Product warranties

3 Months Ended

Mar. 30, 2013

Product Warranties Disclosures [Abstract]

Product warranties

Product warranties

The Company warrants certain qualitative attributes of its products for up to 50 years. The Company records a provision for estimated warranty and related costs in accrued expenses, based on historical experience, and periodically adjusts these provisions to reflect actual experience.

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