Product Warranty (Tables)

3 Months Ended

Mar. 31, 2013

Product Warranty

Schedule of product warranty

	Three months ended March 31,
	2013			2012
	(in thousands)
Balance at January 1 (beginning of year)	$	1,801		$	3,697
Warranties issued during the period	457			842
Settlements made during the period	(399		)	(1,078		)
Changes in estimate of liability for pre-existing warranties during the period	(277		)	(225		)
Balance at March 31 (end of period)	$	1,582		$	3,236
Amount classified as current	$	1,539		$	3,110
Amount classified as long-term	43			126
Total warranty liability	$	1,582		$	3,236