Warranties (Tables)

3 Months Ended

Mar. 31, 2018

Product Warranties Disclosures [Abstract]

Components of the warranty accrual

Components of the warranty accrual, which were included in the accompanying condensed consolidated balance sheets with other current liabilities, were as follows (in thousands):

	Three Months Ended
	March 31, 2018			April 1, 2017
Balance as of beginning of period	$	4,863		$	3,838
Accruals for warranties issued during period		1,445			1,369
Settlements during the period		(1,665	)		(963	)
Balance as of end of period	$	4,643		$	4,244