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Guarantees (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Guarantees [Abstract]
Standard warranty period	1 year
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 3,636	$ 3,618
Provision for warranties	908	1,125
Claims made	(1,113)	(1,047)
Ending balance	$ 3,431	$ 3,696

- 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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