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Goodwill and Intangible Assets
9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Intangible Assets

(Dollars in thousands)
September 30, 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
$
2,537

 
$
615

 
$
1,922

 
$
1,046

 
$
364

 
$
682

Technology
47,423

 
18,731

 
28,692

 
33,942

 
15,958

 
17,984

Covenant-not-to-compete
935

 
891

 
44

 
1,016

 
823

 
193

Customer relationships
50,282

 
7,781

 
42,501

 
19,123

 
4,406

 
14,717

Total definite lived intangible assets
101,177

 
28,018

 
73,159

 
55,127

 
21,551

 
33,576

Indefinite lived intangible assets
4,418

 

 
4,418

 
4,764

 

 
4,764

Total intangible assets
$
105,595

 
$
28,018

 
$
77,577

 
$
59,891

 
$
21,551

 
$
38,340


(1) Gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations.
On January 22, 2015, we acquired Arlon. For further detail on the goodwill and intangible assets recorded on the acquisition, see Note 5 - "Acquisition".
Amortization expense for the quarter and nine months ended September 30, 2015 was approximately $2.8 million and $8.0 million, respectively. Amortization expense was $1.5 million and $4.7 million for the quarter and nine months ended September 30, 2014, respectively. The estimated annual future amortization expense is $2.8 million, $10.4 million, $10.0 million, $9.5 million and $9.0 million for the remainder of 2015, 2016, 2017, 2018 and 2019, respectively.
The weighted average amortization period as of September 30, 2015, by intangible asset class, is presented in the table below:

Intangible Asset Class
 
Weighted Average Amortization Period (Years)
Trademarks and patents
 
4.5
Technology
 
5.0
Covenant not-to-compete
 
1.0
Customer relationships
 
6.3
Total definite lived intangible assets
 
5.7

The indefinite-lived trademark intangible assets were acquired from the acquisition of Curamik. These assets are assessed for impairment annually or when changes in circumstances indicated that the carrying values may be recoverable. The definite-lived intangibles are amortized using a fair value methodology that is based on the projected economic use of the related underlying asset.
Goodwill
The changes in the carrying amount of goodwill for the period ending September 30, 2015, by segment, were as follows:

(Dollars in thousands)
Advanced Connectivity Solutions
 
Elastomeric Material Solutions
 
Power Electronics Solutions
 
Other
 
Total
December 31, 2014
$

 
$
23,565

 
$
72,438

 
$
2,224

 
$
98,227

Foreign currency translation adjustment

 
(1,301
)
 
(5,659
)
 

 
(6,960
)
Arlon acquisition
52,444

 
33,893

 

 

 
86,337

September 30, 2015
$
52,444

 
$
56,157

 
$
66,779

 
$
2,224

 
$
177,604