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Product Warranties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Change in accrued warranty expense
Beginning balance	$ 453	$ 462	$ 431	$ 455
Provision	147	67	211	211
Payments	(15)	(42)	(57)	(179)
Ending balance	$ 585	$ 487	$ 585	$ 487

- 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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