Product Warranty (Tables)

9 Months Ended

Sep. 30, 2017

Product Warranty

Schedule of product warranty liability

	Nine months ended
	September 30,
	2017		2016
	(in thousands)
Balance at January 1 (beginning of year)	$	2,666	$	3,555
Warranties issued during the period		3,898		2,286
Settlements made during the period		(1,614)		(3,570)
Changes in estimate of liability for pre-existing warranties during the period		(562)		551
Balance at September 30 (end of period)	$	4,388	$	2,822
Amount classified as current	$	4,154	$	2,597
Amount classified as long-term		234		225
Total warranty liability	$	4,388	$	2,822