Business and Summary of Significant Accounting Policies Warranty Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$ 10,028	$ 5,824	$ 4,153
Additions charged to costs and expenses for current-year sales	9,034	9,368	9,437
Deductions from reserves	(10,016)	(6,486)	(8,118)
Changes in liability for pre-existing warranties during the current year, including expirations	(413)	1,322	352
Balance at end of period	$ 8,633	$ 10,028	$ 5,824