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Commitments and Contingencies Warranty Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Warranty Liabilities [Roll Forward]    
Balance at beginning of year $ 10,028 $ 5,824
Additions charged to costs and expenses for current-year sales 3,585 3,008
Deductions from reserves (3,272) (2,318)
Changes in liability for pre-existing warranties during the current year, including expirations (574) 211
Balance at end of period $ 9,767 $ 6,725