Product Warranty (Tables)

12 Months Ended

Dec. 31, 2012

Product Warranty

Schedule of product warranty

	Years Ended December 31,
	2012			2011			2010
	(in thousands)
Balance at January 1 (beginning of year)	$	3,697		$	2,713		$	726
Warranties issued during the period		3,042			4,772			3,722
Settlements made during the period		(3,010	)		(5,275	)		(1,923	)
Changes in estimate of liability for pre-existing warranties during the period		(1,928	)		1,487			188
Balance at December 31 (end of year)	$	1,801		$	3,697		$	2,713
Amount classified as current	$	1,700		$	3,556		$	2,556
Amount classified as long-term		101			141			157
Total Warranty Liability	$	1,801		$	3,697		$	2,713