Product Warranties (Tables)

9 Months Ended

Sep. 30, 2012

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability

A reconciliation of the changes in the Company's warranty reserve is as follows:

	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2012			2011			2012			2011
Balance at the beginning of the period	$	776		$	724		$	983		$	605
Warranty expenses accrued	34			435			645			1,142
Warranty settlements made	(217		)	(369		)	(1,035		)	(957		)
Balance at the end of the period	$	593		$	790		$	593		$	790