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PURCHASED INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
PURCHASED INTANGIBLE ASSETS
PURCHASED INTANGIBLE ASSETS
 
The following table presents details of our purchased intangible assets as of September 30, 2018:
 
Gross
 
Accumulated
Amortization
 
Net
Core technology
$
19,436

 
$
(10,771
)
 
$
8,665

Customer relationships
37,564

 
(36,714
)
 
850

Trademarks / Trade names
2,086

 
(2,086
)
 
—

 
 
 
 
 
 
Total intangible assets
$
59,086

 
$
(49,571
)
 
$
9,515

 
The following table presents details of our purchased intangible assets, other than goodwill, as of December 31, 2017:
 
Gross
 
Accumulated
Amortization
 
Net
Core technology
$
20,027

 
$
(10,333
)
 
$
9,694

Customer relationships
39,244

 
(36,077
)
 
3,167

Trademarks / Trade names
2,149

 
(2,149
)
 
—

 
 
 
 
 
 
Total intangible assets
$
61,420

 
$
(48,559
)
 
$
12,861


 
The change in the gross value of our purchased intangible assets from December 31, 2017 to September 30, 2018 was due to foreign currency translation and an adjustment due to the recognition of tax benefit of tax amortization previously applied to certain goodwill related to the NobelClad and DynaEnergetics reporting units. After the goodwill was written off at September 30, 2017 and December 31, 2015, respectively, the tax amortization reduces other noncurrent intangible assets related to the historical acquisition.