Product Warranty (Tables)

3 Months Ended

Mar. 31, 2015

Product Warranty

Schedule of product warranty liability

	Three months ended March 31,
	2015			2014
	(in thousands)
Balance at January 1 (beginning of year)	$	1,526		$	1,428
Warranties issued during the period	1,080			647
Settlements made during the period	(566		)	(467		)
Changes in estimate of liability for pre-existing warranties during the period	123			12
Balance at March 31 (end of period)	$	2,163		$	1,620
Amount classified as current	$	1,909		$	1,496
Amount classified within other long-term liabilities	254			124
Total warranty liability	$	2,163		$	1,620