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Product Warranty (Narrative) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]
Product Warranties Disclosures [Abstract]
Product warranty liability	$ 915	$ 1,006
Standard Product Warranty Period [Line Items]
Standard product warranty period			90 days	3 years

- 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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