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Commitments and Contingencies Warranty Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Warranty Liabilities [Roll Forward]    
Balance at beginning of year $ 10,389 $ 9,320
Additions charged to costs and expenses for current-year sales 5,003 6,106
Deductions from reserves (5,591) (5,790)
Changes in liability for pre-existing warranties during the current year, including expirations 1,418 132
Balance at end of period $ 11,219 $ 9,768