Product warranties (Tables)

9 Months Ended

Sep. 29, 2012

Product Warranties Disclosures [Abstract]

Provision for warranty obligations

The activity related to warranty obligations is as follows:

	Three Months Ended					Nine Months Ended
	September 29, 2012			October 1, 2011		September 29, 2012		October 1, 2011
Balance at beginning of period	$	34,867		32,052		30,144		37,265
Warranty claims paid during the period	(15,166		)	(13,247	)	(43,952	)	(43,994	)
Pre-existing warranty accrual adjustment during the period	—			300		—		3,784
Warranty expense during the period	14,748			10,140		48,257		32,190
Balance at end of period	$	34,449		29,245		34,449		29,245