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Stock-Based Compensation Stock-Based Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 24, 2012
Jun. 30, 2013
Jun. 24, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated Share-based Compensation Expense $ 447 $ 516 $ 986 $ 1,001
Income tax benefit (100) (89) (228) (180)
Total stock-based compensation expense after income taxes 347 427 758 821
Cost of Sales [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated Share-based Compensation Expense 59 46 118 138
Selling, General and Administrative Expenses [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated Share-based Compensation Expense $ 388 $ 470 $ 868 $ 863