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Intangible Assets
 9 Months Ended
Sep. 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
September 30, 2018
 
Gross Book Value
Accumulated Amortization
Foreign Currency Translation
Net Book Value
 
 
(In thousands)
Trademarks
indefinite
$
8,275

$
—

$
(73
)
$
8,202

Patents
15 - 30 years
5,950

(1,309
)
(32
)
4,609

Customer relationships
5 - 15 years
25,889

(3,101
)
(136
)
22,652

Non-compete agreements
3 years
171

(99
)
—

72

 
$
40,285

$
(4,509
)
$
(241
)
$
35,535

 
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 nine months ended September 30, 2018 was $0.6 million and $1.7 million, respectively, compared to the three and nine months ended September 30, 2017 of $0.6 million and $1.8 million, respectively.