Product Warranty (Tables)

3 Months Ended

Mar. 31, 2016

Product Warranty

Schedule of standard product warranty liability

	Three months ended March 31,
	2016			2015
	(in thousands)
Balance at January 1 (beginning of year)	$	3,555		$	1,526
Warranties issued during the period	921			1,080
Settlements made during the period	(1,306		)	(566		)
Changes in estimate of liability for pre-existing warranties during the period	365			123
Balance at March 31 (end of period)	$	3,535		$	2,163
Amount classified as current	$	3,288		$	1,909
Amount classified within other long-term liabilities	247			254
Total warranty liability	$	3,535		$	2,163