6. Warranties

Liability for warranty expense is included in Other current accrued liabilities and Non-current liabilities in the accompanying Condensed Consolidated Balance Sheets and the activity for the three and six months ended July 3, 2011 and July 4, 2010 was as follows:


	Three months ended						Six months ended
	July 3, 2011			July 4, 2010			July 3, 2011			July 4, 2010
	(In thousands)
Balance, beginning of period	$	21,205		$	30,665		$	24,702		$	25,909
Additions		7,645			1,733			8,204			23,005
Usage		(5,694	)		(6,093	)		(9,750	)		(22,609	)

Balance, end of period	$	23,156		$	26,305		$	23,156		$	26,305

The majority of the Company’s products have a warranty of less than three years with a small number of products having a warranty ranging up to ten years. A provision for the estimated future cost related to warranty expense is recorded at the time of customer invoice. The Company’s warranty liability is affected by customer and consumer returns, product failures, number of units sold, and repair or replacement costs incurred. Should actual product failure rates, or repair or replacement costs differ from the Company’s estimates, increases or decreases to its warranty liability would be required.