Warranties (Tables)

9 Months Ended

Sep. 29, 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						Nine Months Ended
	September 29, 2018			September 30, 2017			September 29, 2018			September 30, 2017
Balance as of beginning of period	$	4,906		$	4,602		$	4,863		$	3,838
Accruals for warranties issued during    period		1,020			1,020			3,915			3,800
Settlements during the period		(1,668	)		(1,080	)		(4,520	)		(3,096	)
Balance as of end of period	$	4,258		$	4,542		$	4,258		$	4,542