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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Schedule of Intangible Assets and Goodwill |  | We are continuing to amortize certain patents, trade names, customer relationships, customer contracts and technology assets that have finite lives. The gross carrying value, accumulated amortization and net values of intangible assets and goodwill as of September 30, 2020 and December 31, 2019, were as follows:
As of September 30, 2020 | Weighted average amortization life in years | Gross carrying amount | Accumulated amortization | Net carrying amount
(in thousands) |  |  |  |
Amortized intangible assets: |  |  |  |
AEC Trademarks and trade names | 6-15 | $ | 208 |  | $ | (148) |  | $ | 60 |
AEC Technology | 10-15 | 6,522 |  | (871) |  | 5,651 |
AEC Intellectual property | 15 | 1,250 |  | (68) |  | 1,182 |
AEC Customer contracts | 6 | 17,471 |  | (13,110) |  | 4,361 |
AEC Customer relationships | 8-15 | 51,763 |  | (14,768) |  | 36,995 |
AEC Other intangibles | 5 | 322 |  | (290) |  | 32 |
Total amortized intangible assets |  | $ | 77,536 |  | $ | (29,255) |  | $ | 48,281 |
Unamortized intangible assets: |  |  |  |
MC Goodwill |  | $ | 69,884 |  | $ | — |  | $ | 69,884 |
AEC Goodwill |  | 114,403 |  | — |  | 114,403 |
Total unamortized intangible assets: |  | $ | 184,287 |  | $ | — |  | $ | 184,287 |
As of December 31, 2019 | Weighted average amortization life in years | Gross carrying amount | Accumulated amortization | Net carrying amount
(in thousands) |  |  |  |
Amortized intangible assets: |  |  |  |
AEC Trademarks and trade names | 6-15 | $ | 208 |  | $ | (135) |  | $ | 73 |
AEC Technology | 10-15 | 6,191 |  | (387) |  | 5,804 |
AEC Intellectual property | 15 | 1,250 |  | (7) |  | 1,243 |
AEC Customer contracts | 6 | 17,471 |  | (10,927) |  | 6,544 |
AEC Customer relationships | 8-15 | 51,255 |  | (12,108) |  | 39,147 |
AEC Other intangibles | 5 | 322 |  | (241) |  | 81 |
Total amortized intangible assets |  | $ | 76,697 |  | $ | (23,805) |  | $ | 52,892 |
Unamortized intangible assets: |  |  |  |
MC Goodwill |  | $ | 67,672 |  | $ | — |  | $ | 67,672 |
AEC Goodwill |  | 113,262 |  | — |  | 113,262 |
Total unamortized intangible assets: |  | $ | 180,934 |  | $ | — |  | $ | 180,934 |
The changes in intangible assets, net and goodwill from December 31, 2019 to September 30, 2020, were as follows:
(in thousands) | December 31, 2019 | Other Changes | Amortization | Currency Translation | September 30, 2020
Amortized intangible assets: |  |  |  |  |
AEC Trademarks and trade names | $ | 73 |  | $ | — |  | $ | (13) |  | $ | — |  | $ | 60 |
AEC Technology | 5,804 |  | — |  | (480) |  | 327 |  | 5,651 |
AEC Intellectual property | 1,243 |  | — |  | (61) |  | — |  | 1,182 |
AEC Customer contracts | 6,544 |  | — |  | (2,183) |  | — |  | 4,361 |
AEC Customer relationships | 39,147 |  | 329 |  | (2,626) |  | 145 |  | 36,995 |
AEC Other intangibles | 81 |  | — |  | (49) |  | — |  | 32 |
Total amortized intangible assets | $ | 52,892 |  | $ | 329 |  | $ | (5,412) |  | $ | 472 |  | $ | 48,281 |
Unamortized intangible assets: |  |  |  |  |
MC Goodwill | $ | 67,672 |  | $ | — |  | $ | — |  | $ | 2,212 |  | $ | 69,884 |
AEC Goodwill | 113,262 |  | 335 |  | — |  | 806 |  | 114,403 |
Total unamortized intangible assets: | $ | 180,934 |  | $ | 335 |  | $ | — |  | $ | 3,018 |  | $ | 184,287 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated amortization expense of intangibles for the years ending December 31, 2020 through 2024, is as follows:
Year | Annual amortization (in thousands)
2020 | $ | 7,200 |
2021 | 7,100 |
2022 | 4,900 |
2023 | 4,200 |
2024 | 4,200 |

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