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Goodwill and Intangible Assets - Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Estimated future amortization expense    
2018 $ 283  
2019 352  
2020 286  
2021 286  
2022 286  
Thereafter 713  
Finite lived intangible assets, Net carrying amount $ 2,206 $ 412