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Intangible Assets Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (balance of year) $ 4,288  
2019 3,787  
2020 3,630  
2021 3,395  
2022 1,848  
Thereafter 11,031  
Intangible assets, net $ 27,979 $ 27,123