Warranty Costs (Tables)

3 Months Ended

Mar. 31, 2013

Warranty Costs [Abstract]

Product Warranty Liability

During the three months ended March 31, 2013 and 2012, changes in the warranty reserve consisted of the following:

	Three Months
	2013		2012
Accrued warranty reserve, beginning of period	$	549	$	537
Estimated warranty expense		108		163
Amounts charged against warranty reserve		(204)		(99	)
Accrued warranty reserve, end of period	$	453	$	601