Note 8. Warranties

The Company sells the majority of its products with a 12 months repair or replacement warranty from the date of acceptance or shipment date. The Company provides an accrual for estimated future warranty costs based upon the historical relationship of warranty costs to the cost of products sold. The estimated future warranty obligations related to product sales are recorded in the period in which the related revenue is recognized. The estimated future warranty obligations are affected by the warranty periods, sales volumes, product failure rates, material usage, and labor and replacement costs incurred in correcting a product failure. If actual product failure rates, material usage, labor or replacement costs were to differ from the Company’s estimates, revisions to the estimated warranty obligations would be required. For new product introductions where limited or no historical information exists, the Company may use warranty information from other previous product introductions to guide it in estimating its 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 24, 2016			September 26, 2015			September 24, 2016			September 26, 2015
Balance as of beginning of period	$	4,556		$	3,792		$	4,504		$	2,953
Accruals for warranties issued during period		1,100			2,288			3,529			6,240
Settlements during the period		(1,471	)		(1,789	)		(3,848	)		(4,902	)
Balance as of end of period	$	4,185		$	4,291		$	4,185		$	4,291