Product Warranty (Tables)

6 Months Ended

Jun. 30, 2019

Product Warranty

Schedule of product warranty liability

	Six months ended
	June 30,
	2019		2018
	(in thousands)
Balance at January 1 (beginning of year)	$	5,091	$	4,502
Warranties issued during the period		1,693		3,124
Settlements made during the period		(2,900)		(2,892)
Changes in estimate of liability for pre-existing warranties during the period		399		411
Balance at June 30 (end of period)	$	4,283	$	5,145
Amount classified as current	$	4,045	$	4,698
Amount classified as long-term		238		447
Total warranty liability	$	4,283	$	5,145