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PURCHASED INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
PURCHASED INTANGIBLE ASSETS
PURCHASED INTANGIBLE ASSETS
 
The following table presents details of our purchased intangible assets, other than goodwill, as of September 30, 2017:
 
Gross
 
Accumulated
Amortization
 
Net
Core technology
$
19,831

 
$
(9,924
)
 
$
9,907

Customer relationships
39,028

 
(34,955
)
 
4,073

Trademarks / Trade names
2,133

 
(2,133
)
 
—

 
 
 
 
 
 
Total intangible assets
$
60,992

 
$
(47,012
)
 
$
13,980

 
The following table presents details of our purchased intangible assets, other than goodwill, as of December 31, 2016:
 
Gross
 
Accumulated
Amortization
 
Net
Core technology
$
17,751

 
$
(8,165
)
 
$
9,586

Customer relationships
36,088

 
(29,965
)
 
6,123

Trademarks / Trade names
1,903

 
(1,785
)
 
118

 
 
 
 
 
 
Total intangible assets
$
55,742

 
$
(39,915
)
 
$
15,827


 
The change in the gross value of our purchased intangible assets from December 31, 2016 to September 30, 2017 was due to foreign currency translation and an adjustment due to recognition of tax benefit of tax amortization previously applied to certain goodwill related to the DynaEnergetics reporting unit. After the goodwill was written off at December 31, 2015, the tax amortization reduces other noncurrent intangible assets related to the historical acquisition.