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Goodwill and Acquired Intangibles (Details 3) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Estimated amortization expense    
2017 – remaining period $ 41,615  
2018 52,267  
2019 45,250  
2020 40,039  
2021 35,546  
Thereafter 29,728  
Acquired intangibles, net $ 244,445 $ 258,814