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Goodwill and Intangible Assets (Estimated Future Amortization of Intangible Assets) (Details)
$ in Thousands
Apr. 01, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 (remaining nine months) $ 20,254
2019 24,603
2020 20,543
2021 17,309
2022 $ 13,832