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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 15,450 $ 15,388
Accruals for warranties issued during period 5,718 5,992
Adjustments related to pre-existing warranties 89 68
Warranty issues resolved during the period (5,746) (6,010)
Balance at end of period $ 15,511 $ 15,438