Product Warranty (Tables)

6 Months Ended

Jun. 30, 2016

Product Warranty

Schedule of standard product warranty liability

	Six months ended
	June 30,
	2016		2015
	(in thousands)
Balance at January 1 (beginning of year)	$	3,555	$	1,526
Warranties issued during the period		1,551		2,230
Settlements made during the period		(2,399)		(1,020)
Changes in estimate of liability for pre-existing warranties during the period		520		344
Balance at June 30 (end of period)	$	3,227	$	3,080
Amount classified as current	$	2,958	$	2,886
Amount classified as long-term		269		194
Total warranty liability	$	3,227	$	3,080