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Guarantees (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Guarantees [Abstract]
Standard warranty period	1 year
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 3,618	$ 3,363
Provision for warranties	3,136	3,537
Claims made	(3,093)	(3,273)
Ending balance	$ 3,661	$ 3,627

- 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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