Warranty Costs (Tables)

9 Months Ended

Sep. 30, 2012

Warranty Costs [Abstract]

Product Warranty Liability

During the nine and three months ended September 30, 2012 and 2011 changes in the warranty reserve consisted of the following:

	Nine Months						Three Months
	2012			2011			2012			2011
Accrued warranty reserve, beginning of period	$	537		$	477		$	540		$	422
Estimated warranty expense		526			335			207			164
Amounts charged against warranty reserve		(458	)		(331	)		(142	)		(105	)
Accrued warranty reserve, end of period	$	605		$	481		$	605		$	481