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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 30, 2017
Product Warranty Accrual [Roll Forward]      
Balance at beginning of period $ 15,388 $ 15,250  
Accruals for warranties issued during period 5,992 5,540  
Adjustments related to pre-existing warranties 68 (116)  
Settlements made during the period (6,010) (5,548)  
Balance at end of period 15,438 $ 15,126  
Current - in the next twelve months 9,512   $ 9,524
Long-term - beyond one year $ 5,926   $ 5,864