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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The following table reflects the changes in carrying amounts of goodwill by segment for the nine months ended September 30, 2018:
(In thousands)
 
Harsco Metals  & Minerals Segment
 
Harsco Industrial Segment
 
Harsco Rail
Segment
 
Consolidated
Totals
Balance at December 31, 2017
 
$
381,893

 
$
6,839

 
$
13,026

 
$
401,758

Changes to goodwill
 
26,737

(a)

 

 
26,737

Foreign currency translation
 
(8,144
)
 

 

 
(8,144
)
Balance at September 30, 2018
 
$
400,486

 
$
6,839

 
$
13,026

 
$
420,351


(a) Changes to goodwill in the Harsco Metals & Minerals Segment relate to the acquisition of Altek. The purchase price allocation is not yet final for this acquisition. See Note 3, Acquisitions.
The Company tests for goodwill impairment annually or more frequently if indicators of impairment exist, or if a decision is made to dispose of a business.  The Company performs the annual goodwill impairment test as of October 1 and monitors for triggering events on an ongoing basis.  The Company determined that, as of September 30, 2018, no interim goodwill impairment testing was necessary. 
Intangible assets included in the caption, Intangible assets, net, on the Condensed Consolidated Balance Sheets consist of the following:
 
 
September 30, 2018
 
December 31, 2017
(In thousands)
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Gross Carrying
Amount
 
Accumulated
Amortization
Customer related (b)
 
$
137,498

 
$
98,834

 
$
153,014

 
$
121,385

Patents
 
2,590

 
2,495

 
5,825

 
5,700

Technology related (b)
 
36,666

 
1,851

 
26,131

 
26,131

Trade names (b)
 
9,311

 
1,754

 
8,317

 
4,845

Other
 
5,856

 
3,389

 
8,875

 
5,850

Total
 
$
191,921

 
$
108,323

 
$
202,162

 
$
163,911


(b) The increase in net Customer related, Technology related and Trade names intangible assets is related to the acquisition of Altek. The purchase price allocation is not yet final for this acquisition. See Note 3, Acquisitions.

Amortization expense for intangible assets was as follows:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30
 
September 30
(In thousands)
 
2018
 
2017
 
2018
 
2017
Amortization expense for intangible assets
 
$
2,395

 
$
1,269

 
$
5,326

 
$
3,868



The estimated amortization expense for the next five fiscal years based on current intangible assets is as follows:
(In thousands)
 
2018
 
2019
 
2020
 
2021
 
2022
Estimated amortization expense (c)
 
$
7,900

 
$
9,750

 
$
9,250

 
$
8,800

 
$
8,500


(c) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange fluctuations and are subject to change pending finalization of the purchase price allocation for Altek.