Warranties (Tables)

3 Months Ended

Mar. 30, 2013

Product Warranties Disclosures [Abstract]

Components of the warranty accrual

	Three Months Ended
	March 30, 2013			March 31, 2012
Balance as of beginning of period	$	4,203		$	4,797
Accruals for warranties issued during period	423			1,472
Aggregate changes in liabilities related to preexisting warranties	217			609
Settlements during the period	(1,188		)	(1,955		)
Balance as of end of period	$	3,655		$	4,923