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Commitments and Contingencies (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Summary of warranty accrual included in accrued liabilities
Balance at beginning of period	$ 5,558	$ 4,811
Accrual for current period warranties	1,619	2,262
Warranty costs incurred	(2,044)	(1,810)
Balance at end of period	$ 5,133	$ 5,263

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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