Product Warranty Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Standard Product Warranty Accrual Rollforward
Balance at the beginning of the period	$ 85,397	$ 88,901	$ 85,112	$ 89,940
Provision for warranties issued and changes in estimates for pre-existing warranties	1,556	1,513	4,413	4,220
Claims paid	(1,739)	(1,689)	(4,950)	(4,752)
Foreign currency translation	(158)	(449)	481	(1,132)
Balance at the end of the period	$ 85,056	$ 88,276	$ 85,056	$ 88,276