Product Warranty (Tables)

3 Months Ended

Mar. 31, 2020

Product Warranty

Schedule of product warranty liability

	Three months ended
	March 31,
	2020		2019
	(in thousands)
Balance at January 1 (beginning of year)	$	3,244	$	5,091
Warranties issued during the period		1,385		954
Settlements made during the period		(950)		(1,475)
Changes in estimate of liability for pre-existing warranties during the period		126		89
Balance at March 31  (end of period)	$	3,805	$	4,659
Amount classified as current	$	3,431	$	4,319
Amount classified as long-term		374		340
Total warranty liability	$	3,805	$	4,659