Product warranties (Tables)

9 Months Ended

Sep. 28, 2013

Product Warranties Disclosures [Abstract]

Provision for warranty obligations

The activity related to warranty obligations is as follows:

	Three Months Ended					Nine Months Ended
	September 28, 2013			September 29, 2012		September 28, 2013		September 29, 2012
Balance at beginning of period	$	33,674		34,867		32,930		30,144
Warranty claims paid during the period	(12,144		)	(15,166	)	(41,751	)	(43,952	)
Acquisitions	48			—		3,331		—
Warranty expense during the period	11,989			14,748		39,057		48,257
Balance at end of period	$	33,567		34,449		33,567		34,449