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 nine months ended October 2, 2011 and October 3, 2010 was as follows:



	Three months ended						Nine months ended
	October 2, 2011			October 3, 2010			October 2, 2011			October 3, 2010
	(In thousands)
Balance, beginning of period	$	23,156		$	26,305		$	24,702		$	25,909
Additions	5,689			2,973			13,893			25,978
Usage	(5,310		)	(5,075		)	(15,060		)	(27,684		)
Balance, end of period	$	23,535		$	24,203		$	23,535		$	24,203

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 or more. For 100-year or lifetime warranties, the Company uses the estimated useful life of the product to calculate the warranty exposure. 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