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INTANGIBLE ASSETS AND GOODWILL INTANGIBLE ASSETS (Notes)
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS AND GOODWILL
INTANGIBLE ASSETS AND GOODWILL

Amortizing identifiable intangible assets related to our acquisitions or capitalized costs of internally developed or externally purchased software that form the basis for our products consisted of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
 
 Gross
 
Accumulated Amortization
 
 Net
 
 Gross
 
Accumulated Amortization
 
Net
Completed technologies and patents
$
58,311

 
$
(58,311
)
 
$
—

 
$
58,246

 
$
(54,508
)
 
$
3,738

Customer relationships
54,790

 
(54,790
)
 
—

 
54,986

 
(54,292
)
 
694

Trade names
1,346

 
(1,346
)
 
—

 
1,346

 
(1,346
)
 
—

Capitalized software costs
4,911

 
(4,911
)
 
—

 
4,911

 
(4,911
)
 
—

Total
$
119,358

 
$
(119,358
)
 
$
—

 
$
119,489

 
$
(115,057
)
 
$
4,432

Amortization expense related to intangible assets in the aggregate was $2.1 million and $2.3 million for the three months ended June 30, 2019 and 2018, respectively, and $4.4 million and $4.6 million for the six months ended June 30, 2019 and 2018, respectively. As of June 30, 2019, intangible assets are fully amortized.

The acquisition of Orad in 2015 resulted in goodwill of $32.6 million as of June 30, 2019 and December 31, 2018.