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Goodwill and Acquired Intangibles (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Estimated amortization expense    
2018 – remaining period $ 25,921  
2018 46,222  
2019 40,614  
2020 36,115  
2021 17,810  
Thereafter 13,203  
Acquired intangibles, net $ 179,885 $ 207,335