Product warranties (Tables)

6 Months Ended

Jun. 28, 2014

Product Warranties Disclosures [Abstract]

Provision for warranty obligations

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