Product Warranty (Tables)

6 Months Ended

Jun. 30, 2014

Product Warranty

Schedule of standard product warranty

	Six months ended June 30,
	2014			2013
	(in thousands)
Balance at January 1 (beginning of year)	$	1,428		$	1,801
Warranties issued during the period	832			925
Settlements made during the period	(978		)	(705		)
Changes in estimate of liability for pre-existing warranties during the period	79			(536		)
Balance at June 30 (end of period)	$	1,361		$	1,485
Amount classified as current	$	1,326		$	1,419
Amount classified as long-term	35			66
Total warranty liability	$	1,361		$	1,485