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Commitments and Contingencies (Minimum Future Estimated Operating Lease Expense) (Details)
$ in Thousands
Dec. 28, 2018
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2018 $ 8,562
2019 7,290
2020 7,348
2021 5,269
2022 5,112
After 2022 $ 14,589