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Intangible Assets Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (balance of year) $ 5,091  
2019 3,748  
2020 3,598  
2021 3,345  
2022 2,173  
Thereafter 11,498  
Intangible assets, net $ 29,453 $ 27,123