Warranty Reserves (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Warranty reserve activity
Balance beginning of period	$ 10,451	$ 10,625	$ 11,003	$ 10,412
Provision charged to income	4,160	4,063	12,673	12,960
Payments	(4,113)	(4,304)	(12,781)	(13,344)
Adjustments to previously provided warranties, net	268	221	(54)	708
Foreign currency translation and acquisitions	122	154	47	23
Balance end of period	$ 10,888	$ 10,759	$ 10,888	$ 10,759