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Goodwill and Acquired Intangibles (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Amortization of acquired intangibles        
Cost of product and maintenance $ 9,925 $ 9,505 $ 31,078 $ 29,773
Amortization of acquired intangibles 2,874 3,470 9,341 10,618
Total amortization of acquired intangibles $ 12,799 $ 12,975 $ 40,419 $ 40,391