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Intangible Assets - Schedule of annual expected amortization expense of acquired intangible assets (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 19,419  
2019 16,619  
2020 7,504  
2021 5,148  
2022 2,352  
Thereafter 266  
Total $ 51,308 $ 96,522