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Intangible Assets
 9 Months Ended
Sep. 30, 2017
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, 2017
 
December 31, 2016
 
Gross Book Value
Accumulated Amortization
Net Book Value
 
Gross Book Value
Accumulated Amortization
Net Book Value
 
 
 
(In thousands)
Trademarks
indefinite
 
$
8,474

$
—

$
8,474

 
$
8,416

$
—

$
8,416

Patents
15 - 30 years
 
5,955

(745
)
5,210

 
3,583

(294
)
3,289

Customer relationships
5 - 15 years
 
26,737

(1,531
)
25,206

 
18,057

(168
)
17,889

Noncompete Agreements
3 years
 
171

(42
)
129

 
—

—

—

 
 
 
$
41,337

$
(2,318
)
$
39,019

 
$
30,056

$
(462
)
$
29,594


Amortization expense for the three and nine months ended September 30, 2017, was $0.6 million and $1.8 million, respectively.