Operations (Parenthetical) (USD $)
3 Months Ended
Mar. 28, 2014
Mar. 29, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total share based compensation $ 1,268,000 $ 1,522,000
Cost of Sales [Member]
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total share based compensation 615,000 823,000
Selling General and Administrative [Member]
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total share based compensation $ 653,000 $ 699,000