Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

(Dollars in thousands)	December 31, 2013						December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks and patents	$	1,075	$	303	$	772	$	1,066	$	227	$	839
Technology	37,825		13,340		$	24,485	36,479		8,394		28,085
Covenant-not-to-compete	1,056		628		$	428	1,042		358		684
Customer relationships	21,280		3,235		$	18,045	20,529		2,066		18,463
Total other intangible assets	$	61,236	$	17,506	$	43,730	$	59,116	$	11,045	$	48,071

Weighted average amortization period, by intangible asset class

The weighted average amortization period as of December 31, 2013, by intangible asset class, is presented in the table below:

Intangible Asset Class	Weighted Average Amortization Period
Trademarks and patents	6.9
Technology	4.0
Covenant not-to-compete	1.5
Customer relationships	6.9
Total other intangible assets	5.2

Changes in the carrying amount of goodwill, by segment

The changes in the carrying amount of goodwill for the period ending December 31, 2013, by reportable segment, are as follows:

(Dollars in thousands)	High Performance Foams		Printed Circuit Materials		Power Electronics Solutions		Other		Total
December 31, 2012	$	23,973	$	—	$	78,844	$	2,224	$	105,041
Foreign currency translation adjustment	232		—		3,398		—		3,630
December 31, 2013	$	24,205	$	—	$	82,242	$	2,224	$	108,671