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Stock Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Stock options outstanding, exercisable and expected to vest    
Options outstanding, Number of Shares 1,114,331 1,102,842
Options outstanding, Weighted Average Exercise Price $ 4.39 $ 3.97
Options outstanding, Weighted Average Remaining Contractual Life (years) 3 years 9 months 11 days  
Options outstanding, Aggregate Intrinsic Value $ 4,697   
Options vested and expected to vest, Number of Shares 1,038,459  
Options vested and expected to vest, Weighted Average Exercise Price $ 4.29  
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years) 3 years 7 months 10 days  
Options vested and expected to vest, Aggregate Intrinsic Value 4,478  
Options exercisable, Number of Shares 659,237  
Options exercisable, Weighted Average Exercise Price $ 3.71  
Options exercisable, Weighted Average Remaining Contractual Life (years) 2 years 4 months 10 days  
Options exercisable, Aggregate Intrinsic Value $ 3,218