Product warranties

6 Months Ended

Jun. 28, 2014

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 28, 2014			June 29, 2013		June 28, 2014		June 29, 2013
Balance at beginning of period	$	33,260		35,483		35,818		32,930
Warranty claims paid during the period	(15,862		)	(16,306	)	(29,886	)	(29,607	)
Acquisitions	—			503		—		3,283
Warranty expense during the period	14,837			13,994		26,303		27,068
Balance at end of period	$	32,235		33,674		32,235		33,674