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Accrued Expenses (Activity Related to Warranties) (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 03, 2020
Mar. 29, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning warranty liability $ 5,649 $ 6,433
Charge to cost of sales 1,054 575
Fair value of warranty assumed in acquisition 3,158 0
Costs incurred (1,142) (1,268)
Ending warranty liability $ 8,719 $ 5,740