Product Warranty (Tables)

3 Months Ended

Mar. 31, 2017

Product Warranty

Schedule of product warranty liability

	Three months ended
	March 31,
	2017		2016
	(in thousands)
Balance at January 1 (beginning of year)	$	2,666	$	3,555
Warranties issued during the period		1,166		921
Settlements made during the period		(454)		(1,306)
Changes in estimate of liability for pre-existing warranties during the period		(254)		365
Balance at March 31 (end of period)	$	3,124	$	3,535
Amount classified as current	$	2,748	$	3,288
Amount classified as long-term		376		247
Total warranty liability	$	3,124	$	3,535