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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in carrying amounts of goodwill by segment | The following table reflects the changes in carrying amounts of goodwill by segment for the six months ended June 30, 2017:
(In thousands) |  | Harsco Metals & Minerals Segment |  | Harsco Industrial Segment |  | Harsco Rail Segment |  | Consolidated Totals
Balance at December 31, 2016 |  | $ | 362,386 |  |  | $ | 6,839 |  |  | $ | 13,026 |  |  | $ | 382,251 |
Foreign currency translation |  | 11,553 |  |  | — |  |  | — |  |  | 11,553 |
Balance at June 30, 2017 |  | $ | 373,939 |  |  | $ | 6,839 |  |  | $ | 13,026 |  |  | $ | 393,804 |
Schedule of intangible assets by class | Intangible assets included in the caption, Intangible assets, net, on the Condensed Consolidated Balance Sheets consist of the following:
|  | June 30, 2017 |  | December 31, 2016
(In thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Customer related |  | $ | 150,373 |  |  | $ | 117,365 |  |  | $ | 146,840 |  |  | $ | 112,610 |
Patents |  | 5,783 |  |  | 5,649 |  |  | 5,729 |  |  | 5,534 |
Technology related |  | 25,918 |  |  | 25,907 |  |  | 25,687 |  |  | 25,634 |
Trade names |  | 8,312 |  |  | 4,687 |  |  | 8,306 |  |  | 4,529 |
Other |  | 8,709 |  |  | 5,515 |  |  | 8,512 |  |  | 5,200 |
Total |  | $ | 199,095 |  |  | $ | 159,123 |  |  | $ | 195,074 |  |  | $ | 153,507 |
Schedule of amortization expense | Amortization expense for intangible assets was as follows:
|  | Three Months Ended |  | Six Months Ended
|  | June 30 |  | June 30
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Amortization expense for intangible assets |  | $ | 1,280 |  |  | $ | 2,050 |  |  | $ | 2,598 |  |  | $ | 4,155 |
Schedule of estimated amortization expense | The estimated amortization expense for the next five fiscal years based on current intangible assets is as follows:
(In thousands) |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021
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.

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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