Product Warranty (Tables)

9 Months Ended

Sep. 30, 2016

Product Warranty

Schedule of standard product warranty liability

	Nine months ended
	September 30,
	2016		2015
	(in thousands)
Balance at January 1 (beginning of year)	$	3,555	$	1,526
Warranties issued during the period		2,286		3,543
Settlements made during the period		(3,570)		(1,611)
Changes in estimate of liability for pre-existing warranties during the period		551		345
Balance at September 30 (end of period)	$	2,822	$	3,803
Amount classified as current	$	2,597	$	3,532
Amount classified as long-term		225		271
Total warranty liability	$	2,822	$	3,803