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Commitments and Contingencies Warranty Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Warranty Liabilities [Roll Forward]    
Balance at beginning of year $ 10,389 $ 9,320
Additions charged to costs and expenses for current-year sales 8,033 9,275
Deductions from reserves (8,159) (8,461)
Changes in liability for pre-existing warranties during the current year, including expirations 1,189 177
Balance at end of period $ 11,452 $ 10,311