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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Reconciliation of the changes in the Company's earn-out - cash (Level 3 liabilities) balance    
Balance at the beginning of the period $ 624 $ 652
Payments against earn-out (94) (83)
Change in fair value of earn-out liability 99 19
Balance at the end of the period $ 629 $ 588