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Commitments and Contingencies (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Summary of warranty accrual included in accrued liabilities
Balance at beginning of period	$ 5,133	$ 5,263	$ 5,558	$ 4,811
Accrual for current period warranties	1,474	2,171	3,093	4,433
Warranty costs incurred	(1,882)	(1,856)	(3,926)	(3,666)
Balance at end of period	$ 4,725	$ 5,578	$ 4,725	$ 5,578

- 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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