Goodwill and Other Intangibles (Tables)

3 Months Ended

Mar. 31, 2013

Goodwill and Other Intangibles [Abstract]

Components of other intangibles

	March 31, 2013						December 31, 2012
	Gross				Net		Gross				Net
	Carrying		Accumulated		Carrying		Carrying		Accumulated		Carrying
	Value		Amortization		Value		Value		Amortization		Value
	(in thousands)
Patents	$	5,116	$	1,479	$	3,637	$	5,108	$	1,339	$	3,769
Trademarks and technology licenses		1,158		844		314		1,157		821		336
Customer relationships		1,764		1,064		700		1,757		1,001		756
Other intangible assets		671		357		314		673		343		330
Total identifiable intangible assets	$	8,709	$	3,744	$	4,965	$	8,695	$	3,504	$	5,191

Amortization expense included in general and administrative expense

	Three months ended March 31,
	2013		2012
	(in thousands)
Amortization expense	$	262	$	241

Estimated amortization expense for the remainder of 2013 and each of the five succeeding fiscal years

	2013		2014		2015		2016		2017		2018
	(in thousands)
Amortization expense	$	939	$	930	$	665	$	569	$	319	$	226