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OTHER INTANGIBLE ASSETS, NET
 3 Months Ended
Mar. 31, 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:
(In thousands)
 
March 31, 2017
 
December 31, 2016
 
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Technology
 
$
239,311

 
$
(100,541
)
 
$
138,770

 
$
166,859

 
$
(98,266
)
 
$
68,593

Customer related intangibles
 
358,962

 
(161,105
)
 
197,857

 
349,742

 
(157,154
)
 
192,588

Other intangible assets
 
39,826

 
(23,577
)
 
16,249

 
36,709

 
(26,429
)
 
10,280

Total
 
$
638,099

 
$
(285,223
)
 
$
352,876

 
$
553,310

 
$
(281,849
)
 
$
271,461



During the three months ended March 31, 2017, the Corporation acquired intangible assets of $89.9 million. The Corporation acquired Technology of $74.0 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 three months ended March 31, 2017 was $9.6 million as compared to $8.4 million in the comparable prior year period.  The estimated amortization expense for the five years ending December 31, 2017 through 2021 is $38.4 million, $37.4 million, $35.6 million, $33.7 million, and $32.0 million, respectively.