Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Definite Lived Intangible Assets

(Dollars in thousands)
March 31, 2015
 
December 31, 2014
 
Gross Carrying Amount (1)
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount (1)
 
Accumulated Amortization
 
Net Carrying Amount
Trademarks and patents
$
2,583

 
$
432

 
$
2,151

 
$
1,046

 
$
364

 
$
682

Technology
46,481

 
15,639

 
30,842

 
33,942

 
15,958

 
17,984

Covenant-not-to-compete
999

 
856

 
143

 
1,016

 
823

 
193

Customer relationships
50,026

 
5,179

 
44,847

 
19,123

 
4,406

 
14,717

Total definite lived intangible assets
$
100,089

 
$
22,106

 
$
77,983

 
$
55,127

 
$
21,551

 
$
33,576
Weighted Average Amortization Period, by Intangible Asset Class
The weighted average amortization period as of March 31, 2015, by intangible asset class, is presented in the table below:

Intangible Asset Class
 
Weighted Average Amortization Period
Trademarks and patents
 
4.2
Technology
 
4.7
Covenant not-to-compete
 
1.0
Customer relationships
 
6.1
Total other intangible assets
 
5.5
Changes in the Carrying Amount of Goodwill, by Segment
The changes in the carrying amount of goodwill for the period ending March 31, 2015, by segment, was as follows:

(Dollars in thousands)
Printed Circuit Materials
 
High Performance Foams
 
Power Electronics Solutions
 
Other
 
Total
December 31, 2014
$
—

 
$
23,565

 
$
72,438

 
$
2,224

 
$
98,227

Foreign currency translation adjustment
—

 
(275
)
 
(8,322
)
 
—

 
(8,597
)
Arlon acquisition
51,862

 
33,517

 
—

 
—

 
85,379

March 31, 2015
$
51,862

 
$
56,807

 
$
64,116

 
$
2,224

 
$
175,009