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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in 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 June 30, 2019 and December 31, 2018, were as follows:
As of June 30, 2019 (in thousands) | Weighted average amortization life in years | Gross carrying amount | Accumulated amortization | Net carrying amount
Amortized intangible assets: |  |  |  |
AEC trade names | 15 | $140 | $(131) | $9
AEC technology | 15 | 370 | (327) | 43
Customer relationships | 15 | 48,421 | (10,497) | 37,924
Customer contracts | 6 | 17,471 | (9,471) | 8,000
Other intangibles | 5 | 322 | (209) | 113
Net amortized intangible assets |  | $66,724 | $(20,635) | $46,089
Unamortized intangible assets: |  |  |  |
MC Goodwill |  | $68,353 | $— | $68,353
AEC Goodwill |  | 95,730 | — | 95,730
Total unamortized intangible assets: |  | $164,083 | $— | $164,083
As of December 31, 2018 (in thousands) | Weighted average amortization life in years | Gross carrying amount | Accumulated amortization | Net carrying amount
Amortized intangible assets: |  |  |  |
AEC trade names | 15 | $140 | $(129) | $11
AEC technology | 15 | 370 | (314) | 56
Customer relationships | 15 | 48,421 | (8,883) | 39,538
Customer contracts | 6 | 17,471 | (8,015) | 9,456
Other intangibles | 5 | 322 | (177) | 145
Net amortized intangible assets |  | $66,724 | $(17,518) | $49,206
Unamortized intangible assets: |  |  |  |
MC Goodwill |  | $68,652 | $— | $68,652
AEC Goodwill |  | 95,730 | — | 95,730
Total unamortized intangible assets: |  | $164,382 | $— | $164,382
23 Index The changes in intangible assets, net and goodwill from December 31, 2018 to June 30, 2019, were as follows:
(in thousands) | December 31, 2018 | Amortization | Currency Translation | June 30, 2019
Amortized intangible assets: |  |  |  |
AEC trade names | $11 | $(2) | $— | $9
AEC technology | 56 | (13) | — | 43
Customer relationships | 39,538 | (1,614) | — | 37,924
Customer contracts | 9,456 | (1,456) | — | 8,000
Other intangibles | 145 | (32) | — | 113
Net amortized intangible assets | $49,206 | $(3,117) | $— | $46,089
Unamortized intangible assets: |  |  |  |
MC Goodwill | $68,652 | $— | $(299) | $68,353
AEC Goodwill | 95,730 | — | — | 95,730
Total unamortized intangible assets: | $164,382 | $— | $(299) | $164,083
Schedule of Estimated Amortization Expense | Estimated amortization expense of intangibles for the years ending December 31, 2019 through 2023, is as follows:
| Annual amortization
Year | (in thousands)
2019 | $6,234
2020 | 6,234
2021 | 6,163
2022 | 3,949
2023 | 3,228

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