Product warranties (Tables)

6 Months Ended

Jun. 29, 2013

Product Warranties Disclosures [Abstract]

Provision for warranty obligations

The activity related to warranty obligations is as follows:

	Three Months Ended					Six Months Ended
	June 29, 2013			June 30, 2012		June 29, 2013		June 30, 2012
Balance at beginning of period	$	35,483		32,680		32,930		30,144
Warranty claims paid during the period	(16,306		)	(14,866	)	(29,607	)	(28,786	)
Acquisitions	503			—		3,283		—
Warranty expense during the period	13,994			17,053		27,068		33,509
Balance at end of period	$	33,674		34,867		33,674		34,867