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Goodwill and Acquired Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2019
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by reportable segments for the six months ended June 30, 2019, were as follows:
|  | Industrial Automation |  |  | System Test |  |  | Wireless Test |  |  | Semiconductor Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 363,358 |  |  | $ | 158,699 |  |  | $ | 361,819 |  |  | $ | 260,540 |  |  | $ | 1,144,416 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  |  | 363,358 |  |  |  | 10,516 |  |  |  | 7,976 |  |  |  | — |  |  |  | 381,850 |
Lemsys acquisition |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,428 |  |  |  | 1,428 |
Foreign currency translation adjustment |  |  | 626 |  |  |  | — |  |  |  | — |  |  |  | 32 |  |  |  | 658 |
Balance at June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 363,984 |  |  |  | 158,699 |  |  |  | 361,819 |  |  |  | 262,000 |  |  |  | 1,146,502 |
Accumulated impairment losses |  |  | — |  |  |  | (148,183 | ) |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (762,566 | )
|  | $ | 363,984 |  |  | $ | 10,516 |  |  | $ | 7,976 |  |  | $ | 1,460 |  |  | $ | 383,936 |
Schedule of Estimated Intangible Assets Amortization Expense | Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2019 (remainder) |  |  | 18,745 |
2020 |  |  | 25,037 |
2021 |  |  | 14,778 |
2022 |  |  | 13,885 |
2023 |  |  | 13,410 |
Thereafter |  |  | 23,639 |
Wireless Test |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheet:
|  | June 30, 2019 |
|  | Gross Carrying Amount (1)(2) |  |  | Accumulated Amortization (2) |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 337,198 |  |  | $ | (265,951 | ) |  | $ | (4,035 | ) |  | $ | 67,212 |
Customer relationships |  |  | 100,313 |  |  |  | (87,496 | ) |  |  | (285 | ) |  |  | 12,532 |
Tradenames and trademarks |  |  | 64,670 |  |  |  | (34,131 | ) |  |  | (789 | ) |  |  | 29,750 |
Total intangible assets |  | $ | 502,181 |  |  | $ | (387,578 | ) |  | $ | (5,109 | ) |  | $ | 109,494 |
|  | 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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