Product warranties (Tables)

9 Months Ended

Sep. 27, 2014

Product Warranties Disclosures [Abstract]

Provision for warranty obligations

The activity related to warranty obligations is as follows:

	Three Months Ended					Nine Months Ended
	September 27, 2014			September 28, 2013		September 27, 2014		September 28, 2013
Balance at beginning of period	$	32,236		33,674		35,818		32,930
Warranty claims paid during the period	(11,720		)	(12,144	)	(41,606	)	(41,751	)
Acquisitions	—			48		—		3,331
Warranty expense during the period	10,487			11,989		36,791		39,057
Balance at end of period	$	31,003		33,567		31,003		33,567