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Goodwill And Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2019 and 2018 are as follows:
|  | Industrial Automation |  |  | Wireless Test |  |  | Semiconductor Test |  |  | System Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 233,519 |  |  | $ | 361,819 |  |  | $ | 260,540 |  |  | $ | 158,699 |  |  | $ | 1,014,577 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
|  |  | 233,519 |  |  |  | 7,976 |  |  |  | — |  |  |  | 10,516 |  |  |  | 252,011 |
MiR acquisition |  |  | 135,976 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 135,976 |
Energid acquisition |  |  | 14,394 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14,394 |
Foreign currency translation adjustment |  |  | (20,531 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (20,531 | )
Balance at December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 363,358 |  |  |  | 361,819 |  |  |  | 260,540 |  |  |  | 158,699 |  |  |  | 1,144,416 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
|  |  | 363,358 |  |  |  | 7,976 |  |  |  | — |  |  |  | 10,516 |  |  |  | 381,850 |
Lemsys acquisition |  |  | — |  |  |  | — |  |  |  | 1,428 |  |  |  | — |  |  |  | 1,428 |
Auto G uide acquisition |  |  | 41,372 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 41,372 |
Foreign currency translation adjustment |  |  | (8,247 | ) |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | (8,219 | )
Balance at December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 396,483 |  |  |  | 361,819 |  |  |  | 261,996 |  |  |  | 158,699 |  |  |  | 1,178,997 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
|  | $ | 396,483 |  |  | $ | 7,976 |  |  | $ | 1,456 |  |  | $ | 10,516 |  |  | $ | 416,431 |
Schedule of Estimated Intangible Assets Amortization Expense | Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2020 |  | $ | 30,606 |
2021 |  |  | 20,593 |
2022 |  |  | 19,700 |
2023 |  |  | 19,226 |
2024 |  |  | 18,921 |
Thereafter |  |  | 16,434 |
Wireless Test |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets:
|  | December 31, 2019 |
|  | Gross Carrying Amount (1 ) (2) |  |  | Accumulated Amortization (2) |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 361,787 |  |  | $ | (279,000 | ) |  | $ | (5,709 | ) |  | $ | 77,078 |
Customer relationships |  |  | 75,669 |  |  |  | (59,077 | ) |  |  | (455 | ) |  |  | 16,137 |
Tradenames and trademarks |  |  | 70,120 |  |  |  | (36,671 | ) |  |  | (1,184 | ) |  |  | 32,265 |
Backlog |  |  | 260 |  |  |  | (260 | ) |  |  | — |  |  |  | — |
Total intangible assets |  | $ | 507,836 |  |  | $ | (375,008 | ) |  | $ | (7,348 | ) |  | $ | 125,480 |
|  | December 31, 2018 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 336,308 |  |  | $ | (252,080 | ) |  | $ | (4,079 | ) |  | $ | 80,149 |
Customer relationships |  |  | 97,153 |  |  |  | (83,448 | ) |  |  | (340 | ) |  |  | 13,365 |
Tradenames and trademarks |  |  | 64,420 |  |  |  | (31,653 | ) |  |  | (799 | ) |  |  | 31,968 |
Non-compete agreement |  |  | 320 |  |  |  | (320 | ) |  |  | — |  |  |  | — |
Backlog |  |  | 30 |  |  |  | (30 | ) |  |  | — |  |  |  | — |
Total intangible assets |  | $ | 498,231 |  |  | $ | (367,531 | ) |  | $ | (5,218 | ) |  | $ | 125,482 |

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