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OTHER INTANGIBLE ASSETS, NET
 9 Months Ended
Sep. 30, 2018
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:
 
 
September 30, 2018
 
December 31, 2017
(In thousands)
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Technology
 
$
240,105

 
$
(121,105
)
 
$
119,000

 
$
243,440

 
$
(114,036
)
 
$
129,404

Customer related intangibles
 
361,776

 
(190,337
)
 
171,439

 
367,230

 
(180,580
)
 
186,650

Programs (1)
 
144,000

 
(3,600
)
 
140,400

 
—

 
—

 
—

Other intangible assets
 
40,675

 
(29,219
)
 
11,456

 
40,640

 
(27,026
)
 
13,614

Total
 
$
786,556

 
$
(344,261
)
 
$
442,295

 
$
651,310

 
$
(321,642
)
 
$
329,668

 
 
 
 
 
 
 
 
 
 
 
 
 

(1) Programs include values assigned to major programs of acquired businesses and represent the aggregate value associated with the customer relationships, contracts, technology, and trademarks underlying the associated program. 

During the nine months ended September 30, 2018, the Corporation acquired intangible assets of $146.1 million. The Corporation acquired Programs of $144.0 million, Customer-related intangibles of $1.8 million, and Other intangible assets of $0.3 million, which have a weighted average amortization period of 20.0 years, 10.4 years, and 8.0 years, respectively.

Total intangible amortization expense for the nine months ended September 30, 2018 was $32.5 million as compared to $28.8 million in the comparable prior year period.  The estimated amortization expense for the five years ending December 31, 2018 through 2022 is $43.7 million, $43.7 million, $41.8 million, $40 million, and $37.5 million, respectively.