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Commitments and Contingencies Warranty Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Warranty Liabilities [Roll Forward]    
Balance at beginning of year $ 8,633 $ 10,028
Additions charged to costs and expenses for current-year sales 8,627 7,014
Deductions from reserves (6,625) (7,976)
Changes in liability for pre-existing warranties during the current year, including expirations (708) (976)
Balance at end of period $ 9,927 $ 8,090