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Goodwill and Intangible Assets (Details 2) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Estimated aggregate future amortization expense    
2019 $ 4,285  
2020 3,770  
2021 3,341  
2022 2,897  
2023 2,647  
Thereafter 10,209  
Net Carrying Amount $ 27,149 $ 30,785