Product Warranty (Tables)

12 Months Ended

Dec. 31, 2015

Product Warranty

Schedule of standard product warranty liability

	Years Ended December 31,
	2015			2014			2013
	(in thousands)
Balance at January 1 (beginning of year)	$	1,526		$	1,428		$	1,801
Warranties issued during the period		4,305			1,743			2,240
Settlements made during the period		(2,672	)		(2,096	)		(1,515	)
Changes in estimate of liability for pre-existing warranties during the period		396			451			(1,098	)
Balance at December 31 (end of year)	$	3,555		$	1,526		$	1,428
Amount classified as current	$	3,363		$	1,352		$	1,316
Amount classified within other long-term liabilities		192			174			112
Total warranty liability	$	3,555		$	1,526		$	1,428