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Intangible Assets
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets, substantially all of which were acquired in the acquisition of TIW and OPT, consist of the following:
 
Estimated Useful Lives
June 30, 2018
 
Gross Book Value
Accumulated Amortization
Foreign Currency Translation
Net Book Value
 
 
(In thousands)
Trademarks
indefinite
$
8,197

$
—

$
(64
)
$
8,133

Patents
15 - 30 years
5,950

(1,174
)
(22
)
4,754

Customer relationships
5 - 15 years
25,924

(2,720
)
(36
)
23,168

Non-compete agreements
3 years
171

(86
)
—

85

 
$
40,242

$
(3,980
)
$
(122
)
$
36,140

 
Estimated Useful Lives
December 31, 2017
 
Gross Book Value
Accumulated Amortization
Foreign Currency Translation
Net Book Value
 
 
(In thousands)
Trademarks
indefinite
$
8,416

$
—

$
56

$
8,472

Patents
15 - 30 years
5,946

(968
)
80

5,058

Customer relationships
5 - 15 years
26,503

(1,675
)
(64
)
24,764

Non-compete agreements
3 years
171

(57
)
—

114

 
$
41,036

$
(2,700
)
$
72

$
38,408

Amortization expense for each of the three and six months ended June 30, 2018 was $0.5 million and $1.2 million, respectively, compared to the three and six months ended June 30, 2017 of $0.5 million and $1.2 million, respectively.