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Intangible Assets - Schedule of annual expected amortization expense of acquired intangible assets (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 13,613  
2020 4,499  
2021 2,239  
2022 238  
Thereafter 736  
Total $ 21,325 $ 51,308