Product Warranty (Tables)

6 Months Ended

Jun. 30, 2020

Product Warranty

Schedule of product warranty liability

	Six months ended
	June 30,
	2020		2019
	(in thousands)
Balance at January 1 (beginning of year)	$	3,244	$	5,091
Warranties issued during the period		2,635		1,693
Settlements made during the period		(1,913)		(2,900)
Changes in estimate of liability for pre-existing warranties during the period		177		399
Balance at June 30 (end of period)	$	4,143	$	4,283
Amount classified as current	$	3,942	$	4,045
Amount classified as long-term		201		238
Total warranty liability	$	4,143	$	4,283