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OTHER INTANGIBLE ASSETS, NET
 6 Months Ended
Jun. 30, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
OTHER INTANGIBLE ASSETS, NET
OTHER INTANGIBLE ASSETS, NET
 
The following tables present the cumulative composition of the Corporation’s intangible assets:
 
 
June 30, 2017
 
December 31, 2016
(In thousands)
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Technology
 
$
240,858

 
$
(105,400
)
 
$
135,458

 
$
166,859

 
$
(98,266
)
 
$
68,593

Customer related intangibles
 
363,500

 
(168,351
)
 
195,149

 
349,742

 
(157,154
)
 
192,588

Other intangible assets
 
40,250

 
(24,866
)
 
15,384

 
36,709

 
(26,429
)
 
10,280

Total
 
$
644,608

 
$
(298,617
)
 
$
345,991

 
$
553,310

 
$
(281,849
)
 
$
271,461

 
 
 
 
 
 
 
 
 
 
 
 
 

During the six months ended June 30, 2017, the Corporation acquired intangible assets of $88.9 million. The Corporation acquired Technology of $73.0 million, Customer related intangibles of $12.9 million, and Other intangible assets of $3.0 million, which have a weighted average amortization period of 15.0 years, 16.3 years, and 7.0 years, respectively.

Total intangible amortization expense for the six months ended June 30, 2017 was $19.1 million as compared to $16.8 million in the prior year period.  The estimated amortization expense for the five years ending December 31, 2017 through 2021 is $38.7 million, $37.7 million, $36.0 million, $34.1 million, and $32.3 million, respectively.