Product warranties

6 Months Ended

Jun. 30, 2012

Product Warranties Disclosures [Abstract]

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					Six Months Ended
	June 30, 2012			July 2, 2011		June 30, 2012		July 2, 2011
Balance at beginning of period	$	32,680		36,437		30,144		37,265
Warranty claims paid during the period	(14,866		)	(17,012	)	(28,786	)	(30,747	)
Pre-existing warranty accrual adjustment during the period	—			489		—		3,484
Warranty expense during the period	17,053			12,138		33,509		22,050
Balance at end of period	$	34,867		32,052		34,867		32,052