Product warranties (Tables)

3 Months Ended

Mar. 30, 2013

Product Warranties Disclosures [Abstract]

Provision for warranty obligations

The activity related to warranty obligations is as follows:

	Three Months Ended
	March 30, 2013			March 31, 2012
Balance at beginning of period	$	32,930		30,144
Warranty claims paid during the period	(13,301		)	(13,920	)
Warranty expense during the period	15,854			16,456
Balance at end of period	$	35,483		32,680