Product Warranty (Tables)

12 Months Ended

Dec. 31, 2014

Product Warranty

Schedule of product warranty liability

	Years Ended December 31,
	2014			2013			2012
	(in thousands)
Balance at January 1 (beginning of year)	$	1,428		$	1,801		$	3,697
Warranties issued during the period		1,743			2,240			3,042
Settlements made during the period		(2,096	)		(1,515	)		(3,010	)
Changes in estimate of liability for pre-existing warranties during the period		451			(1,098	)		(1,928	)
Balance at December 31 (end of year)	$	1,526		$	1,428		$	1,801
Amount classified as current	$	1,352		$	1,316		$	1,700
Amount classified within other long-term liabilities		174			112			101
Total warranty liability	$	1,526		$	1,428		$	1,801