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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
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 nine months ended September 30, 2021:
(In thousands) |  | Harsco Environmental Segment |  | Harsco Clean Earth Segment |  | Harsco Rail Segment |  | Consolidated Totals
Balance at December 31, 2020 |  | $ | 406,401 |  |  | $ | 482,647 |  |  | $ | 13,026 |  |  | $ | 902,074 |
Changes to goodwill (a) |  | — |  |  | 1,232 |  |  | — |  |  | 1,232 |
Foreign currency translation |  | (6,578) |  |  | — |  |  | — |  |  | (6,578) |
Balance at September 30, 2021 |  | $ | 399,823 |  |  | $ | 483,879 |  |  | $ | 13,026 |  |  | $ | 896,728 |
(a) The changes to goodwill relate to the measurement period adjustments for the ESOL acquisition in the Harsco Clean Earth Segment. See Note 3, Acquisitions and Dispositions.
Schedule of intangible assets by class | Intangible assets, net, on the Company's Condensed Consolidated Balance Sheets consist of the following:
|  | September 30, 2021 |  | December 31, 2020
(In thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Customer related |  | $ | 108,226 |  |  | $ | 53,757 |  |  | $ | 109,378 |  |  | $ | 48,057 |
Permits |  | 308,998 |  |  | 30,856 |  |  | 308,705 |  |  | 18,955 |
Technology related |  | 39,604 |  |  | 12,363 |  |  | 40,274 |  |  | 9,654 |
Trade names |  | 31,876 |  |  | 6,797 |  |  | 31,949 |  |  | 4,834 |
Air rights |  | 26,139 |  |  | 1,561 |  |  | 26,139 |  |  | 1,044 |
Patents |  | 185 |  |  | 140 |  |  | 192 |  |  | 139 |
Non-compete Agreement |  | 2,500 |  |  | 937 |  |  | 2,500 |  |  | 469 |
Other |  | 3,896 |  |  | 1,475 |  |  | 3,911 |  |  | 1,331 |
Total |  | $ | 521,424 |  |  | $ | 107,886 |  |  | $ | 523,048 |  |  | $ | 84,483 |
Schedule of amortization expense | Amortization expense for intangible assets was as follows:
|  | Three Months Ended |  | Nine Months Ended
|  | September 30 |  | September 30
(In thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Amortization expense for intangible assets |  | $ | 8,115 |  |  | $ | 8,272 |  |  | $ | 24,514 |  |  | $ | 22,542 |
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) |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025
Estimated amortization expense (b) |  | $ | 32,900 |  |  | $ | 32,400 |  |  | $ | 32,300 |  |  | $ | 31,800 |  |  | $ | 31,600 |
(b) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange fluctuations

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