Product Warranty (Tables)

6 Months Ended

Jun. 30, 2017

Product Warranty

Schedule of product warranty liability

	Six months ended
	June 30,
	2017		2016
	(in thousands)
Balance at January 1 (beginning of year)	$	2,666	$	3,555
Warranties issued during the period		2,577		1,551
Settlements made during the period		(1,090)		(2,399)
Changes in estimate of liability for pre-existing warranties during the period		(281)		520
Balance at June 30, (end of period)	$	3,872	$	3,227
Amount classified as current	$	3,537	$	2,958
Amount classified as long-term		335		269
Total warranty liability	$	3,872	$	3,227