Product Warranty (Tables)

9 Months Ended

Sep. 30, 2013

Product Warranty

Schedule of standard product warranty

	Nine months ended September 30,
	2013			2012
	(in thousands)
Balance at January 1 (beginning of year)	$	1,801		$	3,697
Warranties issued during the period	1,401			2,170
Settlements made during the period	(1,107		)	(2,550		)
Changes in estimate of liability for pre-existing warranties during the period	(586		)	(1,155		)
Balance at September 30 (end of period)	$	1,509		$	2,162
Amount classified as current	$	1,461		$	2,107
Amount classified as long-term	48			55
Total warranty liability	$	1,509		$	2,162