Product Warranty (Tables)

3 Months Ended

Mar. 31, 2014

Product Warranty

Schedule of product warranty

	Three months ended March 31,
	2014			2013
	(in thousands)
Balance at January 1 (beginning of year)	$	1,428		$	1,801
Warranties issued during the period	647			457
Settlements made during the period	(467		)	(399		)
Changes in estimate of liability for pre-existing warranties during the period	12			(277		)
Balance at March 31 (end of period)	$	1,620		$	1,582
Amount classified as current	$	1,496		$	1,539
Amount classified as long-term	124			43
Total warranty liability	$	1,620		$	1,582