Product Warranty (Tables)

9 Months Ended

Sep. 30, 2014

Product Warranty

Schedule of standard product warranty

	Nine months ended September 30,
	2014			2013
	(in thousands)
Balance at January 1 (beginning of year)	$	1,428		$	1,801
Warranties issued during the period	1,028			1,401
Settlements made during the period	(1,511		)	(1,107		)
Changes in estimate of liability for pre-existing warranties during the period	264			(586		)
Balance at September 30 (end of period)	1,209			$	1,509
Amount classified as current	1,160			$	1,461
Amount classified as long-term	49			48
Total warranty liability	$	1,209		$	1,509