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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2016
Apr. 03, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total share based compensation $ 1,912 $ 1,825
Cost of Sales [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total share based compensation 1,315 1,309
Selling General and Administrative [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total share based compensation $ 597 $ 515