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Commitments and Contingencies (FX Contract Details) (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 29, 2013
Mar. 30, 2012
Foreign Currency Cash Flow Hedges [Abstract]    
Increase (reduction) in Cost of Sales $ (172) $ 78
Ineffective portion of change in fair value 0 0
Fx Contract 1 [Member]
    
Derivative [Line Items]    
Derivative, Type of Instrument FX Contract  
Derivative, Hedge Designation Cash flow  
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives 4,500  
Start Date Jan. 01, 2013  
End Date Dec. 31, 2013  
$/Peso 0.0727  
Fair Value 455  
Balance Sheet Location Current Assets  
Fx Contract 2 [Member]
    
Derivative [Line Items]    
Derivative, Type of Instrument FX Contract  
Derivative, Hedge Designation Cash flow  
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives 4,500  
Start Date Jan. 01, 2013  
End Date Dec. 31, 2013  
$/Peso 0.0693  
Fair Value $ 704  
Balance Sheet Location Current Assets