Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

(Dollars in thousands)	December 31, 2014						December 31, 2013
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks and patents	$	1,046	$	364	$	682	$	1,075	$	303	$	772
Technology	33,942		15,958		17,984		37,825		13,340		24,485
Covenant-not-to-compete	1,016		823		193		1,056		628		428
Customer relationships	19,123		4,406		14,717		21,280		3,235		18,045
Total other intangible assets	$	55,127	$	21,551	$	33,576	$	61,236	$	17,506	$	43,730

Weighted average amortization period, by intangible asset class

The weighted average amortization period as of December 31, 2014, by intangible asset class, is presented in the table below:

Intangible Asset Class	Weighted Average Amortization Period
Trademarks and patents	7.6
Technology	4.7
Covenant not-to-compete	2.0
Customer relationships	7.4
Total other intangible assets	5.9

Changes in the carrying amount of goodwill, by segment

The changes in the carrying amount of goodwill for the period ending December 31, 2014, by reportable segment, were as follows:

(Dollars in thousands)	High Performance Foams			Printed Circuit Materials		Power Electronics Solutions			Other		Total
December 31, 2013	$	24,205		$	—	$	82,242		$	2,224	$	108,671
Foreign currency translation adjustment	(640		)	—		(9,804		)	—		(10,444		)
December 31, 2014	$	23,565		$	—	$	72,438		$	2,224	$	98,227