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Guarantees (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Movement in Standard Product Warranty Accrual [Roll Forward]
Standard warranty period	1 year
Beginning balance	$ 3,363	$ 3,383	$ 3,341
Provision for warranties	4,344	3,510	3,638
Claims made	(4,089)	(3,530)	(3,596)
Ending balance	$ 3,618	$ 3,363	$ 3,383

- 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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