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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 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 three months ended March 31, 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

Foreign currency translation
 
4,948

 

 

 
4,948

Balance at March 31, 2018
 
$
386,841

 
$
6,839

 
$
13,026

 
$
406,706


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 March 31, 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:
 
 
March 31, 2018
 
December 31, 2017
(In thousands)
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Gross Carrying
Amount
 
Accumulated
Amortization
Customer related
 
$
154,949

 
$
123,676

 
$
153,014

 
$
121,385

Patents
 
5,874

 
5,752

 
5,825

 
5,700

Technology related
 
26,035

 
26,035

 
26,131

 
26,131

Trade names
 
8,316

 
4,921

 
8,317

 
4,845

Other
 
8,966

 
6,000

 
8,875

 
5,850

Total
 
$
204,140

 
$
166,384

 
$
202,162

 
$
163,911



Amortization expense for intangible assets was as follows:
 
 
Three Months Ended
 
 
March 31
(In thousands)
 
2018
 
2017
Amortization expense for intangible assets
 
$
1,282

 
$
1,318



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 (a)
 
$
5,000

 
$
4,750

 
$
4,500

 
$
4,250

 
$
4,000


(a) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange fluctuations.