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Goodwill and Acquired Intangibles (Details 3) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Estimated amortization expense    
2018 – remaining period $ 39,446  
2018 46,234  
2019 40,619  
2020 36,115  
2021 17,810  
Thereafter 13,203  
Acquired intangibles, net $ 193,427 $ 207,335